New submission from Mike Kaganski <mikekagan...@hotmail.com>:

Using cyqwin 3.3.4-2, and python3:

Python 3.9.10 (main, Jan 20 2022, 21:37:52)
[GCC 11.2.0] on cygwin

Trying this bash command line:

> python3 C:/path/to/script.py

results in this error:

"python3: can't open file '/cygdrive/c/path/to/curdir/C:/path/to/script.py': 
[Errno 2] No such file or directory"

OTOH, calling it like

> python3 /cygdrive/c/path/to/script.py

gives the expected output:

"usage: script.py [-h] ..."

It seems that python3 doesn't recognize "C:/path/to/script.py" to be a proper 
full path under cygwin, while most other cygwin apps handle those fine. E.g.,

> nano C:/path/to/script.py

opens the script for editing without problems.

The mentioned path syntax is useful and supported under cygwin, so it would be 
nice if python3 could support it, too. Especially useful it is in mixed 
development environment, mixing Windows native tools and cygwin ones; using 
such path style allows to use same paths for both kinds of tools, simplifying 
scripts.

----------
components: Windows
messages: 413247
nosy: mikekaganski, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Windows-style path is not recognized under cygwin
type: behavior
versions: Python 3.9

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46751>
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