From f23a14f389bc28de0481d5bba936033535ad7f2d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:02:25 +0300
Subject: [PATCH 01/14] fix and add typing info

---
 src/Socket_Singleton.py | 49 +++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 26 deletions(-)

diff --git a/src/Socket_Singleton.py b/src/Socket_Singleton.py
index d130c77..3d4a010 100644
--- a/src/Socket_Singleton.py
+++ b/src/Socket_Singleton.py
@@ -45,8 +45,8 @@ def __init__(
         release_threshold: int = 0,
         max_clients: int = 0,
         verbose: bool = False,
-        secret: str = None,
-    ):
+        secret: str | None = None,
+    ) -> None:
         """
         Initialize the singleton instance.
 
@@ -86,7 +86,7 @@ def __init__(
         # Store arguments as tuples - each tuple represents one client's complete argument set
         # Internally, this functions as a queue. See self.arguments() for external access.
         # Note: Host's own arguments are not stored here - only arguments from client processes.
-        self._arguments = []
+        self._arguments: list[tuple[str, ...]] = []
         self._observers = {}
         self._clients = 0
         self._listening = False
@@ -105,13 +105,13 @@ def __init__(
                 self._create_client()
 
             if self.strict:
-                raise SystemExit
-            else:
-                raise MultipleSingletonsError(
-                    "\nApplication is already bound & listening "
-                    f"@ {self.address} on port {self.port}. Multiple "
-                    f"instances are disallowed in the current context."
-                ) from None
+                raise SystemExit from err
+
+            raise MultipleSingletonsError(
+                "\nApplication is already bound & listening "
+                f"@ {self.address} on port {self.port}. Multiple "
+                f"instances are disallowed in the current context."
+            ) from None
 
         else:
             self._listening = True
@@ -122,12 +122,12 @@ def __init__(
             if self.timeout > 0:
                 self._timer.start()
 
-    def __str__(self):
+    def __str__(self) -> str:
         """Human-readable string representation."""
 
         return f"Socket_Singleton(address={self.address!r}, port={self.port})"
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         """
         Unambiguous string representation for developers.
 
@@ -165,7 +165,7 @@ def __exit__(self, ex_type, ex_value, ex_traceback):
         self.release()
         return False
 
-    def _create_server(self):
+    def _create_server(self) -> None:
         """
         Server thread that listens for client connections and processes arguments.
 
@@ -229,9 +229,8 @@ def _create_server(self):
                                     f"Socket_Singleton: Failed to decode data from client "
                                     f"on port {self.port}, skipping arguments"
                                 )
-                            pass
 
-    def _create_client(self):
+    def _create_client(self) -> None:
         """
         Client behavior when port is already bound.
 
@@ -244,7 +243,7 @@ def _create_client(self):
                 sock.connect((self.address, self.port))
                 # Build message: secret (if required) + arguments, joined by null bytes
                 # Use null byte (\x00) as delimiter to avoid issues with newlines
-                parts = []
+                parts: list[str] = []
                 if self.secret is not None:
                     parts.append(self.secret)
                 parts.extend(argv[1:])
@@ -270,9 +269,8 @@ def _create_client(self):
                     f"Socket_Singleton: Failed to connect to existing instance "
                     f"on {self.address}:{self.port} (port may have been released)"
                 )
-            pass
 
-    def _append_args(self, args):
+    def _append_args(self, args: tuple[str, ...]) -> None:
         """
         Append a complete argument set from a client to the queue and notify observers.
         """
@@ -280,7 +278,7 @@ def _append_args(self, args):
         self._arguments.append(args)
         self._update_observers()
 
-    def _update_observers(self):
+    def _update_observers(self) -> None:
         """
         Publish the most recent argument set to all registered observers.
 
@@ -317,9 +315,8 @@ def _update_observers(self):
                         f"Socket_Singleton: Observer {observer_name} "
                         f"raised exception: {type(exc).__name__}: {exc}"
                     )
-                pass
 
-    def trace(self, observer, *args, **kwargs):
+    def trace(self, observer, *args, **kwargs) -> None:
         """
         Register an observer callback to receive arguments from client processes.
 
@@ -344,12 +341,12 @@ def my_callback(args_tuple, prefix, suffix="<<<"):
 
         self._observers[observer] = (args, kwargs)
 
-    def untrace(self, observer):
+    def untrace(self, observer) -> None:
         """Detach (unsubscribe) a callback. Does nothing if the observer is not registered."""
 
         self._observers.pop(observer, None)
 
-    def release(self):
+    def release(self) -> None:
         """
         Release the port, allowing other instances to bind.
 
@@ -366,7 +363,7 @@ def release(self):
 
         self._listening = False
 
-        if hasattr(self, "_timer"):
+        if hasattr(self, "_timer") and self._timer is not None:
             self._timer.cancel()
 
         # No new arguments will arrive after release
@@ -385,7 +382,7 @@ def release(self):
             pass
 
     @property
-    def arguments(self):
+    def arguments(self) -> tuple[tuple[str, ...], ...]:
         """
         Read-only snapshot of arguments received from client processes.
 
@@ -401,7 +398,7 @@ def arguments(self):
         return tuple(self._arguments)
 
     @property
-    def clients(self):
+    def clients(self) -> int:
         """
         Number of client processes that have connected since this singleton was created.
 

From cd9a3bcdd6722790e133175e9b6eecd97c44a708 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:44:38 +0300
Subject: [PATCH 02/14] renamed readme.md to README_.md

---
 readme.md => README_.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
 rename readme.md => README_.md (99%)

diff --git a/readme.md b/README_.md
similarity index 99%
rename from readme.md
rename to README_.md
index 895cead..1933dc7 100644
--- a/readme.md
+++ b/README_.md
@@ -59,7 +59,7 @@ The interpreter exits immediately and we end up back at the prompt.
 
 **See also:**
 
-[Common TCP/UDP Port Numbers](https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers)  
+[Common TCP/UDP Port Numbers](https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers)
 [Windows Socket Error Code 10048](https://learn.microsoft.com/en-us/windows/win32/winsock/windows-sockets-error-codes-2#WSAEADDRINUSE)
 
 It is recommended to specify a port in the constructor\*

From da47308c52781d17956c10f52f93047965c6992a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:45:01 +0300
Subject: [PATCH 03/14] renamed README_.md to README.md

---
 README_.md => README.md | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 rename README_.md => README.md (100%)

diff --git a/README_.md b/README.md
similarity index 100%
rename from README_.md
rename to README.md

From de8bcad4eefec143972df72397504b48193a433d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:46:59 +0300
Subject: [PATCH 04/14] moved Socket_Singleton.py into the src/Socket_Singleton
 dir

