Steven D'Aprano <steve+pyt...@pearwood.info> added the comment:
I don't have Python 3.7 available to me, but in 3.5 the behaviour of
u.startswith(v) with an empty v seems consistent to me:
py> "alpha".startswith("", 20, 30)
True
py> "alpha"[20:30].startswith("")
True
py> "".startswith("", 20, 30)
True
py> ""[20:30].startswith("")
True
So I can't see any inconsistency that might be fixed by always returning True
in the case v="", as that appears to already be the case.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31984>
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