Terry J. Reedy <[email protected]> added the comment:
While I have no specific opinion on tarfile, I strongly disagree with a blanket
prohibition on 'from None'. Its proper use is to maintain a defined API and
hide irrelevant implementation details. Realistic toy example:
def f(x, y):
"Return (x+y)/y for non-zery y."
if y == 0: # Body 1: look ahead.
raise ValueError('y cannot be 0')
else:
return (x+y)/y
# or
try: # Body 2: leap first.
return (x+y)/y
except ZeroDivisionError:
raise ValueError('y cannot be 0') from None
'from e' instead of 'from None' would just add distracting noise.
----------
nosy: +terry.reedy
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Python tracker <[email protected]>
<https://bugs.python.org/issue39717>
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