Question

I have a string which contains a fixed character. Can I generate a permutation of strings by replacing it with another character or string??
Say, I have something like this:

designatedstring="u"
replacerstring="ough"
s="thruput"

I want an output like:

l=["throughput","thrupought","throughpought"]

Is there any way to do this?

Answer 1

More itertools sugar:

>>> parts = s.split(designatedstring)
>>> num = len(parts) - 1
>>> replacements = itertools.product([designatedstring, replacerstring], repeat=num)
>>> replacements = list(replacements)
>>> replacements.remove((designatedstring,) * num)
>>> for r in replacements:
...     print ''.join(itertools.chain(*zip(parts, r + ('',))))
...
thrupought
throughput
throughpought

If you can bear with original string in the result, you can omit ugly transformations on 4 and 5 lines.