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From: eryk sun <eryksun@gmail.com>
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Subject: Re: pip install mitmproxy - fails on watchdog-0.8.3.tar.gz with "Permission denied" error (Python 2.7.11 on Win XP SP3);
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Xref: csiph.com comp.lang.python:102138

 On Sun, Jan 24, 2016 at 7:27 PM, Terry Reedy <tjreedy@udel.edu> wrote:
>
> More specifically, / is not accepted in paths to be executed. It seems to be
> generally accepted in path arguments, as in cd path, or
>
> C:\Users\Terry>C:\programs\python35\python.exe C:/programs/python34/tem.py

An exception that comes to mind is takeown.exe, which fails to parse
paths that use slash as the value for /F.

A couple of exceptional cases in the Windows API come to mind. The
"\\?\" extended path syntax requires backslash. Also referencing named
kernel objects requires a backslash after either the "Global" prefix
or a private namespace prefix. For example, in "Global/ObjectName" the
slash is just another character in the name, so the object manager
doesn't follow the "Global" symbolic link to \BaseNamedObjects but
instead creates"Global/ObjectName" in the session's named objects
directory.