Reference library

Errors & debugging

Handle failures gracefully, raise helpful errors, and debug with confidence.

1 match
Errors & debugging easy

How to Catch ValueError in Python (try except)

Handle invalid numeric input by catching ValueError in a try/except block and returning a friendly error message.

errors exception handling valueerror
Python 
def parse_number(text):
    try:
        number = int(text)
        return f"Parsed number: {number}"
    except ValueError as error:
        return f"Error: '{text}' is not a valid number ({error})"


if __name__ == "__main__":
    examples = ["42", "hello", "3.14", "100"]
    for item in examples:
        print(pars…
11 0 Open

Browse by section

Each section groups closely related Python snippets.

Errors & debugging — Python code examples

What you will find here

This page collects errors & debugging 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.

Samples vs tutorials and challenges

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.

Related coding tools

Free online Python IDE Write and run Python in your browser — no install. Free Python code formatter Format with autopep8 — side-by-side PEP 8 cleanup. Python code samples Copy-ready snippets to study and run in the IDE.