903             read1 = read  variable in IOTest.test_buffered_readinto_mixin.Stream
957             def read1(self, size):  member in IOTest.test_BufferedIOBase_readinto.Reader
1275         self.assertEqual(b"b", bufio.read1(1))
1277         self.assertEqual(b"", bufio.read1(0))
1278         self.assertEqual(b"c", bufio.read1(100))
1280         self.assertEqual(b"d", bufio.read1(100))
1282         self.assertEqual(b"efg", bufio.read1(100))
1284         self.assertEqual(b"", bufio.read1(100))
1291         self.assertEqual(b"bc", bufio.read1())
1292         self.assertEqual(b"d", bufio.read1())
1293         self.assertEqual(b"efg", bufio.read1(-1))
1295         self.assertEqual(b"", bufio.read1())
1522         self.assertRaises(ValueError, b.read1, 1)
1987         self.assertEqual(pair.read1(3), b"abc")
1988         self.assertEqual(pair.read1(), b"def")
2261             bufio.read1(1)
2335                 self.assertEqual(f.read1(1), b'd')
3669     def read1(self, len_):  member in MemviewBytesIO
3670         return _to_memoryview(super().read1(len_))
3949                 self.assertRaises(ValueError, f.read1, 1024)
3950                 self.assertRaises(ValueError, f.read1)