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Strings & text

Format, split, join, parse, and clean text — everyday Python string patterns.

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Strings & text easy

How to Convert camelCase to snake_case in Python

Convert camelCase strings to snake_case using a simple Python function that inserts underscores before uppercase letters and lowercases everything.

strings camelcase snakecase
Python 
def camel_to_snake(s):
    result = ""
    for i, char in enumerate(s):
        if char.isupper() and i > 0:
            result += "_"
        result += char.lower()
    return result

if __name__ == "__main__":
    test_cases = ["camelCase", "helloWorld", "thisIsACoolExample", "already_snake", "UPPER"]
    for case i…
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This page collects strings & text snippets — short, copy-ready Python you can paste into our free online IDE and run without installing anything. Each sample includes a plain-English explanation and the full source code.

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Samples are quick reference — one concept per page. For step-by-step teaching, use our Python tutorials. To test yourself, try quizzes or coding challenges. Clean up style with the Python formatter.

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