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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/difflib.py
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@ -2079,7 +2079,7 @@ def restore(delta, which):
tag = {1: "- ", 2: "+ "}[int(which)]
except KeyError:
raise ValueError('unknown delta choice (must be 1 or 2): %r'
% which)
% which) from None
prefixes = (" ", tag)
for line in delta:
if line[:2] in prefixes: