Why Does My Python Package Install Successfully from PyPI but Fail from TestPyPI?

Pip Install from PyPI Success but Failure from TestPyPI: Missing Requirements

Problem:

When attempting to install a newly created Python package from testpypi.python.org, the pip installation fails with errors citing missing requirements, even though the package was successfully uploaded.

Answer:

To resolve this issue, specify both --index-url and --extra-index-url while installing the package from testpypi:

python -m pip install --index-url https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple poirot

Explanation:

• --index-url directs pip to the package on testpypi.
• --extra-index-url instructs pip to search for dependencies on regular pypi.
• poirot is the name of the package being installed.

Note:

This solution addresses the immediate issue, but it can be unsafe in certain situations, especially on private servers. Refer to sources like [A. Sottile's video](https://www.youtube.com/watch?v=YdFKo9s92QA) for guidance on using --extra-index-url responsibly and understanding potential risks.

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