[issue28029] Replace and empty strings

[STINNER Victor]

STINNER Victor <vstinner at python.org> added the comment:

The current behavior is really surprising.

>>> "".replace("", "|")
'|'
>>> "".replace("", "|", -1)
'|'

vs

>>> "".replace("", "|", 0)
''
>>> "".replace("", "|", 1)
''
>>> "".replace("", "|", 1000)
''

I always expect "|".

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This behavior makes sense to me:

>>> "abc".replace("", "|")
'|a|b|c|'
>>> "abc".replace("", "|", -1)
'|a|b|c|'
>>> "abc".replace("", "|", 0)
'abc'
>>> "abc".replace("", "|", 1)
'|abc'
>>> "abc".replace("", "|", 100)
'|a|b|c|'

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue28029>
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