NameError: name 'greet' is not defined

Calling a Function or Module Before It's Defined

Problematic Code:

 

greet()

def greet():
    print("Hello, World!")

Error Message:

 

NameError: name 'greet' is not defined

 

Solution: You must define the function or module before calling it.

 

def greet():
    print("Hello, World!")

greet()