Andrew Svetlov schrieb am 13.06.2015 um 08:30:
> I have an issue in aiohttp library:
> https://github.com/KeepSafe/aiohttp/issues/410
>
> The source of problem is: when I execute the following code
>
> body = ', '.join("'{}': {!r}".format(k, v) for k, v in self.items())
>
> in except block Cython clears exception.
>
> Changing from comprehension to regular iteration works well:
>
> lst = []
> for k, v in self._items:
> lst.append("'{}': {!r}".format(k, v))
> body = ', '.join(lst)
>
> In pyre Python both versions don't clear current exception.
Thanks for the report, I can reproduce it with this code:
'''
def genexpr_in_except(x, result):
"""
>>> result = []
>>> try: genexpr_in_except([1, 2, 3], result)
... except ValueError: print("OK")
... else: print("NOT RAISED!")
OK
>>> result
[2, 4, 6]
>>> result = []
>>> genexpr_in_except([], result)
>>> result
[]
"""
try:
if x:
raise ValueError()
except ValueError:
assert sys.exc_info()[0] is ValueError, 1
result[:] = list(i*2 for i in x)
assert sys.exc_info()[0] is ValueError, 2
raise
'''
The "raise" at the end actually works, but the second "assert" makes it fail.
Stefan
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