---
 pyproject.toml                                | 41 ++++++++++++++++---
 .../Socket_Singleton.py                       |  7 ++--
 src/Socket_Singleton/__init__.py              |  6 +++
 test_app.py                                   |  2 +-
 tests.py                                      |  2 +-
 5 files changed, 47 insertions(+), 11 deletions(-)
 rename src/{ => Socket_Singleton}/Socket_Singleton.py (98%)
 create mode 100644 src/Socket_Singleton/__init__.py

diff --git a/pyproject.toml b/pyproject.toml
index c46eeef..2672142 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,7 +1,34 @@
+[project]
+authors = [
+  {name = "Emboiko", email = "ed@emboiko.com"},
+]
+classifiers = [
+  "Programming Language :: Python :: 3",
+  "Programming Language :: Python :: 3.7",
+  "Programming Language :: Python :: 3.8",
+  "Programming Language :: Python :: 3.9",
+  "Programming Language :: Python :: 3.10",
+  "Programming Language :: Python :: 3.11",
+  "Programming Language :: Python :: 3.12",
+  "Operating System :: OS Independent",
+]
+dependencies = []
+description = "Allow a single instance of a Python application to run at once"
+license = "MIT"
+license-files = ["LICEN[CS]E.*"]
+name = "Socket_Singleton"
+readme = "README.md"
+requires-python = ">=3.7"
+version = "2.0.1"
+
+[project.urls]
+Repository = "https://github.com/emboiko/Socket_Singleton"
+
+[build-system]
+build-backend = "uv_build"
+requires = ["uv_build>=0.11.7,<0.12.0"]
+
 [tool.black]
-line-length = 100
-target-version = ['py37', 'py38', 'py39', 'py310', 'py311', 'py312']
-include = '\.pyi?$'
 extend-exclude = '''
 /(
   # directories
@@ -18,10 +45,12 @@ extend-exclude = '''
   | __pycache__
 )/
 '''
+include = '\.pyi?$'
+line-length = 100
+target-version = ['py37', 'py38', 'py39', 'py310', 'py311', 'py312']
 
 [tool.isort]
-profile = "black"
-line_length = 100
 known_first_party = ["Socket_Singleton"]
+line_length = 100
+profile = "black"
 skip_glob = ["*/__pycache__/*", "*/build/*", "*/dist/*"]
-
diff --git a/src/Socket_Singleton.py b/src/Socket_Singleton/Socket_Singleton.py
similarity index 98%
rename from src/Socket_Singleton.py
rename to src/Socket_Singleton/Socket_Singleton.py
index 3d4a010..e141118 100644
--- a/src/Socket_Singleton.py
+++ b/src/Socket_Singleton/Socket_Singleton.py
@@ -1,6 +1,7 @@
 import errno
 from socket import socket
 from sys import argv
+from typing import Any, Callable
 from threading import Thread, Timer
 
 _WSAEADDRINUSE = 10048
@@ -87,7 +88,7 @@ def __init__(
         # Internally, this functions as a queue. See self.arguments() for external access.
         # Note: Host's own arguments are not stored here - only arguments from client processes.
         self._arguments: list[tuple[str, ...]] = []
-        self._observers = {}
+        self._observers: dict[Callable, tuple[tuple[Any, ...], dict[str, Any]]] = {}
         self._clients = 0
         self._listening = False
         self._thread = None
@@ -316,7 +317,7 @@ def _update_observers(self) -> None:
                         f"raised exception: {type(exc).__name__}: {exc}"
                     )
 
-    def trace(self, observer, *args, **kwargs) -> None:
+    def trace(self, observer: Callable, *args: Any, **kwargs: Any) -> None:
         """
         Register an observer callback to receive arguments from client processes.
 
@@ -341,7 +342,7 @@ def my_callback(args_tuple, prefix, suffix="<<<"):
 
         self._observers[observer] = (args, kwargs)
 
-    def untrace(self, observer) -> None:
+    def untrace(self, observer: Callable) -> None:
         """Detach (unsubscribe) a callback. Does nothing if the observer is not registered."""
 
         self._observers.pop(observer, None)
diff --git a/src/Socket_Singleton/__init__.py b/src/Socket_Singleton/__init__.py
new file mode 100644
index 0000000..2e846ba
--- /dev/null
+++ b/src/Socket_Singleton/__init__.py
@@ -0,0 +1,6 @@
+from .Socket_Singleton import Socket_Singleton, MultipleSingletonsError
+
+__all__ = [
+    "Socket_Singleton",
+    "MultipleSingletonsError",
+]
diff --git a/test_app.py b/test_app.py
index 7422f42..6c6bd83 100644
--- a/test_app.py
+++ b/test_app.py
@@ -2,7 +2,7 @@
 from sys import argv
 from time import sleep
 
-from src.Socket_Singleton import MultipleSingletonsError, Socket_Singleton
+from Socket_Singleton import MultipleSingletonsError, Socket_Singleton
 
 # This file is used for the test cases in test.py and for manual
 # debugging / testing, primarily as a subprocess helper.
diff --git a/tests.py b/tests.py
index 8e59ffa..7da8897 100644
--- a/tests.py
+++ b/tests.py
@@ -14,7 +14,7 @@
 from subprocess import PIPE, STDOUT, Popen, run
 from time import sleep
 
-from src.Socket_Singleton import MultipleSingletonsError, Socket_Singleton
+from Socket_Singleton import MultipleSingletonsError, Socket_Singleton
 
 
 def get_free_port():

From 15841ab304534ab6d11166d0faabb4eaf491b5f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:47:18 +0300
Subject: [PATCH 05/14] added uv.lock

---
 uv.lock | 8 ++++++++
 1 file changed, 8 insertions(+)
 create mode 100644 uv.lock

diff --git a/uv.lock b/uv.lock
new file mode 100644
index 0000000..0fe70b8
--- /dev/null
+++ b/uv.lock
@@ -0,0 +1,8 @@
+version = 1
+revision = 3
+requires-python = ">=3.7"
+
+[[package]]
+name = "socket-singleton"
+version = "2.0.1"
+source = { editable = "." }

From 6cea4ade5132164d2c3c63b8f311491aafa79862 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 19:47:33 +0300
Subject: [PATCH 06/14] disable flake8 in vscode

---
 .vscode/settings.json | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.vscode/settings.json b/.vscode/settings.json
index 851f1da..ee4b482 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -5,5 +5,5 @@
         "editor.formatOnSave": true,
         "editor.defaultFormatter": "ms-python.black-formatter"
     },
+    "flake8.enabled": false,
 }
-

From ae5d53e303d53e8a77b44190538ff520d5608040 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:10:56 +0300
Subject: [PATCH 07/14] update the README; use pytest for driving tests

---
 README.md                                  |  41 +--
 pyproject.toml                             |  10 +
 test_app.py => tests/helper_app.py         |   0
 tests.py => tests/test_socket_singleton.py |   8 +-
 uv.lock                                    | 367 +++++++++++++++++++++
 5 files changed, 400 insertions(+), 26 deletions(-)
 rename test_app.py => tests/helper_app.py (100%)
 rename tests.py => tests/test_socket_singleton.py (99%)

diff --git a/README.md b/README.md
index 1933dc7..2fce2b7 100644
--- a/README.md
+++ b/README.md
@@ -1,18 +1,22 @@
-## Socket_Singleton.py
+# Socket_Singleton.py
 
-### Socket-based, single-instance Python applications with a clean interface
+Socket-based, single-instance Python applications with a clean interface.
 
