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Document -diff where people read about wppm
The tour covers -ls, -tl, -p, -r, -j, -t and -ws with worked examples, and -diff exists precisely because a feature nobody can find is a feature that is not there. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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‎README_PYPI.md‎

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{'numpy': ['pandas']}
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```
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## Comparing two package lists
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`-md` writes a package index. `-diff` compares two:
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```console
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$ wppm -diff WinPythonslim-64bit-3.13.5.0.md WinPythonslim-64bit-3.14.7.0.md
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## Changes from WinPythonslim-64bit-3.13.5.0 to WinPythonslim-64bit-3.14.7.0
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### Python packages
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New packages:
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* aiofile 3.9.0 (Asynchronous file operations.)
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Upgraded packages:
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* numpy 2.2.6 → 2.5.2 (Fundamental package for array computing in Python)
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Removed packages:
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* astropy 6.1.6 (Astronomy and astrophysics core library)
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```
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Any two indexes, in any order: two releases a year apart, or two flavors of the same
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one. No distribution is involved, so two downloaded files are enough. WinPython
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publishes one index per release and flavor, in
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[changelogs/](https://github.com/winpython/winpython/tree/master/changelogs).
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## Environments you have not installed anything into
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`-t` points `wppm` at *another* Python distribution, and `-ws` at a plain directory of

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