Mailing List Archive

bpo-34215: Clarify IncompleteReadError message when "expected" is None (GH-21925) (#23540)
https://github.com/python/cpython/commit/4498e98a6bdf017d3b65fa679baf4c797909beb6
commit: 4498e98a6bdf017d3b65fa679baf4c797909beb6
branch: 3.8
author: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
committer: asvetlov <andrew.svetlov@gmail.com>
date: 2020-11-28T16:44:34+02:00
summary:

bpo-34215: Clarify IncompleteReadError message when "expected" is None (GH-21925) (#23540)

Co-Authored-By: Tyler Bell <mrbell321@gmail.com>
(cherry picked from commit 8085f742f4adfbc85f13fc734dfab036aa23acfb)
Co-authored-by: Zackery Spytz <zspytz@gmail.com>

files:
A Misc/NEWS.d/next/Library/2020-08-19-20-17-51.bpo-34215._Cv8c-.rst
M Lib/asyncio/exceptions.py
M Lib/test/test_asyncio/test_streams.py

diff --git a/Lib/asyncio/exceptions.py b/Lib/asyncio/exceptions.py
index e03602ef57623..f07e448657738 100644
--- a/Lib/asyncio/exceptions.py
+++ b/Lib/asyncio/exceptions.py
@@ -34,8 +34,9 @@ class IncompleteReadError(EOFError):
- expected: total number of expected bytes (or None if unknown)
"""
def __init__(self, partial, expected):
+ r_expected = 'undefined' if expected is None else repr(expected)
super().__init__(f'{len(partial)} bytes read on a total of '
- f'{expected!r} expected bytes')
+ f'{r_expected} expected bytes')
self.partial = partial
self.expected = expected

diff --git a/Lib/test/test_asyncio/test_streams.py b/Lib/test/test_asyncio/test_streams.py
index 12bd536911dbb..84c031c71b6fd 100644
--- a/Lib/test/test_asyncio/test_streams.py
+++ b/Lib/test/test_asyncio/test_streams.py
@@ -452,12 +452,14 @@ def test_readuntil_multi_chunks_1(self):

def test_readuntil_eof(self):
stream = asyncio.StreamReader(loop=self.loop)
- stream.feed_data(b'some dataAA')
+ data = b'some dataAA'
+ stream.feed_data(data)
stream.feed_eof()

- with self.assertRaises(asyncio.IncompleteReadError) as cm:
+ with self.assertRaisesRegex(asyncio.IncompleteReadError,
+ 'undefined expected bytes') as cm:
self.loop.run_until_complete(stream.readuntil(b'AAA'))
- self.assertEqual(cm.exception.partial, b'some dataAA')
+ self.assertEqual(cm.exception.partial, data)
self.assertIsNone(cm.exception.expected)
self.assertEqual(b'', stream._buffer)

diff --git a/Misc/NEWS.d/next/Library/2020-08-19-20-17-51.bpo-34215._Cv8c-.rst b/Misc/NEWS.d/next/Library/2020-08-19-20-17-51.bpo-34215._Cv8c-.rst
new file mode 100644
index 0000000000000..4d91678948f40
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2020-08-19-20-17-51.bpo-34215._Cv8c-.rst
@@ -0,0 +1,2 @@
+Clarify the error message for :exc:`asyncio.IncompleteReadError` when
+``expected`` is ``None``.

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