Message282946
The following code raises MemoryError instead of creating an empty list:
# START
import sys
class CustomIter:
def __iter__(self):
return self
def __next__(self):
raise StopIteration
def __length_hint__(self):
return sys.maxsize
l = list(CustomIter())
#END
That's because this empty iterator has a __length_hint__ that claims it returns a very large number of methods.
The function listextend in Objects/listobject.c already ignores __length_hint__() when using it would overflow the size of the list, it would IMHO also be better to ignore the length hint when the attempt to resize fails as __length_hint__() is documented as a hint that may be incorrect. |
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Date |
User |
Action |
Args |
2016-12-11 20:53:16 | ronaldoussoren | set | recipients:
+ ronaldoussoren |
2016-12-11 20:53:16 | ronaldoussoren | set | messageid: <1481489596.88.0.223371500433.issue28940@psf.upfronthosting.co.za> |
2016-12-11 20:53:16 | ronaldoussoren | link | issue28940 messages |
2016-12-11 20:53:16 | ronaldoussoren | create | |
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