parameters: (self, f, start=None, stop=None)
docstring: Initialize a _PartialFile.
docstring_summary: Initialize a _PartialFile.
docstring_tokens: Initialize a _PartialFile .
function: def __init__(self, f, start=None, stop=None):
          """Initialize a _PartialFile."""
          _ProxyFile.__init__(self, f, start)
          self._start = start
          self._stop = stop
function_tokens: def __init__ ( self , f , start = None , stop = None ) : _ProxyFile . __init__ ( self , f , start ) self . _start = start self . _stop = stop