450     def read(self, amt=None):  argument
459             return self._read_chunked(amt)
461         if amt is not None:
462             if self.length is not None and amt > self.length:
464                 amt = self.length
465             s = self.fp.read(amt)
466             if not s and amt:
577     def _read_chunked(self, amt=None):  argument
586                 if amt is not None and amt <= chunk_left:
587                     value.append(self._safe_read(amt))
588                     self.chunk_left = chunk_left - amt
592                 if amt is not None:
593                     amt -= chunk_left
623     def _safe_read(self, amt):  argument
630         data = self.fp.read(amt)
631         if len(data) < amt:
632             raise IncompleteRead(data, amt-len(data))
637         amt = len(b)
639         if n < amt:
640             raise IncompleteRead(bytes(b[:n]), amt-n)