Anthony Sottile <asott...@umich.edu> added the comment:

I did my best to classify those on pypi that were using `.pth` files.  My 
initial search had quite a few false positives (and now that I look at it, 
completely missed `.zip`-based source distributions so there's likely some 
false negatives as well)

Here's the summary of the categorizations:

$ cut -d, -f2 < data.csv | sort | uniq -c
      2 backport
      4 coverage
      4 debugging
      2 demo
      9 encoding
      7 except-hook
     58 false-positive
      6 import-hook
     20 module-layout
     20 monkeypatch


I realized about halfway through that "monkeypatch" was probably too broad of a 
category but continued with that through all of them, the monkeypatch category 
contains a few classes of things: fixing third party libraries, disabling ssl 
(yikes!), adding some "features" to builtins / stdlib modules -- which 
unfortunately I didn't really classify properly.

There was a single .pth file that I deemed "malicious" since it completely 
breaks the `subprocess` module (`subprocess-run`) but other than that they all 
seemed ~mostly not the worst.

A lot of the `module-layout` ones could be solved with things provided directly 
by `setuptools`, or just be rearranging their distribution's files.

The raw data is available in csv: 
https://github.com/asottile/pth-file-investigation/blob/master/data.csv

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