How to Split CamelCase Strings in Python: 5 Practical Methods

In a recent Python community discussion, a user asked how to transform a CamelCase string like "WeLovePython" into a space‑separated, properly capitalized sentence such as "We love python".

1. Introduction

The original text shows the desired transformation and explains that the first character should remain uppercase while the rest become lowercase.

2. Implementation

Several solutions were shared.

First approach iterates over each character, inserts a space before uppercase letters, then trims the leading space.

# coding:utf-8
# @Time : 2022/5/4 11:46
# @Author: PiPi
text = "WeLovePython"
res = ''.join([" " + i if i.isupper() else i for i in text]).strip()
print(res)

This produces "We LovePython". To also lowercase the rest of the letters, an additional step is added:

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

Another variant builds the result directly and then applies .lower() and .capitalize():

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)

A regular‑expression solution was also presented:

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

Each method ultimately yields the desired output "We love python".

3. Summary

The article reviews five different ways to split and reformat CamelCase strings in Python, all based on detecting uppercase letters and inserting spaces, with variations in how the final capitalization is handled.