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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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4
Lib/shutil.py
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@ -786,7 +786,7 @@ def make_archive(base_name, format, root_dir=None, base_dir=None, verbose=0,
try:
format_info = _ARCHIVE_FORMATS[format]
except KeyError:
raise ValueError("unknown archive format '%s'" % format)
raise ValueError("unknown archive format '%s'" % format) from None
func = format_info[0]
for arg, val in format_info[1]:
@ -962,7 +962,7 @@ def unpack_archive(filename, extract_dir=None, format=None):
try:
format_info = _UNPACK_FORMATS[format]
except KeyError:
raise ValueError("Unknown unpack format '{0}'".format(format))
raise ValueError("Unknown unpack format '{0}'".format(format)) from None
func = format_info[1]
func(filename, extract_dir, **dict(format_info[2]))