New submission from Nathaniel Smith:
The following code prints "KeyError()", which is obviously wrong and rather
baffling. Just passing an exception object around *as an object* should not
trigger implicit exception chaining!
If you replace the async functions with regular functions then it prints
"None", as expected.
Checked on 3.5, 3.6, and more-or-less current master -- bug is present in all 3.
------------
async def f():
return ValueError()
async def g():
try:
raise KeyError
except:
value_error = await f()
print(repr(value_error.__context__))
try:
g().send(None)
except StopIteration:
pass
----------
components: Interpreter Core
messages: 288133
nosy: njs
priority: normal
severity: normal
status: open
title: Returning an exception object from a coroutine triggers implicit
exception chaining?!?
versions: Python 3.5, Python 3.6, Python 3.7
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Python tracker <[email protected]>
<http://bugs.python.org/issue29600>
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