-###### _Without lockfiles, mutexes, dependencies, or tomfoolery_
+_Without lockfiles, mutexes, dependencies, or tomfoolery._
 
-### Installation & Basic Usage
+## Installation & Basic Usage
 
 **Install:**
 
-`pip install Socket_Singleton -U`
+```bash
+pip install Socket_Singleton -U
+```
 
 **Import:**
 
-`from Socket_Singleton import Socket_Singleton`
+```python
+from Socket_Singleton import Socket_Singleton
+```
 
 **Basic Usage:**
 
@@ -253,7 +257,6 @@ app = Socket_Singleton(secret=secret)
 
 **Important:** Both host and client processes must use the same `secret` value. If they don't match, the client's arguments will be ignored.
 
-
 ## Methods
 
 ### `trace(observer, *args, **kwargs)`
@@ -267,6 +270,7 @@ When you register an observer with `trace()`, you can optionally provide additio
 **Observer signature:**
 
 Your observer callback receives arguments in this order:
+
 1. **First parameter**: A tuple containing all arguments from a single client process
 2. **Followed by**: Any `*args` you provided to `trace()` (unpacked)
 3. **Followed by**: Any `**kwargs` you provided to `trace()` (unpacked)
@@ -407,7 +411,6 @@ An integer property describing how many client processes have connected since in
 print(f"Connected clients: {app.clients}")
 ```
 
-
 ## Context Manager
 
 The context manager protocol is implemented for automatic resource cleanup:
@@ -427,43 +430,35 @@ with Socket_Singleton() as ss:
 
 The port is automatically released when exiting the `with` block.
 
-
 ## Testing
 
-The project includes a comprehensive test suite using Python's built-in `unittest` framework.
+The project includes a comprehensive test suite using `pytest`.
 
 **Run all tests:**
 
 ```bash
-python -m unittest tests
-```
-
-**Run tests with verbose output:**
-
-```bash
-python -m unittest -v tests
+pytest
 ```
 
 **Run a specific test class:**
 
 ```bash
-python -m unittest tests.TestInProcess
-python -m unittest tests.TestArgumentPassing
-python -m unittest tests.TestConcurrency
+pytest tests/test_socket_singleton.py::TestInProcess
 ```
 
 **Run a specific test method:**
 
 ```bash
-python -m unittest tests.TestArgumentPassing.test_multiple_observers
+pytest tests/test_socket_singleton.py::TestInProcess::test_arguments_with_newlines
 ```
 
 **Test structure:**
 
-- `tests.py` - Main test suite with organized test classes
-- `test_app.py` - Helper script for subprocess-based tests
+- `test_socket_singleton.py` - Main test suite with organized test classes
+- `helper_app.py` - Helper script for subprocess-based tests
 
 Tests are organized by concern:
+
 - **TestInProcess**: Fast in-process tests (properties, trace/untrace, context manager)
 - **TestSingletonEnforcement**: Singleton behavior requiring separate processes
 - **TestArgumentPassing**: Argument passing between processes
diff --git a/pyproject.toml b/pyproject.toml
index 2672142..11bff6f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -54,3 +54,13 @@ known_first_party = ["Socket_Singleton"]
 line_length = 100
 profile = "black"
 skip_glob = ["*/__pycache__/*", "*/build/*", "*/dist/*"]
+
+[dependency-groups]
+dev = [
+  "pytest>=7.4.4",
+]
+
+[tool.pytest.ini_options]
+log_cli = true
+log_level = "NOTSET"
+testpaths = ["tests"]
diff --git a/test_app.py b/tests/helper_app.py
similarity index 100%
rename from test_app.py
rename to tests/helper_app.py
diff --git a/tests.py b/tests/test_socket_singleton.py
similarity index 99%
rename from tests.py
rename to tests/test_socket_singleton.py
index 7da8897..af1538c 100644
--- a/tests.py
+++ b/tests/test_socket_singleton.py
@@ -11,6 +11,7 @@
 
 import socket
 import unittest
+from pathlib import Path
 from subprocess import PIPE, STDOUT, Popen, run
 from time import sleep
 
@@ -36,7 +37,8 @@ def run_test_app(command, wait=True, capture_output=False):
     Returns:
         CompletedProcess if wait=True, Popen if wait=False
     """
-    cmd = f"python test_app.py {command}"
+    app_path = Path(__file__).parent / "helper_app.py"
+    cmd = f"python {app_path} {command}"
 
     if wait:
         return run(cmd, shell=True, capture_output=True, text=True)
@@ -836,5 +838,5 @@ def test_rapid_successive_launches(self):
             self.assertTrue(found, f"Missing arguments from rapid{i}")
 
 
-if __name__ == "__main__":
-    unittest.main()
+# if __name__ == "__main__":
+#     unittest.main()
diff --git a/uv.lock b/uv.lock
index 0fe70b8..1d1ba21 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,8 +1,375 @@
 version = 1
 revision = 3
 requires-python = ">=3.7"
+resolution-markers = [
+    "python_full_version >= '3.10'",
+    "python_full_version == '3.9.*'",
+    "python_full_version == '3.8.*'",
+    "python_full_version < '3.8'",
+]
+
+[[package]]
+name = "colorama"
+version = "0.4.6"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/d8/53/6f443c9a4a8358a93a6792e2acffb9d9d5cb0a5cfd8802644b7b1c9a02e4/colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44", size = 27697, upload-time = "2022-10-25T02:36:22.414Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/d1/d6/3965ed04c63042e047cb6a3e6ed1a63a35087b6a609aa3a15ed8ac56c221/colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6", size = 25335, upload-time = "2022-10-25T02:36:20.889Z" },
+]
+
+[[package]]
+name = "exceptiongroup"
+version = "1.3.1"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions", version = "4.7.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.8'" },
+    { name = "typing-extensions", version = "4.13.2", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version == '3.8.*'" },
+    { name = "typing-extensions", version = "4.15.0", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version >= '3.9' and python_full_version < '3.13'" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/50/79/66800aadf48771f6b62f7eb014e352e5d06856655206165d775e675a02c9/exceptiongroup-1.3.1.tar.gz", hash = "sha256:8b412432c6055b0b7d14c310000ae93352ed6754f70fa8f7c34141f91c4e3219", size = 30371, upload-time = "2025-11-21T23:01:54.787Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/8a/0e/97c33bf5009bdbac74fd2beace167cab3f978feb69cc36f1ef79360d6c4e/exceptiongroup-1.3.1-py3-none-any.whl", hash = "sha256:a7a39a3bd276781e98394987d3a5701d0c4edffb633bb7a5144577f82c773598", size = 16740, upload-time = "2025-11-21T23:01:53.443Z" },
+]
+
+[[package]]
+name = "importlib-metadata"
+version = "6.7.0"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "typing-extensions", version = "4.7.1", source = { registry = "https://pypi.org/simple" }, marker = "python_full_version < '3.8'" },
+    { name = "zipp", marker = "python_full_version < '3.8'" },
+]
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+sdist = { url = "https://files.pythonhosted.org/packages/f6/37/23083fcd6e35492953e8d2aaaa68b860eb422b34627b13f2ce3eb6106061/typing_extensions-4.13.2.tar.gz", hash = "sha256:e6c81219bd689f51865d9e372991c540bda33a0379d5573cddb9a3a23f7caaef", size = 106967, upload-time = "2025-04-10T14:19:05.416Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/8b/54/b1ae86c0973cc6f0210b53d508ca3641fb6d0c56823f288d108bc7ab3cc8/typing_extensions-4.13.2-py3-none-any.whl", hash = "sha256:a439e7c04b49fec3e5d3e2beaa21755cadbbdc391694e28ccdd36ca4a1408f8c", size = 45806, upload-time = "2025-04-10T14:19:03.967Z" },
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.15.0"
+source = { registry = "https://pypi.org/simple" }
+resolution-markers = [
+    "python_full_version >= '3.10'",
+    "python_full_version == '3.9.*'",
+]
+sdist = { url = "https://files.pythonhosted.org/packages/72/94/1a15dd82efb362ac84269196e94cf00f187f7ed21c242792a923cdb1c61f/typing_extensions-4.15.0.tar.gz", hash = "sha256:0cea48d173cc12fa28ecabc3b837ea3cf6f38c6d1136f85cbaaf598984861466", size = 109391, upload-time = "2025-08-25T13:49:26.313Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/18/67/36e9267722cc04a6b9f15c7f3441c2363321a3ea07da7ae0c0707beb2a9c/typing_extensions-4.15.0-py3-none-any.whl", hash = "sha256:f0fa19c6845758ab08074a0cfa8b7aecb71c999ca73d62883bc25cc018c4e548", size = 44614, upload-time = "2025-08-25T13:49:24.86Z" },
+]
+
+[[package]]
+name = "zipp"
+version = "3.15.0"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/00/27/f0ac6b846684cecce1ee93d32450c45ab607f65c2e0255f0092032d91f07/zipp-3.15.0.tar.gz", hash = "sha256:112929ad649da941c23de50f356a2b5570c954b65150642bccdd66bf194d224b", size = 18454, upload-time = "2023-02-25T02:17:22.503Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/5b/fa/c9e82bbe1af6266adf08afb563905eb87cab83fde00a0a08963510621047/zipp-3.15.0-py3-none-any.whl", hash = "sha256:48904fc76a60e542af151aded95726c1a5c34ed43ab4134b597665c86d7ad556", size = 6758, upload-time = "2023-02-25T02:17:20.807Z" },
+]

From b4c45e6295fa53467fa4b1fc1b324fcb762ad12f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:18:24 +0300
Subject: [PATCH 08/14] updated the README

---
 README.md | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 2fce2b7..0af8ca1 100644
--- a/README.md
+++ b/README.md
@@ -249,7 +249,7 @@ secret = os.getenv("SOCKET_SINGLETON_SECRET")
 app = Socket_Singleton(secret=secret)
 ```
 
