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…
How to Fix: TypeError: unsupported operand type(s) for +: ‘int’ and ‘str’
This error is the opposite of the common string concatenation error. It means you tried to do math (+), but one of your items was…
How to Fix: AttributeError: ‘str’ object has no attribute ‘x’
This is the twin error to AttributeError: 'list' object has no attribute ‘x’. The AttributeError str object means you are trying to use a method…
How to Fix: RecursionError: maximum recursion depth exceeded
This error means a function is calling itself over and over again, in an infinite loop, until it hits a safety limit set by Python…
How to Fix: ValueError: not enough values to unpack (expected X, got Y)
This error happens when you use tuple unpacking (assigning multiple variables at once) but the number of variables on the left doesn’t match the number…
How to Fix: TypeError: ‘NoneType’ object is not subscriptable
This error is a close cousin to AttributeError: 'NoneType', In Python, the error message NoneType object is not subscriptable usually appears if you try to…
Mutable vs. Immutable Objects in Python: Why It Matters
In Python, everything is an object. One of the most common concepts you’ll encounter is Mutable vs Immutable Python. But some objects can change (Mutable),…
How to Fix: IndexError: list assignment index out of range
This is a classic misunderstanding of how Python lists work compared to arrays in other languages. One common error is the IndexError list assignment issue,…
How to Fix: AttributeError: ‘list’ object has no attribute ‘x’
This AttributeError: ‘list’ object has no attribute ‘x’ means you are trying to use a specialized method (like a Pandas or Numpy feature) on a…
How to Fix: TypeError: ‘int’ object is not iterable
“Iterable” means “capable of being returned one at a time”. Lists, strings, and ranges are iterable. A single number (integer) is not, which is why…
