Programming Language Tools

Python Requirements Generator

Build a requirements.txt file from package names and version constraints.

Add your packages and version constraints - this tool generates a clean requirements.txt file.

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Prefer pinning exact versions (==) for reproducible deployments, and looser constraints (>=, ~=) for libraries meant to be flexible for consumers.

What Is requirements.txt?

A requirements.txt file lists the Python packages (and optionally version constraints) a project depends on, installed with pip install -r requirements.txt.

Why Use This Tool?

Manually keeping a requirements file properly formatted and alphabetized across a growing dependency list gets tedious - this tool assembles a clean, consistent file from your package list.

How to Use It

Add each package name and its version constraint (e.g. ==2.31.0, >=1.0, or leave blank for unpinned).
Copy the generated requirements.txt content.

Limitations

This generates the requirements file text only - it does not verify that a package name actually exists on PyPI or that the specified version is real; see the Python Package Name Checker for basic name-syntax validation.

Frequently Asked Questions

Run pip install -r requirements.txt, ideally inside a virtual environment (python -m venv .venv).

For applications, pinning with == gives reproducible installs. For libraries, use ranges like >=1.2,<2 so users are not forced onto one exact version.

pip freeze lists every installed package, including indirect dependencies. This tool lets you write just the packages you choose, with your own constraints.