New submission from Ned Batchelder <n...@nedbatchelder.com>:
Python 3.9 traces this code incorrectly. Note: 3.8 and 3.10 are correct, only
3.9 gets it wrong.
-----------------------------------
import linecache, sys
def trace(frame, event, arg):
# The weird globals here is to avoid a NameError on shutdown...
if frame.f_code.co_filename == globals().get("__file__"):
lineno = frame.f_lineno
print("{} {}: {}".format(event[:4], lineno, linecache.getline(__file__,
lineno).rstrip()))
return trace
import asyncio
async def async_gen():
yield 13
async def async_test():
global a
a = 17
async for i in async_gen():
print(i + 19)
else:
a = 21
print(sys.version)
sys.settrace(trace)
asyncio.run(async_test())
assert a == 21
----------------------------------
The starred line shows a trace of a statement that is not executed:
3.9.6 (default, Jul 13 2021, 07:21:14)
[Clang 12.0.0 (clang-1200.0.32.29)]
call 15: async def async_test():
line 17: a = 17
line 18: async for i in async_gen():
call 12: async def async_gen():
line 13: yield 13
retu 13: yield 13
exce 18: async for i in async_gen():
line 19: print(i + 19)
32
line 18: async for i in async_gen():
call 13: yield 13
retu 13: yield 13
exce 18: async for i in async_gen():
* line 19: print(i + 19)
line 21: a = 21
retu 21: a = 21
----------
components: Interpreter Core
keywords: 3.9regression
messages: 397393
nosy: Mark.Shannon, nedbat
priority: normal
severity: normal
status: open
title: Python 3.9 traces async for/else incorrectly
type: behavior
versions: Python 3.9
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue44621>
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