Serhiy Storchaka <[email protected]> added the comment:
There are expected some relations between str methods. For example,
s.replace(a, b, n) == s.replace(a, b) if n >= s.count(a)
len(s.replace(a, b, n)) == len(s) + (len(b)-len(a)) * n if 0 <= n <=
s.count(a)
len(s.replace(a, b, n)) == len(s) + (len(b)-len(a)) * s.count(a) if n >=
s.count(a)
Inconsistency between "".replace("", s, n) and "".replace("", s) is just a bug,
and it should be fixed in the most consistent way. There are precedences, the
behavior of replace() already was changed 3 times in the past. I think that
chances to break some code are tiny, we just fix inconsistency why can puzzle
users.
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<https://bugs.python.org/issue28029>
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