def read_body(response, max_bytes=None):
    """Return a `Deferred` yielding at most *max_bytes* bytes from the
    body of a Twisted Web *response*, or the whole body if *max_bytes*
    is `None`."""
    finished = Deferred()
    response.deliverBody(TruncatingReadBodyProtocol(
        response.code, response.phrase, finished, max_bytes))
    return finished
def read_body ( response , max_bytes = None ) : finished = Deferred ( ) response . deliverBody ( TruncatingReadBodyProtocol ( response . code , response . phrase , finished , max_bytes ) ) return finished
Return a `Deferred` yielding at most *max_bytes* bytes from the
    body of a Twisted Web *response*, or the whole body if *max_bytes*
    is `None`.