Instance vs Class Variables

Demonstrate the difference between instance variables and class variables.

PythonBeginner

Python

# Program to demonstrate instance vs class variables

class Counter:
    count = 0  # class variable

    def __init__(self):
        Counter.count += 1
        self.id = Counter.count  # instance variable


c1 = Counter()
c2 = Counter()

print("c1.id:", c1.id)
print("c2.id:", c2.id)
print("Total objects created:", Counter.count)

Output

c1.id: 1
c2.id: 2
Total objects created: 2

The class variable 'count' is shared across all instances, while 'id' is unique per instance.

Create Class & Object

Constructors in Python Classes