Prompt Claude to Generate Python Code

Claude, developed by Anthropic, is one of the most powerful AI assistants for generating Python code. Thanks to its deep understanding of programming paradigms, best practices, and popular libraries, Claude can produce clean, documented, and functional code in seconds. Whether you are a beginner developer looking to learn by example, or a professional wanting to speed up your workflow, knowing how to formulate an effective prompt makes all the difference between a generic snippet and production-ready code. The challenge is not simply to ask "write Python code", but to provide enough context — goal, constraints, style, error handling — so that Claude generates exactly what you need. A well-structured prompt allows you to obtain code that respects PEP 8 conventions, includes type hints, handles edge cases, and integrates naturally into your existing project. In this guide, you will find an optimized main prompt as well as variants adapted to each level of expertise to get the most out of Claude in your Python projects.

The prompt

Claude

You are a senior Python developer with 15 years of experience. Generate Python code for [DESCRIBE YOUR FEATURE HERE] while respecting these requirements:

Goal: [Describe precisely what the code should do]
Inputs: [Data types and formats for input data]
Outputs: [Expected result, return format]
Constraints: Python 3.11+, PEP 8 compliance, mandatory type hints

Technical requirements:

Include Google-style docstrings for each function and class
Handle errors with specific exceptions (no bare except)
Add validations on user inputs
Use f-strings for formatting
Prioritize readability over excessive conciseness

Structure the code as follows:

Imports (standard library first, then third-party, then local)
Constants
Classes/Functions
if name == 'main' block with a usage example

After the code, provide:

A line-by-line explanation of complex parts
Dependencies to install via pip
3 test cases to validate proper operation

Personalize this prompt with Léa

Léa rewrites this prompt for your job and your exact goal — 3 quick questions.

Why it works

This prompt works because it assigns an expert role to Claude, activating its most advanced Python knowledge. The numbered section structure eliminates ambiguity and forces an organized response. Explicit technical requirements (PEP 8, type hints, docstrings) prevent Claude from taking shortcuts and guarantee professional-quality code.

Expected result

Claude generates a complete, structured Python script ready to use with type hints, detailed docstrings, and robust error handling. The code is accompanied by clear explanations of implementation choices, a list of required dependencies, and concrete test cases to immediately validate proper operation.

Variants by level

FAQ

How can I make Claude generate Python code compatible with a specific version?

Specify the exact Python version in your prompt (e.g., "Python 3.9 only"). Claude will automatically adapt the syntax: it will avoid pattern match/case (3.10+), type hints using | instead of Union (3.10+), or positional-only parameters (3.8+). You can also mention deployment constraints, such as "compatible with AWS Lambda runtime Python 3.9".

Can Claude generate Python code that uses third-party libraries like Pandas or TensorFlow?

Yes, Claude masters the entire Python ecosystem, including popular libraries like Pandas, NumPy, Scikit-learn, TensorFlow, PyTorch, FastAPI, Django, SQLAlchemy, and many others. For best results, specify the library version if important and describe your input data format. Claude will generate the code with appropriate imports and indicate the necessary pip install commands.

How do I ask Claude to refactor or improve existing Python code?

Paste your existing code in the prompt and explicitly ask for what you want to improve: performance, readability, security, adding tests, or updating to more modern syntax. Be specific, for example "Refactor this code to use dataclasses instead of dictionaries" or "Optimize this loop to process 1 million rows". Claude will explain each modification and why it improves the original code.

How to use this prompt

Copy the prompt with the button above.
Paste it into ChatGPT, Claude or your favorite AI assistant.
Replace the bracketed variables with your details, then refine the result.

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