How to Fix: UnboundLocalError: local variable referenced before assignment
This is one of Python’s trickiest errors, known as UnboundLocalError. It happens because of how Python handles Variable Scope (where variables can be seen). The…
How to Fix: TypeError: list indices must be integers or slices, not str
If you’ve ever encountered “TypeError: list indices”, this error almost always means one thing: You think you have a Dictionary, but you actually have a…
How to Fix: FileNotFoundError: [Errno 2] No such file or directory
You tried to open a file in Python, but it crashed with this error, resulting in a FileNotFoundError Python message. However, understanding the common causes can help…
How to Fix: ValueError: invalid literal for int() with base 10
Encountering a ValueError: invalid literal for int() can be a bit confusing at first. This error is a mouthful, but it’s actually very simple. It…
Python Try-Except Blocks: Handling Errors Gracefully
You’ve seen plenty of errors by now: ValueError, TypeError, ZeroDivisionError. In Python, Try Except can be used to handle these errors gracefully. Normally, when these…
How to Fix: AttributeError: ‘NoneType’ object has no attribute ‘x’
If you’ve encountered the AttributeError: ‘NoneType’ object, this error message looks confusing, but it’s actually very specific. It translates to: “You are trying to use…
How to Fix: SyntaxError: invalid syntax in Python
A SyntaxError, such as a SyntaxError: invalid syntax, means Python couldn’t even read your code, let alone run it. When you encounter This Error, it’s…
How to Fix: KeyError in Python (Dictionaries and Pandas)
A KeyError is Python telling you: “You asked me to look for a key that doesn’t exist.” Understanding what a KeyError is and how to…
How to Fix: NameError: name ‘x’ is not defined in Python
Seeing NameError: name is not defined? This is Python’s most common typo error. Learn the 3 main causes and how to fix them instantly.
How to Fix: IndentationError: unexpected indent in Python
Welcome to the most “Pythonic” error you will ever see. If you’ve come from another language like JavaScript or Java, this error might seem strange,…
