Question

>>> import string
>>> word = "hello."
>>> word2 = word.replace(string.lowercase, '.')
>>> print word2
hello.

I just want all the lowercase letters to turn into full stops.

What am I doing wrong here?

Answer 1

Use a regular expression:

from re import sub

print sub("[a-z]", '.', "hello.")

str.replace is looking for the string abcdefghijklmnopqrstuvwxyz to replace it with ., not looking for each individual letter to replace.