CODEWITHSUNDEEP
pythonpython-3.x
Drae Ockenden
Drae Ockenden

Reputation: 3

Changing class variables inside of __init__

I am trying to update the number of people in the code below by adding one every time an instance of the class is performed, it used to work for me but I tried the code today and it isn't working. Also when i try and print the "User.people" variable it returns what I assume is its address in the memory. Please help me.

class User:

    people = int(0)

    def __init__(self, first_name, last_name, age):
        self.name = first_name + " " + last_name
        self.age = age
        User.people += 1

    def __str__(self):
        return f"{self.name} is {self.age} years old"

    def __del__(self):
        User.people -= 1

    def people(self):
        print(f"There are now {self.people} in the class and his name is {self.name}")
        return self.people

person1 = User("Greg", "Mitchel", 76)
person2 = User("Michael", "Hutton", 16)
print(User.people)
print(person1)

Output:

Traceback (most recent call last):
  File "C:/Users/User/Downloads/test.py", line 20, in <module>
    person1 = User("Greg", "Mitchel", 76)
  File "C:/Users/User/Downloads/test.py", line 8, in __init__
    User.people += 1
TypeError: unsupported operand type(s) for +=: 'function' and 'int'

Upvotes: 0

Views: 38

Answers (1)

Prune
Prune

Reputation: 77837

Your error is that you gave the same name to two different class attributes: first, the simple variable; later you redefined people as an instance method. By the time you try to alter the population count, people is redefined as a method, so the increment is illegal. Simply change one name:

def report_pop(self):
    print(f"There are now {self.people} in the class and his name is {self.name}")
    return self.people

Upvotes: 2

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