How do I make numbers come out in like the alphabetical form in Python

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Python

Python2.2

Python2.3

, +

for instance:(["one", 4, "three", 7]) would come out like:[1,4,3,7]

What I have tried:

def digits(lst):
digits=['two','seven','three','five']
for c in '2735':
s = s.replace(c, digits(int(s)))
return s