-**How it works interally:**
+**How it works internally:**
 
 - If `secret` is `None` (default): No verification - any connection is accepted by the host
 - If `secret` is provided to the host: Clients must send the secret as the first part of their message over the socket (before a null byte `\x00`), followed by arguments from their process
@@ -391,7 +391,6 @@ And in a new shell (after `release()` was called):
 - **Context manager alternative**: For most use cases, the context manager protocol (see below) is cleaner and automatically handles cleanup.
 - **Timer cancellation**: If a timeout was set, calling `release()` will cancel it prematurely.
 
-
 ## Properties
 
 ### `arguments`

From 7f8ed9740a9eee919a5168e288724780ca8a9b4a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:23:54 +0300
Subject: [PATCH 09/14] added `trace_no_args` option to `Socket_Singleton`

---
 src/Socket_Singleton/Socket_Singleton.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Socket_Singleton/Socket_Singleton.py b/src/Socket_Singleton/Socket_Singleton.py
index e141118..872b5cd 100644
--- a/src/Socket_Singleton/Socket_Singleton.py
+++ b/src/Socket_Singleton/Socket_Singleton.py
@@ -34,6 +34,9 @@ class Socket_Singleton:
         secret: Optional secret string for client verification. If provided, clients
             must send this secret before their arguments. Defaults to None (no verification).
             Useful for preventing unauthorized applications from injecting arguments.
+        trace_no_args: If False (the default), the trace callbacks will not be executed
+            when a client process is called without any args. If True, the trace callbacks
+            will be executed even if the client process is called with no args.
     """
 
     def __init__(
@@ -47,6 +50,7 @@ def __init__(
         max_clients: int = 0,
         verbose: bool = False,
         secret: str | None = None,
+        trace_no_args: bool = False,
     ) -> None:
         """
         Initialize the singleton instance.
@@ -74,6 +78,7 @@ def __init__(
         self.max_clients = int(max_clients)
         self.verbose = bool(verbose)
         self.secret = str(secret) if secret is not None else None
+        self.trace_no_args = bool(trace_no_args)
 
         if not (0 <= self.port <= 65535):
             raise ValueError("port must be between 0 and 65535 (inclusive)")
@@ -221,7 +226,7 @@ def _create_server(self) -> None:
 
                             # Filter out empty strings
                             args = tuple(arg for arg in parts if arg)
-                            if args:
+                            if args or self.trace_no_args:
                                 self._append_args(args)
                         except (UnicodeDecodeError, AttributeError):
                             # Invalid data received - skip this client's arguments

From abd4b60dad23ffda5d347ccba99d3ecf009b9cc2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:28:27 +0300
Subject: [PATCH 10/14] ignore .venv

---
 .gitignore | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 8a98bab..1edb407 100644
--- a/.gitignore
+++ b/.gitignore
@@ -107,4 +107,6 @@ dmypy.json
 # Pyre type checker
 .pyre/
 
-# End of https://www.gitignore.io/api/python
\ No newline at end of file
+# End of https://www.gitignore.io/api/python
+
+.venv

From 07f092c8aa817125e762d6e84dd10a33350c3121 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:28:44 +0300
Subject: [PATCH 11/14] remove old publishing files

---
 MANIFEST.in |  4 ----
 publish.bat | 29 -----------------------------
 publish.sh  | 29 -----------------------------
 setup.py    | 34 ----------------------------------
 4 files changed, 96 deletions(-)
 delete mode 100644 MANIFEST.in
 delete mode 100644 publish.bat
 delete mode 100644 publish.sh
 delete mode 100644 setup.py

diff --git a/MANIFEST.in b/MANIFEST.in
deleted file mode 100644
index 5f26fd5..0000000
--- a/MANIFEST.in
+++ /dev/null
@@ -1,4 +0,0 @@
-include readme.md
-include LICENSE.txt
-include pyproject.toml
-
diff --git a/publish.bat b/publish.bat
deleted file mode 100644
index e934a64..0000000
--- a/publish.bat
+++ /dev/null
@@ -1,29 +0,0 @@
-@echo off
-REM Publish Socket_Singleton to PyPI
-REM Usage: publish.bat
-
-echo Installing build dependencies...
-pip install --upgrade build twine
-
-echo Cleaning previous builds...
-if exist dist rmdir /s /q dist
-if exist build rmdir /s /q build
-if exist *.egg-info rmdir /s /q *.egg-info
-
-echo Building package...
-python -m build
-
-echo Checking package...
-twine check dist/*
-
-echo.
-echo Build complete! Files created in dist/:
-dir dist
-
-echo.
-echo To upload to PyPI, run:
-echo   twine upload dist/*
-echo.
-echo To upload to TestPyPI first (recommended), run:
-echo   twine upload --repository testpypi dist/*
-
diff --git a/publish.sh b/publish.sh
deleted file mode 100644
index 9f2e4e4..0000000
--- a/publish.sh
+++ /dev/null
@@ -1,29 +0,0 @@
-#!/bin/bash
-# Publish Socket_Singleton to PyPI
-# Usage: ./publish.sh
-
-set -e
-
-echo "Installing build dependencies..."
-pip install --upgrade build twine
-
-echo "Cleaning previous builds..."
-rm -rf dist/ build/ *.egg-info
-
-echo "Building package..."
-python -m build
-
-echo "Checking package..."
-twine check dist/*
-
-echo ""
-echo "Build complete! Files created in dist/:"
-ls -lh dist/
-
-echo ""
-echo "To upload to PyPI, run:"
-echo "  twine upload dist/*"
-echo ""
-echo "To upload to TestPyPI first (recommended), run:"
-echo "  twine upload --repository testpypi dist/*"
-
diff --git a/setup.py b/setup.py
deleted file mode 100644
index 6085142..0000000
--- a/setup.py
+++ /dev/null
@@ -1,34 +0,0 @@
-from pathlib import Path
-from setuptools import setup
-
-# Get the directory containing setup.py
-here = Path(__file__).parent
-readme_path = here / "readme.md"
-
-with open(readme_path, encoding="utf-8") as readme:
-    long_description = readme.read()
-
-setup(
-    name="Socket_Singleton",
-    version="2.0.0",
-    description="Allow a single instance of a Python application to run at once",
-    py_modules=["Socket_Singleton"],
-    package_dir={"": "src"},
-    license="MIT",
-    classifiers=[
-        "Programming Language :: Python :: 3",
-        "Programming Language :: Python :: 3.7",
-        "Programming Language :: Python :: 3.8",
-        "Programming Language :: Python :: 3.9",
-        "Programming Language :: Python :: 3.10",
-        "Programming Language :: Python :: 3.11",
-        "Programming Language :: Python :: 3.12",
-        "License :: OSI Approved :: MIT License",
-        "Operating System :: OS Independent",
-    ],
-    long_description=long_description,
-    long_description_content_type="text/markdown",
-    url="https://github.com/emboiko/Socket_Singleton",
-    author="Emboiko",
-    author_email="ed@emboiko.com",
-)

From bac80202b7e2180d59a6d9fbfa215facd377fc5e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:34:23 +0300
Subject: [PATCH 12/14] renamed src/Socket_Singleton to socket_singleton

---
 src/{Socket_Singleton => socket_singleton_}/Socket_Singleton.py | 0
 src/{Socket_Singleton => socket_singleton_}/__init__.py         | 0
 2 files changed, 0 insertions(+), 0 deletions(-)
 rename src/{Socket_Singleton => socket_singleton_}/Socket_Singleton.py (100%)
 rename src/{Socket_Singleton => socket_singleton_}/__init__.py (100%)

diff --git a/src/Socket_Singleton/Socket_Singleton.py b/src/socket_singleton_/Socket_Singleton.py
similarity index 100%
rename from src/Socket_Singleton/Socket_Singleton.py
rename to src/socket_singleton_/Socket_Singleton.py
diff --git a/src/Socket_Singleton/__init__.py b/src/socket_singleton_/__init__.py
similarity index 100%
rename from src/Socket_Singleton/__init__.py
rename to src/socket_singleton_/__init__.py

From d521ce8acadcd695f39909592d00790e75a809d4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 20:44:44 +0300
Subject: [PATCH 13/14] renamed src/socket_singleton_ to src/socket_singleton;
 renamed Socket_Singleton to SocketSingleton; updated the README

---
 README.md                                     | 68 +++++++++----------
 pyproject.toml                                |  2 +-
 .../__init__.py}                              |  2 +-
 src/socket_singleton_/__init__.py             |  6 --
 tests/helper_app.py                           | 28 ++++----
 tests/test_socket_singleton.py                | 46 ++++++-------
 6 files changed, 73 insertions(+), 79 deletions(-)
 rename src/{socket_singleton_/Socket_Singleton.py => socket_singleton/__init__.py} (99%)
 delete mode 100644 src/socket_singleton_/__init__.py

diff --git a/README.md b/README.md
index 0af8ca1..27aee79 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Socket_Singleton.py
+# socket_singleton
 
 Socket-based, single-instance Python applications with a clean interface.
 
@@ -15,20 +15,20 @@ pip install Socket_Singleton -U
 **Import:**
 
 ```python
-from Socket_Singleton import Socket_Singleton
+from socket_singleton import SocketSingleton
 ```
 
 **Basic Usage:**
 
 ```python
 # Simple singleton enforcement
-Socket_Singleton()
+SocketSingleton()
 ```
 
 or, keep a reference:
 
 ```python
-app = Socket_Singleton()
+app = SocketSingleton()
 ```
 
 **Basic Example:**
@@ -38,8 +38,8 @@ We have an application, `app.py` that we want to restrict to a single instance:
 ```python
 #app.py
 
-from Socket_Singleton import Socket_Singleton
-Socket_Singleton()
+from socket_singleton import SocketSingleton
+SocketSingleton()
 input()  # Blocking call to simulate your_business_logic()
 ```
 
@@ -72,7 +72,7 @@ It is recommended to specify a port in the constructor\*
 
 **Constructor:**
 
-`Socket_Singleton(address="127.0.0.1", port=1337, timeout=0, client=True, strict=True, release_threshold=0, max_clients=0, verbose=False, secret=None)`
+`SocketSingleton(address="127.0.0.1", port=1337, timeout=0, client=True, strict=True, release_threshold=0, max_clients=0, verbose=False, secret=None)`
 
