9.7. File System
Access to your file system occurs mostly through the Python os module. This module serves as the primary interface to your operating system facilities and services from Python. The os module is actually a front-end to the real module that is loaded, a module that is clearly operating system-dependent. This “real” module may be one of the following: posix (Unix), nt (Windows), mac (Macintosh), dos (DOS), os2 (OS/2), etc. You should never import those modules directly. Just import os and the appropriate module will be loaded, keeping all the underlying work hidden from sight. Depending on what your system supports, you may not have access to some of the attributes which may be available in other operating system modules.
In addition ...
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