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4 changes: 4 additions & 0 deletions Doc/library/shutil.rst
Original file line number Diff line number Diff line change
Expand Up @@ -454,6 +454,10 @@ Directory and files operations
:envvar:`PATH` environment variable is read from :data:`os.environ`,
falling back to :data:`os.defpath` if it is not set.

If *cmd* contains a directory component, :func:`!which` only checks the
specified path directly and does not search the directories listed in
*path* or in the system's :envvar:`PATH` environment variable.

On Windows, the current directory is prepended to the *path* if *mode* does
not include ``os.X_OK``. When the *mode* does include ``os.X_OK``, the
Windows API ``NeedCurrentDirectoryForExePathW`` will be consulted to
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