What will be the output of the following code? class A: X = 0 def __init__(self,v = 0): self.Y = v A.X += v a = A() b = A(1) c = A(2) print(c.X)

class A:
    X = 0
    def __init__(self,v = 0):
        self.Y = v
        A.X += v
 
 
a = A()
b = A(1)
c = A(2)
print(c.X)

• 1
• 2
• 0
• 3

Explanation: Let’s analyze the code:

• The first line of the class A definition sets the variable named X to 0. Because X is a class variable, it exists in just one copy and is stored outside any object.
• The class constructor sets the instance variable Y with the v parameter’s value, which defaults to 0.
• The class constructor sets another instance variable equal to the value of the class variable X incremented by the value assigned to v.
• When the a object is created, the X class variable stores 0.
• When the b object is created, the X class variable is incremented with the argument sent, so now X=1.
• When the c object is created, the X class variable is incremented with the argument sent, so now X=3.
• When invoking the print function, 3 is printed in the console.

More Questions: Python Essentials 2 – Module 3 Test