eryksun added the comment:
My suggestion is only for 3.5 / 3.6, because Windows XP is no longer supported.
Starting with Windows Vista, both cmd.exe and CreateProcess support this
behavior. I realize that disabling searching the current director by default is
going beyond what cmd.exe does, which is to require opting in via the
environment variable. But Python can choose to follow the more-modern behavior
of PowerShell as a precedent here.
As Steve mentioned, technically a program isn't supposed to check for the
environment variable, but instead call NeedCurrentDirectoryForExePath. This
would require either adding a built-in function, e.g. to the _winapi module, or
require ctypes:
>>> kernel32.NeedCurrentDirectoryForExePathW('command')
1
>>> os.environ['NoDefaultCurrentDirectoryInExePath'] = '1'
>>> kernel32.NeedCurrentDirectoryForExePathW('command')
0
Note that it requires first normalizing the path to replace slashes with
backslashes, which is unusual for the Windows API.
>>> kernel32.NeedCurrentDirectoryForExePathW(r'.\command')
1
>>> kernel32.NeedCurrentDirectoryForExePathW('./command')
0
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