Prompt Templates using LangChain

A clean and simple Python repository demonstrating how to create, format, and manage dynamic prompt templates using the official LangChain core library.

This project shows how to transition from basic static strings to interactive, user-driven prompt generation.

🚀 Getting Started

Prerequisites

Make sure you have Python installed, then install the core LangChain library:

pip install langchain-core

Simple Example (Basic String Template)

Here is a straightforward example of using PromptTemplate.from_template to automatically detect a variable and format a quick question:

from langchain_core.prompts import PromptTemplate

# 1. Define the template with a placeholder
template = PromptTemplate.from_template("What is the capital city of {country}?")

# 2. Fill in the variable
final_prompt = template.format(country="India")

print(final_prompt)
# Output: What is the capital city of India?

💻 Interactive Prompt Generator

The main script in this repository features an interactive Command Line Interface (CLI) application. It explicitly maps out multiple variables (role, experience, topic, subject, level) to build detailed, constraint-based textbook content generation prompts for LLMs.

Run the Application

Save the code to a file (e.g., app.py) and execute it.