How to Fix: AttributeError: ‘NoneType’ object has no attribute ‘x’
This is, without a doubt, the most common error in Python, and it’s frequently seen as an AttributeError NoneType issue. It means: You are trying…
How to Fix: AttributeError: ‘NoneType’ object has no attribute ‘append’
This AttributeError NoneType append is a classic combination of two common problems: a NoneType error and a List method error. It means: You are trying…
How to Fix: TypeError: ‘float’ object is not callable
This error is a direct cousin to TypeError: ‘int’ object is not callable. The TypeError float not callable message means: “You are trying to use…
How to Fix: TypeError: ‘list’ object is not callable
This TypeError list not callable means: “You are trying to use a list as if it were a function.” A “callable” is anything you can…
How to Fix: SyntaxError: positional argument follows keyword argument
This SyntaxError positional argument is a simple but strict rule about how you call functions in Python. The Rule: You can pass arguments in two…
The Python “Mutable Default Argument” Trap (Why Your List is Not Empty)
This is the most famous “gotcha” in all of Python: the Mutable Default Argument bug. It’s a bug that confuses every developer exactly once. Look…
How to Fix: TypeError: ‘int’ object is not callable
This error is very similar to 'str' object is not callable. One common error in Python is the TypeError int not callable, which means: “You…
How to Fix: TypeError: ‘NoneType’ object is not iterable
This error is simple: you tried to use a for loop on a variable, but that variable was None. In Python, this will raise a…
How to Fix: TypeError: ‘NoneType’ object is not callable
The NoneType object is not callable error means you are trying to “call” a variable (by putting () after it) as if it were a…
Unpacking with * and **: How to Call Functions with Lists and Dictionaries
You’ve learned how to define a function that accepts *args and **kwargs. Now, we’ll learn the opposite: how to call a function using * and…
