Python Error Encyclopedia: Stop Guessing, Start Debugging

Every programmer makes mistakes. The difference between a beginner and a pro is how fast they fix them. The Python Error Guide can help bridge this gap.

This guide is your Emergency Kit. When your code crashes, find your error message below to understand why it happened and exactly how to fix it. With this Python Error Guide, debugging becomes simpler.

🛑 Syntax Errors (The Code Won’t Start)

These happen before your code even runs. You likely made a typo or broke a grammar rule. The Python Error Guide will help identify and correct these errors quickly.

SyntaxError: invalid syntax

The most common error. You forgot a colon :, a parenthesis ), or a quote mark '.

IndentationError: unexpected indent

Python relies on spaces. If you mix tabs and spaces, or indent a line that shouldn’t be indented, this happens.

🔍 Runtime Errors (Crashes Logic)

The code starts running, but crashes when it hits a specific line. Our Python Error Guide will help you troubleshoot effectively.

NameError: name ‘x’ is not defined

You tried to use a variable that doesn’t exist yet, or you misspelled it.

TypeError: object is not subscriptable / callable

You tried to loop over None or call a variable like a function.

IndexError: list assignment index out of range

You tried to grab item #10 from a list that only has 5 items.

KeyError: ‘x’

You tried to look up a key in a Dictionary that doesn’t exist. The Python Error Guide can aid in pinpointing such mistakes.

📦 Import & Setup Errors

Issues with libraries and environments. Use the Python Error Guide to resolve them efficiently.

ModuleNotFoundError: No module named ‘pandas’

You installed a library, but Python can’t find it. This is usually an environment issue.

ImportError: cannot import name…

The file exists, but the specific function you want isn’t there. Often caused by circular imports or bad file naming.

  • [Fix Circular Imports & ImportErrors →] (Coming soon)

🧮 Math & Logic Errors

The code runs, but the math is impossible.

ValueError: math domain error / invalid literal

You tried to calculate the square root of -1, or convert “text” into a number.

  • [Fix ValueErrors & Math Issues →] (Coming soon)

How to Read a Traceback

(This is a great place to add a future section explaining how to read those long error messages Python prints out!)