Ethan Furman added the comment:
Empty strings are empty strings, not None.
An better way for your code example would be:
def ...():
if url:
....
else:
raise URLError(...URL cannot be empty...)
----------
nosy: +ethan.furman
resolution: -> not a bug
stage: -> resolved
status: open -> closed
type: -> behavior
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<http://bugs.python.org/issue28072>
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