735     def read1(self, size=-1):  member in BufferedIOBase
753         return self._readinto(b, read1=False)
764         return self._readinto(b, read1=True)
766     def _readinto(self, b, read1):  argument
771         if read1:
772             data = self.read1(len(b))
971     def read1(self, size=-1):  member in BytesIO
1171     def read1(self, size=-1):  member in BufferedReader
1189     def _readinto(self, buf, read1):  argument
1225                 elif not (read1 and written):
1230                 if read1 and written:
1397     def read1(self, size=-1):  member in BufferedRWPair
1398         return self.reader.read1(size)
1483     def read1(self, size=-1):  member in BufferedRandom
1485         return BufferedReader.read1(self, size)
2313             input_chunk = self.buffer.read1(self._CHUNK_SIZE)