Fix Python – Split a string at uppercase letters

Question

What is the pythonic way to split a string before the occurrences of a given set of characters?

For example, I want to split
'TheLongAndWindingRoad'
at any occurrence of an uppercase letter (possibly except the first), and obtain
['The', 'Long', 'And', 'Winding', 'Road'].

Edit: It should also split single occurrences, i.e.
from 'ABC' I’d like to obtain
['A', 'B', 'C'].

Now we will see solution for issue: Split a string at uppercase letters

Answer

Unfortunately it’s not possible to split on a zero-width match in Python. But you can use re.findall instead:

>>> import re
>>> re.findall('[A-Z][^A-Z]*', 'TheLongAndWindingRoad')
['The', 'Long', 'And', 'Winding', 'Road']
>>> re.findall('[A-Z][^A-Z]*', 'ABC')
['A', 'B', 'C']

This question is answered By – Mark Byers

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