NameError: name ‘X’ is not defined

How to Fix NameError: name 'X' is not defined

Introduction:

The “NameError: name ‘X’ is not defined” occurs in Python when the interpreter encounters a variable or function name that hasn’t been declared or is out of scope. This error typically results from typos, using a variable before it’s defined, or accessing a variable in the wrong scope. Identifying the cause is essential for debugging and ensuring proper variable definitions.

Common Causes of NameError in Python

The Problem:

A NameError occurs when you try to use a variable or function that hasn’t been defined yet or is out of scope:

print(age) # NameError: name ‘age’ is not defined

The Solution:

Ensure that the variable or function is defined before you use it:

age = 25
print(age) # Output: 25

If you’re dealing with scoping issues inside functions, ensure variables are passed correctly as parameters.