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gh-127647: Add typing.Reader and Writer protocols (#127648)

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Sebastian Rittau 2025-03-06 16:36:19 +01:00 • committed by GitHub
parent 9c691500f9
commit c6dd2348ca
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9 changed files with 192 additions and 9 deletions
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18
Lib/test/test_io.py
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@ -4916,6 +4916,24 @@ class PySignalsTest(SignalsTest):
test_reentrant_write_text = None
class ProtocolsTest(unittest.TestCase):
class MyReader:
def read(self, sz=-1):
return b""
class MyWriter:
def write(self, b: bytes):
pass
def test_reader_subclass(self):
self.assertIsSubclass(MyReader, io.Reader[bytes])
self.assertNotIsSubclass(str, io.Reader[bytes])
def test_writer_subclass(self):
self.assertIsSubclass(MyWriter, io.Writer[bytes])
self.assertNotIsSubclass(str, io.Writer[bytes])
def load_tests(loader, tests, pattern):
tests = (CIOTest, PyIOTest, APIMismatchTest,
CBufferedReaderTest, PyBufferedReaderTest,