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Code Issues Projects Releases Packages Wiki Activity Actions 11

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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8
Lib/warnings.py
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@ -209,7 +209,7 @@ def _setoption(arg):
if lineno < 0:
raise ValueError
except (ValueError, OverflowError):
raise _OptionError("invalid lineno %r" % (lineno,))
raise _OptionError("invalid lineno %r" % (lineno,)) from None
else:
lineno = 0
filterwarnings(action, message, category, module, lineno)
@ -233,7 +233,7 @@ def _getcategory(category):
try:
cat = eval(category)
except NameError:
raise _OptionError("unknown warning category: %r" % (category,))
raise _OptionError("unknown warning category: %r" % (category,)) from None
else:
i = category.rfind(".")
module = category[:i]
@ -241,11 +241,11 @@ def _getcategory(category):
try:
m = __import__(module, None, None, [klass])
except ImportError:
raise _OptionError("invalid module name: %r" % (module,))
raise _OptionError("invalid module name: %r" % (module,)) from None
try:
cat = getattr(m, klass)
except AttributeError:
raise _OptionError("unknown warning category: %r" % (category,))
raise _OptionError("unknown warning category: %r" % (category,)) from None
if not issubclass(cat, Warning):
raise _OptionError("invalid warning category: %r" % (category,))
return cat