 ### `address`
 
@@ -82,9 +82,9 @@ The IP address to bind the socket to. Defaults to `"127.0.0.1"` (localhost). Thi
 
 ```python
 # Binds to localhost - machine-wide singleton
-app = Socket_Singleton()
+app = SocketSingleton()
 # or explicitly:
-app = Socket_Singleton(address="127.0.0.1")
+app = SocketSingleton(address="127.0.0.1")
 ```
 
 **Multi-homed systems example:**
@@ -97,10 +97,10 @@ On a system with multiple network interfaces, you can create separate singleton
 # Interface 2: 10.0.0.50 (VPN network)
 
 # Internal network singleton
-internal_app = Socket_Singleton(address="192.168.1.100", port=1337)
+internal_app = SocketSingleton(address="192.168.1.100", port=1337)
 
 # VPN network singleton (separate instance)
-vpn_app = Socket_Singleton(address="10.0.0.50", port=1337)
+vpn_app = SocketSingleton(address="10.0.0.50", port=1337)
 
 # These can coexist because they're on different interfaces!
 ```
@@ -111,13 +111,13 @@ In containerized environments, you might want per-container singletons:
 
 ```python
 # Container A
-app_a = Socket_Singleton(address="172.17.0.2", port=1337)
+app_a = SocketSingleton(address="172.17.0.2", port=1337)
 
 # Container B
-app_b = Socket_Singleton(address="172.17.0.3", port=1337)
+app_b = SocketSingleton(address="172.17.0.3", port=1337)
 
 # Host machine
-host_app = Socket_Singleton(address="127.0.0.1", port=1337)
+host_app = SocketSingleton(address="127.0.0.1", port=1337)
 
 # All three can run simultaneously on different addresses
 ```
@@ -128,7 +128,7 @@ You can bind to all available interfaces using `"0.0.0.0"`:
 
 ```python
 # Binds to all network interfaces
-app = Socket_Singleton(address="0.0.0.0", port=1337)
+app = SocketSingleton(address="0.0.0.0", port=1337)
 ```
 
 Note: For most applications, the default `127.0.0.1` (localhost) is what you want - a machine-wide singleton instance. The `address` parameter provides flexibility for specialized network configurations.
@@ -150,11 +150,11 @@ If `False`, client processes won't send arguments to the host. Defaults to `True
 If `False`, raises `MultipleSingletonsError` instead of `SystemExit` when a second instance tries to run. Defaults to `True`.
 
 ```python
-from Socket_Singleton import Socket_Singleton, MultipleSingletonsError
+from socket_singleton import SocketSingleton, MultipleSingletonsError
 
 def main():
     try:
-        app = Socket_Singleton(strict=False)
+        app = SocketSingleton(strict=False)
     except MultipleSingletonsError as err:
         print("We are not the singleton.")
         print(err)
@@ -173,7 +173,7 @@ Release the port after this many client connections. Defaults to `0` (never rele
 
 ```python
 # Stop accepting connections after 10 clients
-app = Socket_Singleton(release_threshold=10)
+app = SocketSingleton(release_threshold=10)
 ```
 
 ### `max_clients`
@@ -182,7 +182,7 @@ Stop processing arguments after this many client connections. Defaults to `0` (p
 
 ```python
 # Rate limit: ignore arguments after 5 clients, but keep accepting connections
-app = Socket_Singleton(max_clients=5)
+app = SocketSingleton(max_clients=5)
 ```
 
 **Combined usage:**
@@ -191,7 +191,7 @@ You can use both parameters together for more complex scenarios:
 
 ```python
 # Throttle arguments at 5 clients, stop accepting at 10 clients
-app = Socket_Singleton(max_clients=5, release_threshold=10)
+app = SocketSingleton(max_clients=5, release_threshold=10)
 ```
 
 **Important:** When using both parameters together:
@@ -206,10 +206,10 @@ Enable verbose output for debugging. When `True`, prints warnings for connection
 
 ```python
 # Silent operation (default)
-app = Socket_Singleton()
+app = SocketSingleton()
 
 # Verbose mode - prints warnings for errors
-app = Socket_Singleton(verbose=True)
+app = SocketSingleton(verbose=True)
 ```
 
 **When verbose mode is enabled, you'll see warnings for:**
@@ -225,28 +225,28 @@ Optional secret string for client verification. If provided, clients must send t
 
 **Security Note:**
 
-By default, `Socket_Singleton` accepts connections from any process that can connect to the port. This is fine for localhost-only singleton enforcement, but if you're concerned about unauthorized applications connecting and injecting arguments, you can use the `secret` parameter.
+By default, `SocketSingleton` accepts connections from any process that can connect to the port. This is fine for localhost-only singleton enforcement, but if you're concerned about unauthorized applications connecting and injecting arguments, you can use the `secret` parameter.
 
 **Basic usage:**
 
 ```python
 # Host process
-app = Socket_Singleton(secret="my-secret-key")
+app = SocketSingleton(secret="my-secret-key")
 app.trace(callback)
 
 # Client processes (must use same secret)
-Socket_Singleton(secret="my-secret-key")  # Will send secret + args from the process
+SocketSingleton(secret="my-secret-key")  # Will send secret + args from the process
 ```
 
 **Using environment variables:**
 
 ```python
 import os
-from Socket_Singleton import Socket_Singleton
+from socket_singleton import SocketSingleton
 
 # Read secret from environment variable
 secret = os.getenv("SOCKET_SINGLETON_SECRET")
-app = Socket_Singleton(secret=secret)
+app = SocketSingleton(secret=secret)
 ```
 
 **How it works internally:**
@@ -280,7 +280,7 @@ Your observer callback receives arguments in this order:
 ```python
 #app.py
 
-from Socket_Singleton import Socket_Singleton
+from socket_singleton import SocketSingleton
 
 def callback(client_args, prefix="Received: "):
     # client_args is a tuple like ("foo", "bar", "baz")
@@ -289,7 +289,7 @@ def callback(client_args, prefix="Received: "):
     # do_a_thing(client_args)
 
 def main():
-    app = Socket_Singleton()
+    app = SocketSingleton()
     app.trace(callback, prefix=">>> ")  # Store "prefix" to be passed later
     input()  # Blocking call to simulate your_business_logic()
 
@@ -356,10 +356,10 @@ Release the port, allowing other instances to bind. Stops the server thread, can
 ```python
 #app.py
 
-from Socket_Singleton import Socket_Singleton
+from socket_singleton import SocketSingleton
 
 def main():
-    app = Socket_Singleton()
+    app = SocketSingleton()
     # Do some work...
     app.release()  # Release the port, allowing other instances to run
     print("Port released - other instances can now bind!")
@@ -415,14 +415,14 @@ print(f"Connected clients: {app.clients}")
 The context manager protocol is implemented for automatic resource cleanup:
 
 ```python
-with Socket_Singleton():
+with SocketSingleton():
     input()  # Blocking call to simulate your_business_logic()
 ```
 
