Nick Coghlan <[email protected]> added the comment:
It occurs to me that there may be some additional unshared context here: the
way `python -m pip` searches for the module to execute is much closer to the
way Windows searches for a command like `pip` (i.e. current directory first)
than it is to the way *nix systems search for it (i.e. if the current directory
isn't on PATH it must be specified explicitly as "./pip"). If you spend a lot
of time on Windows systems, or working with Windows users, it becomes a habit
to assume that folks aren't going to expect it to be safe to run arbitrary
commands from arbitrary directories.
This behaviour means that if you want to intercept "python -m pip", the current
easiest filename to use to intercept it is just "pip.py", similar to the way
you can use "pip.exe" or "python.exe" to intercept those commands on Windows.
I do think switching from a Windows-style default search behaviour to a *nix
style default search behaviour is potentially reasonable, but the related
backwards compatibility considerations would likely push it into being a PEP
level change.
I'll also note that Nathaniel's right that I was wrong about `sitecustomize`
always being easy to intercept from the current directory, though, as
sys.path[0] gets set *after* "import site" has already executed.
I was just confusing myself, as my default approach to double-checking the
behaviour of the "-m" switch is to run "python -m site", but that's misleading
in this case since doing that *also* re-runs the site and user customisation
modules (and will pick them up from the current working directory) - it's
closely akin to testing `python3 -c "import runpy; runpy.run_module('site',
run_name='__main__')"`
----------
stage: -> needs patch
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<https://bugs.python.org/issue33053>
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