709     def read1(self, size=-1):  member in BufferedIOBase
727         return self._readinto(b, read1=False)
738         return self._readinto(b, read1=True)
740     def _readinto(self, b, read1):  argument
745         if read1:
746             data = self.read1(len(b))
942     def read1(self, size=-1):  member in BytesIO
1142     def read1(self, size=-1):  member in BufferedReader
1160     def _readinto(self, buf, read1):  argument
1196                 elif not (read1 and written):
1201                 if read1 and written:
1368     def read1(self, size=-1):  member in BufferedRWPair
1369         return self.reader.read1(size)
1454     def read1(self, size=-1):  member in BufferedRandom
1456         return BufferedReader.read1(self, size)
2279             input_chunk = self.buffer.read1(self._CHUNK_SIZE)