NameError when running script

Question

While running this script I am receiving the following error.

  p1=Person1("Plumber",fav_food,ethnicity,name,"male") 
NameError: name 'fav_food' is not defined

I am new to OOP but, the way I understand it, fav_food is define when I defined the Person1 class. Obviously I am wrong, but why?

class Person():
    def __init__(self,job,fav_food,ethnicity,name,gender):
        self.job=job
        self.fav_food=fav_food
        self.ethnicity=ethnicity
        self.name=name
        self.gender=gender

class Person1(Person):
    def __init__(self,job,fav_food,ethnicity,name,gender):
        Person.__init__(self,job,fav_food,ethnicity,name,gender)
        self.job=job
        self.fav_food="chips"
        self.ethnicity="white"
        self.name=random.shuffle(names)[0]
        self.gender=gender

p1=Person1("Plumber",fav_food,ethnicity,name,"male")

Answer 1

remove all unnecessary arguments from Person1.__init__ :

class Person():
    def __init__(self, job,fav_food,ethnicity,name,gender):
        self.job=job
        self.fav_food=fav_food
        self.ethnicity=ethnicity
        self.name=name
        self.gender=gender

class Person1(Person):
    def __init__(self,job,gender):
        Person.__init__(self,job,"chips","white",random.shuffle(names)[0],gender)

p1=Person1("Plumber", "male")

Answer 2

fav_food is defined locally in __init__ and in future instance namespaces due to its sole assignment in __init__ . It is not defined in the module namespace in which you attempt to create a Person1 instance using fav_food , hence the error.

Python uses the LEGB rule for variable name resolution. It searches from L to B, starting at the level in which the name occurs. The name resolves to the first name definition found. A NameError occurs if no name definition is found.

L - Local : first it looks for variable definitions in the local scope of functions

E - Enclosing : next it looks in the scope of any enclosing functions

G - Global : then it looks for the variable definition at the module level. In the code fav_food is referenced in the module scope, so Python requires a definition of fav_food at the module level or higher

B - Built-in : finally Python looks for built-in variable definitions

In addition to LEGB name resolution, there is also object.attribute resolution. In this case fav_food will be defined in person instances: person.fav_food