(self)
return set(k for k, v in self._required_directories.items() if v > 0)
Return the set of directories required by the paths in the container,
        in no particular order.  The returned directories are relative to an
        unspecified (virtual) root directory (and do not include said root
        directory).
Return the set of directories required by the paths in the container,
        in no particular order.  The returned directories are relative to an
        unspecified (virtual) root directory (and do not include said root
        directory).
Return the set of directories required by the paths in the container in no particular order . The returned directories are relative to an unspecified ( virtual ) root directory ( and do not include said root directory ) .
def required_directories(self):
        '''
        Return the set of directories required by the paths in the container,
        in no particular order.  The returned directories are relative to an
        unspecified (virtual) root directory (and do not include said root
        directory).
        '''
        return set(k for k, v in self._required_directories.items() if v > 0)
def required_directories ( self ) : return set ( k for k , v in self . _required_directories . items ( ) if v > 0 )