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bpo-29762: More use "raise from None". (#569)

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This hides unwanted implementation details from tracebacks.
This commit is contained in:
Serhiy Storchaka 2017-04-05 09:37:24 +03:00 • committed by GitHub
parent 43ba8861e0
commit 5affd23e6f
30 changed files with 50 additions and 48 deletions
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2
Lib/_weakrefset.py
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@ -98,7 +98,7 @@ class WeakSet:
try:
itemref = self.data.pop()
except KeyError:
raise KeyError('pop from empty WeakSet')
raise KeyError('pop from empty WeakSet') from None
item = itemref()
if item is not None:
return item