NameError comes when you try to use a name or variable that is not defined in the scope. The Python interpreter clearly states that it does not find the reference for the given variable or name. The Nameerror: name self is not defined is one of them. In this post, you will know how to solve this NameError.
Why is the Nameerror: name self is not defined Comes?
The NameError: name ‘self’ is not defined error occurs when Python sees that the reference to self is inside a class method or inside the class itself. But the self is not defined anywhere in the context.
Cause and Solutions of name self is not defined
To solve this error, you need to ensure that you are using the
self parameter correctly. Here are a few common scenarios that you may get while coding.
Cause 1: You Forget to include
self as the first parameter in a class method definition.
class MyClass: def my_method(): # Missing 'self' as the first parameter # method code
Solution: Always Add
self as the first parameter to the method definition like below.
class MyClass: def my_method(self): # Include 'self' as the first parameter # method code
Cause 2: You are using self outside the class method.
class MyClass: # class code self.some_attribute = 5 # Incorrect usage of 'self' outside of a method
Solution: You should make sure to use self within the context of a class method.
Cause 3: You are calling a class method incorrectly without an instance of the class.
class MyClass: def my_method(self): # method code MyClass.my_method() # Incorrect way to call a class method
Solution: Always create an instance of the class and call the method on the instance.
my_instance = MyClass() my_instance.my_method() # Correct way to call a class method
In most cases, NameError occurs when using any variable or function in a code but the reference is not defined anywhere. This tutorial gives you the causes and solutions for Nameerror: name self is not defined error. If you encounter the error then the above will solve it.