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from itertools import product

...
    words = inputstring.split()
    for combo in product(' -', repeat=len(words) - 1):
        yield ''.join(w for pair in zip(words, combo + ('',)) for w in
+ pair)

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'convert perl-to python'
'convert-perl to python'
'convert perl-to-python'
'convert-perl-to python'
'convert-perl-to-python'