-`Socket_Singleton.__enter__()` returns `self` so you can have access to the object if needed:
+`SocketSingleton.__enter__()` returns `self` so you can have access to the object if needed:
 
 ```python
-with Socket_Singleton() as ss:
+with SocketSingleton() as ss:
     ss.trace(callback)
     input()  # Blocking call to simulate your_business_logic()
 ```
diff --git a/pyproject.toml b/pyproject.toml
index 11bff6f..60cc118 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ license-files = ["LICEN[CS]E.*"]
 name = "Socket_Singleton"
 readme = "README.md"
 requires-python = ">=3.7"
-version = "2.0.1"
+version = "2.0.2"
 
 [project.urls]
 Repository = "https://github.com/emboiko/Socket_Singleton"
diff --git a/src/socket_singleton_/Socket_Singleton.py b/src/socket_singleton/__init__.py
similarity index 99%
rename from src/socket_singleton_/Socket_Singleton.py
rename to src/socket_singleton/__init__.py
index 872b5cd..da92992 100644
--- a/src/socket_singleton_/Socket_Singleton.py
+++ b/src/socket_singleton/__init__.py
@@ -7,7 +7,7 @@
 _WSAEADDRINUSE = 10048
 
 
-class Socket_Singleton:
+class SocketSingleton:
     """
     Enforces a single instance of a Python application using socket binding.
 
diff --git a/src/socket_singleton_/__init__.py b/src/socket_singleton_/__init__.py
deleted file mode 100644
index 2e846ba..0000000
--- a/src/socket_singleton_/__init__.py
+++ /dev/null
@@ -1,6 +0,0 @@
-from .Socket_Singleton import Socket_Singleton, MultipleSingletonsError
-
-__all__ = [
-    "Socket_Singleton",
-    "MultipleSingletonsError",
-]
diff --git a/tests/helper_app.py b/tests/helper_app.py
index 6c6bd83..9dfd10a 100644
--- a/tests/helper_app.py
+++ b/tests/helper_app.py
@@ -2,7 +2,7 @@
 from sys import argv
 from time import sleep
 
-from Socket_Singleton import MultipleSingletonsError, Socket_Singleton
+from socket_singleton import MultipleSingletonsError, SocketSingleton
 
 # This file is used for the test cases in test.py and for manual
 # debugging / testing, primarily as a subprocess helper.
@@ -30,9 +30,9 @@ def default(port=None):
     # Create singleton - it will read the modified argv[1:]
     try:
         if port is not None:
-            Socket_Singleton(port=port)
+            SocketSingleton(port=port)
         else:
-            Socket_Singleton()
+            SocketSingleton()
     finally:
         # Note: We don't restore argv here because the modification is intentional
         # and needed for _create_client() to send the correct arguments
@@ -42,7 +42,7 @@ def default(port=None):
 
 
 def timeout(seconds, port):
-    Socket_Singleton(timeout=seconds, port=port)
+    SocketSingleton(timeout=seconds, port=port)
 
 
 def callback(args_tuple):
@@ -51,7 +51,7 @@ def callback(args_tuple):
 
 def trace(seconds):
     # Manual testing helper - blocks thread on purpose
-    app = Socket_Singleton()
+    app = SocketSingleton()
     print("Singleton locked")
     app.trace(callback)
     sleep(seconds)
@@ -60,9 +60,9 @@ def trace(seconds):
 def no_strict(port=None):
     try:
         if port is not None:
-            Socket_Singleton(port=port, strict=False)
+            SocketSingleton(port=port, strict=False)
         else:
-            Socket_Singleton(strict=False)
+            SocketSingleton(strict=False)
         print("Singleton locked")
 
     except MultipleSingletonsError:
@@ -70,7 +70,7 @@ def no_strict(port=None):
 
 
 def release(seconds, port):
-    app = Socket_Singleton(port=port)
+    app = SocketSingleton(port=port)
     app.release()
     sleep(seconds)
 
@@ -86,7 +86,7 @@ def verbose_host(port, wait_seconds=1):
     def bad_callback(args_tuple):
         raise ValueError("Intentional test exception")
 
-    app = Socket_Singleton(port=port, verbose=True)
+    app = SocketSingleton(port=port, verbose=True)
     app.trace(bad_callback)
     print("Host ready")
     # Keep running momentarily to receive client connections
@@ -94,7 +94,7 @@ def bad_callback(args_tuple):
 
 
 def context():
-    with Socket_Singleton():
+    with SocketSingleton():
         print("Singleton locked")
 
 
@@ -111,13 +111,13 @@ def no_client(port=None):
 
     # Create singleton with client=False
     if port is not None:
-        Socket_Singleton(port=port, client=False)
+        SocketSingleton(port=port, client=False)
     else:
-        Socket_Singleton(client=False)
+        SocketSingleton(client=False)
 
 
 def max_clients():
-    app = Socket_Singleton(max_clients=3)
+    app = SocketSingleton(max_clients=3)
     app.trace(callback)
     input()
 
@@ -181,7 +181,7 @@ def main():
         verbose_host(port, wait_seconds)
     elif command == "debug":
         # Debug block - hardcode your debugging scenario here for use with a debugger:
-        Socket_Singleton()
+        SocketSingleton()
 
 
 if __name__ == "__main__":
diff --git a/tests/test_socket_singleton.py b/tests/test_socket_singleton.py
index af1538c..83dfedb 100644
--- a/tests/test_socket_singleton.py
+++ b/tests/test_socket_singleton.py
@@ -15,7 +15,7 @@
 from subprocess import PIPE, STDOUT, Popen, run
 from time import sleep
 
-from Socket_Singleton import MultipleSingletonsError, Socket_Singleton
+from socket_singleton import MultipleSingletonsError, SocketSingleton
 
 
 def get_free_port():
@@ -55,7 +55,7 @@ class TestInProcess(unittest.TestCase):
     def setUp(self):
         """Use a unique port for each test to avoid conflicts."""
         self.port = get_free_port()
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
         self.traced_args = []
 
     def tearDown(self):
@@ -138,12 +138,12 @@ def test_release_idempotency(self):
     def test_context_manager(self):
         """Test context manager protocol."""
         port = get_free_port()
-        with Socket_Singleton(port=port) as app:
+        with SocketSingleton(port=port) as app:
             self.assertTrue(app._listening)
-            self.assertIsInstance(app, Socket_Singleton)
+            self.assertIsInstance(app, SocketSingleton)
 
         # Should be able to bind again
-        app2 = Socket_Singleton(port=port)
+        app2 = SocketSingleton(port=port)
         self.assertTrue(app2._listening)
         app2.release()
 
@@ -153,7 +153,7 @@ def test_secret_verification(self):
         secret = "test-secret-123"
 
