gh-73138: Add strict attribute to csv.Dialect

Lib/csv.py

@@ -92,7 +92,7 @@ class Dialect:
 
     This must be subclassed (see csv.excel).  Valid attributes are:
     delimiter, quotechar, escapechar, doublequote, skipinitialspace,
-    lineterminator, quoting.
+    lineterminator, quoting, strict.
 
     """
     _name = ""
@@ -105,6 +105,7 @@ class Dialect:
     skipinitialspace = None
     lineterminator = None
     quoting = None
+    strict = None
 
     def __init__(self):
         if self.__class__ != Dialect:

Lib/test/test_csv.py

@@ -754,7 +754,7 @@ class mydialect(csv.Dialect):
         self.assertEqual(dialect.delimiter, ';')
         self.assertEqual(dialect.quoting, csv.QUOTE_ALL)
         self.assertEqual(list(csv.reader(['a:b'], new)), [['a', 'b']])
-        # "strict" is supported even if it is not set on the class.
+        # "strict" is supported even if it is not set on the subclass.
         self.assertTrue(copy.replace(dialect, strict=True).strict)
 
         with self.assertRaises(csv.Error):

Misc/NEWS.d/next/Library/2022-12-18-21-24-48.gh-issue-73138.9TOxub.rst

@@ -0,0 +1 @@
+Add the :attr:`~csv.Dialect.strict` attribute to :class:`csv.Dialect`.