[issue33944] Deprecate and remove pth files

[Anthony Sottile]

Anthony Sottile <asottile at umich.edu> added the comment:

> > There was a single .pth file that I deemed "malicious" since it
completely breaks the `subprocess` module (`subprocess-run`)
>
> It only seems to set an attribute. What's wrong with that? Does the early
import of subprocess cause problems?

It assigns `subprocess.run`, which is an api in python3.5+.  In those versions, `subprocess.check_*` is implemented in terms of `subprocess.run`.   The `subprocess.run` provided by that package has a different api than the stdlib one so any use of the subprocess module is broken just by having that package installed

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<https://bugs.python.org/issue33944>
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