chmod

Change the access permissions of a file.

  path
    Path to be modified.  May always be specified as a str, bytes, or
    a path-like object.  On some platforms, path may also be specified
    as an open file descriptor.  If this functionality is unavailable,
    using it raises an exception.
  mode
    Operating-system mode bitfield.
    Be careful when using number literals for *mode*. The conventional
    UNIX notation for numeric modes uses an octal base, which needs to
    be indicated with a ``0o`` prefix in Python.
  dir_fd
    If not None, it should be a file descriptor open to a directory,
    and path should be relative; path will then be relative to that
    directory.
  follow_symlinks
    If False, and the last element of the path is a symbolic link,
    chmod will modify the symbolic link itself instead of the file
    the link points to.

It is an error to use dir_fd or follow_symlinks when specifying path as
  an open file descriptor.
dir_fd and follow_symlinks may not be implemented on your platform.
  If they are unavailable, using them will raise a NotImplementedError.