         # Create host with secret
-        host = Socket_Singleton(port=port, secret=secret)
+        host = SocketSingleton(port=port, secret=secret)
         received_args = []
 
         def callback(args_tuple):
@@ -202,7 +202,7 @@ def callback(args_tuple):
     def test_arguments_with_newlines(self):
         """Test that arguments containing newlines are handled correctly."""
         port = get_free_port()
-        host = Socket_Singleton(port=port)
+        host = SocketSingleton(port=port)
         received_args = []
 
         def callback(args_tuple):
@@ -236,7 +236,7 @@ def callback(args_tuple):
     def test_string_representations(self):
         """Test __str__ and __repr__ methods."""
         port = get_free_port()
-        app = Socket_Singleton(port=port, timeout=10, verbose=True)
+        app = SocketSingleton(port=port, timeout=10, verbose=True)
 
         # Test __str__ - should be human-readable
         str_repr = str(app)
@@ -274,7 +274,7 @@ def test_string_representations(self):
         app.release()
 
         # Test __repr__ with secret (should be masked)
-        app_with_secret = Socket_Singleton(port=get_free_port(), secret="my-secret")
+        app_with_secret = SocketSingleton(port=get_free_port(), secret="my-secret")
         repr_with_secret = repr(app_with_secret)
         self.assertIn("secret=***", repr_with_secret)  # Secret should be masked
         self.assertNotIn("my-secret", repr_with_secret)  # Actual secret should not appear
@@ -287,25 +287,25 @@ class TestValidation(unittest.TestCase):
     def test_invalid_port_too_low(self):
         """Test that port < 0 raises ValueError."""
         with self.assertRaises(ValueError) as context:
-            Socket_Singleton(port=-1)
+            SocketSingleton(port=-1)
         self.assertIn("port must be between 0 and 65535", str(context.exception))
 
     def test_invalid_port_too_high(self):
         """Test that port > 65535 raises ValueError."""
         with self.assertRaises(ValueError) as context:
-            Socket_Singleton(port=65536)
+            SocketSingleton(port=65536)
         self.assertIn("port must be between 0 and 65535", str(context.exception))
 
     def test_invalid_timeout(self):
         """Test that timeout < 0 raises ValueError."""
         with self.assertRaises(ValueError) as context:
-            Socket_Singleton(port=get_free_port(), timeout=-1)
+            SocketSingleton(port=get_free_port(), timeout=-1)
         self.assertIn("timeout must be greater than or equal to 0", str(context.exception))
 
     def test_invalid_release_threshold(self):
         """Test that release_threshold < 0 raises ValueError."""
         with self.assertRaises(ValueError) as context:
-            Socket_Singleton(port=get_free_port(), release_threshold=-1)
+            SocketSingleton(port=get_free_port(), release_threshold=-1)
         self.assertIn(
             "release_threshold must be greater than or equal to 0", str(context.exception)
         )
@@ -313,7 +313,7 @@ def test_invalid_release_threshold(self):
     def test_invalid_max_clients(self):
         """Test that max_clients < 0 raises ValueError."""
         with self.assertRaises(ValueError) as context:
-            Socket_Singleton(port=get_free_port(), max_clients=-1)
+            SocketSingleton(port=get_free_port(), max_clients=-1)
         self.assertIn("max_clients must be greater than or equal to 0", str(context.exception))
 
 
@@ -324,7 +324,7 @@ def setUp(self):
         """Use a unique port for each test."""
         self.port = get_free_port()
         # Create a singleton in this process
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
 
     def tearDown(self):
         """Clean up after each test."""
@@ -377,7 +377,7 @@ def test_no_strict_mode(self):
         # Try to create another instance in the same process with strict=False
         # This should raise MultipleSingletonsError
         with self.assertRaises(MultipleSingletonsError) as context:
-            Socket_Singleton(port=self.port, strict=False)
+            SocketSingleton(port=self.port, strict=False)
 
         # Verify the error message
         self.assertIn("already bound & listening", str(context.exception))
@@ -394,7 +394,7 @@ class TestArgumentPassing(unittest.TestCase):
     def setUp(self):
         """Set up singleton with observer."""
         self.port = get_free_port()
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
         self.received_args = []
 
         def callback(args_tuple):
@@ -443,7 +443,7 @@ def test_no_client_mode(self):
         self.app.release()
 
         # Create new host singleton (normal, client=True doesn't matter for host)
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
         self.received_args = []
 
         def callback(args_tuple):
@@ -639,7 +639,7 @@ def setUp(self):
         def callback(args_tuple):
             self.received_args.append(args_tuple)
 
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
         self.app.trace(callback)
 
     def tearDown(self):
@@ -652,7 +652,7 @@ def test_max_clients(self):
         self.app.release()
 
         # Create new singleton with max_clients=2
-        self.app = Socket_Singleton(port=self.port, max_clients=2)
+        self.app = SocketSingleton(port=self.port, max_clients=2)
         self.received_args = []
 
         def callback(args_tuple):
@@ -675,7 +675,7 @@ def test_release_threshold(self):
         self.app.release()
 
         # Create singleton with release_threshold=2
-        self.app = Socket_Singleton(port=self.port, release_threshold=2)
+        self.app = SocketSingleton(port=self.port, release_threshold=2)
         self.received_args = []
 
         def callback(args_tuple):
@@ -700,7 +700,7 @@ def test_combined_thresholds(self):
         # release_threshold=5: release port after 5 clients
         # This tests that max_clients stops processing args, but connections continue
         # until release_threshold is reached
-        self.app = Socket_Singleton(port=self.port, max_clients=3, release_threshold=5)
+        self.app = SocketSingleton(port=self.port, max_clients=3, release_threshold=5)
         self.received_args = []
 
         def callback(args_tuple):
@@ -736,7 +736,7 @@ class TestConcurrency(unittest.TestCase):
     def setUp(self):
         """Set up singleton with observer."""
         self.port = get_free_port()
-        self.app = Socket_Singleton(port=self.port)
+        self.app = SocketSingleton(port=self.port)
         self.received_args = []
 
         def callback(args_tuple):

From d69917a7b8854a28285d2f308d9e85bffad1113f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ioan=20C=C4=83lin?= <iborco@gmail.com>
Date: Mon, 27 Apr 2026 21:07:28 +0300
Subject: [PATCH 14/14] added a `py.typed`

---
 pyproject.toml                | 2 +-
 src/socket_singleton/py.typed | 0
 2 files changed, 1 insertion(+), 1 deletion(-)
 create mode 100644 src/socket_singleton/py.typed

diff --git a/pyproject.toml b/pyproject.toml
index 60cc118..e552e72 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,7 +19,7 @@ license-files = ["LICEN[CS]E.*"]
 name = "Socket_Singleton"
 readme = "README.md"
 requires-python = ">=3.7"
-version = "2.0.2"
+version = "2.0.3"
 
 [project.urls]
 Repository = "https://github.com/emboiko/Socket_Singleton"
diff --git a/src/socket_singleton/py.typed b/src/socket_singleton/py.typed
new file mode 100644
index 0000000..e69de29