How to Split CamelCase Strings into Readable Words in Python

Introduction

In a recent Python community discussion, a user asked how to convert a CamelCase string such as "WeLovePython" into a spaced sentence where the first word starts with a capital letter and the rest are lowercase.

Implementation

Several solutions were shared.

# coding:utf-8

text = "WeLovePython"
res = ''.join([" " + i if i.isupper() else i for i in text]).strip()
print(res)

This code inserts a space before each uppercase letter and then removes the leading space, producing "We Love Python". However, it leaves the original capitalization.

text = "WeLovePython"
res = ''.join([" " + i if i.isupper() else i for i in text]).strip()
print(res)
b = res[0] + ''.join([i.lower() for i in res[1:]])
print(b)

The second snippet adds a step that keeps the first character unchanged and lowercases the rest, yielding "We love python".

text = "WeLovePython"
res = text[0] + ''.join([" " + i if i.isupper() else i for i in text[1:]]).lower()
print(res)

res = ''.join([" " + i if i.isupper() else i for i in text]).strip().capitalize()
print(res)

Another approach uses a similar loop but applies lower() to all characters after the first one.

text = "WeLovePython"
res = ''.join([" " + i if i.isupper() else i for i in text]).strip()
res1 = res[:1] + res[1:].lower()
print(res1)

A regex‑based solution was also provided:

import re

text = "WeLovePython"
result = re.sub(r'\w[A-Z]', lambda x: ' '.join(x.group(0).lower()), text)
print(result)

This uses a regular expression to find a lowercase‑uppercase pattern and replace it with a space followed by the lowercase version.

Conclusion

The article presents five methods that all achieve the same goal: splitting a CamelCase string into separate words with appropriate capitalization. Readers are encouraged to try these approaches and share alternative solutions.