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Origins

The first version of Python, version 1.2, was released in 1991. This initial version was developed by Guido van Rossum, who worked at the National Research Institute for Mathematics and Computer Science in the Netherlands. Python 1.2 was a basic interpreter with a limited set of features, but it laid the foundation for future versions.

Declares dependency requirements and package metadata (e.g., requires-python = ">=3.10" ). pip , poetry , uv , hatch

cd my_project echo "3.10.13" > .python-version pyenv local # prints "3.10.13" python --version # shows Python 3.10.13 cd .. python --version # back to global default

Use requirements.txt for across environments.

Generate a requirements.txt with exact pinned versions:

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