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[3.15] gh-160596: Fix error message in asyncio.proactor_events.sendto() (GH-160597) #160602

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[3.15] gh-160596: Fix error message in asyncio.proactor_events.sendto() (GH-160597) #160602

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4 changes: 2 additions & 2 deletions Lib/asyncio/proactor_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -489,8 +489,8 @@ def _force_close(self, exc):

def sendto(self, data, addr=None):
if not isinstance(data, (bytes, bytearray, memoryview)):
raise TypeError('data argument must be bytes-like object (%r)',
type(data))
raise TypeError(f'data argument must be a bytes-like object, '
f'not {type(data).__name__!r}')

if self._address is not None and addr not in (None, self._address):
raise ValueError(
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4 changes: 3 additions & 1 deletion Lib/test/test_asyncio/test_proactor_events.py
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Original file line number Diff line number Diff line change
Expand Up @@ -691,7 +691,9 @@ def test_sendto_error_received_connected(self):

def test_sendto_str(self):
transport = self.datagram_transport()
self.assertRaises(TypeError, transport.sendto, 'str', ())
self.assertRaisesRegex(
TypeError, "^data argument must be a bytes-like object, not 'str'$",
transport.sendto, 'str', ())

def test_sendto_connected_addr(self):
transport = self.datagram_transport(address=('0.0.0.0', 1))
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2026-10-24-22-32-23.gh-issue-160596.RKll-Z.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Fix the error message for invalid data passed to
:meth:`!asyncio.proactor_events.sendto`.
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