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  - os.curdir is a string representing the current directory (always '.')
  - os.pardir is a string representing the parent directory (always '..')
  - os.sep is the (or a most common) pathname separator ('/' or '\\')
  - os.extsep is the extension separator (always '.')
  - os.altsep is the alternate pathname separator (None or '/')
  - os.pathsep is the component separator used in $PATH etc
  - os.linesep is the line separator in text files ('\r' or '\n' or '\r\n')
  - os.defpath is the default search path for executables
  - os.devnull is the file path of the null device ('/dev/null', etc.)

Programs that import and use 'os' stand a better chance of being
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    path segments of the old name will be pruned until either the
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    the names of the subdirectories in dirpath (excluding '.' and '..').
    filenames is a list of the names of the non-directory files in dirpath.
    Note that the names in the lists are just names, with no path components.
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    dirpath, do os.path.join(dirpath, name).

    If optional arg 'topdown' is true or not specified, the triple for a
    directory is generated before the triples for any of its subdirectories
    (directories are generated top down).  If topdown is false, the triple
    for a directory is generated after the triples for all of its
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    (e.g., via del or slice assignment), and walk will only recurse into the
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    topdown is false is ineffective, since the directories in dirnames have
    already been generated by the time dirnames itself is generated. No matter
    the value of topdown, the list of subdirectories is retrieved before the
    tuples for the directory and its subdirectories are generated.

    By default errors from the os.scandir() call are ignored.  If
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    will be called with one argument, an OSError instance.  It can
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    to abort the walk.  Note that the filename is available as the
    filename attribute of the exception object.

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    systems that support them.  In order to get this functionality, set the
    optional argument 'followlinks' to true.

    Caution:  if you pass a relative pathname for top, don't change the
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    changes the current directory, and assumes that the client doesn't
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    for root, dirs, files in os.walk('python/Lib/email'):
        print(root, "consumes", end="")
        print(sum([getsize(join(root, name)) for name in files]), end="")
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Execute file with arguments from args in a subprocess.
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