Why Does My pip Install Fail from TestPyPI, and How Can I Fix Missing Dependencies?

Pip Install Failure from TestPyPI: Missing Requirements

When attempting to install a Python package from TestPyPI, you may encounter an error stating that required dependencies, such as tqdm and Jinja2, cannot be found. This is because TestPyPI may not host these dependencies, unlike the main PyPI repository.

To resolve this issue, you can either:

1. Provide Dependency Locations:

• Specify explicit versions of tqdm and Jinja2 in your setup.py file:

setup(
    ...,
    install_requires=['tqdm==3.4.0', 'Jinja2==2.8'],
    ...,
)

• Upload both your package and its dependencies to TestPyPI.

2. Use Extra Index URL:

• Use the --extra-index-url flag when installing from TestPyPI:

pip install --extra-index-url https://testpypi.python.org/pypi poirot

This flag directs pip to additionally search the main PyPI repository for dependencies that are not found on TestPyPI.

3. Update PyPI Site (For Recent PyPI Versions):

• Replace the --extra-index-url flag with --index-url and --extra-index-url as follows:

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

• Remember that using --extra-index-url can introduce security risks, so proceed with caution.

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