New submission from Stéphane Henriot:
A few days ago, the following behavior surprised me.
>>> "".replace("", "prefix", 1)
''
>>> "".replace("", "prefix")
'prefix'
It seems to me this edge case isn't correctly documented/implemented. I tested
with python 2.7, 3.4 and 3.5, I guess it applies for other versions as well.
Here are a few elements, for reference.
« string.replace(s, old, new[, maxreplace])
Return a copy of string s with all occurrences of substring old replaced by
new. If the optional argument maxreplace is given, the first maxreplace
occurrences are replaced. »
>>> "" in ""
True
>>> "".count("")
1
>>> "".find("")
0
https://hg.python.org/cpython/file/2.7/Objects/stringobject.c#l2750
https://hg.python.org/cpython/file/default/Objects/unicodeobject.c#l10479
Thanks,
Stéphane.
----------
messages: 275140
nosy: Stéphane Henriot
priority: normal
severity: normal
status: open
title: Replace and empty strings
type: behavior
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Python tracker <[email protected]>
<http://bugs.python.org/issue28029>
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