How do you set a default value for an argument in python 3.6?

[SubhanUllah]

While defining the function or class, in the parentheses (), write the parameter followed by a =, followed by the default value…

class Circle(): 
        pi = 3.14 
         
        def __init__(self, radius=2): 
                self.radius = radius 
         
        def area(self): 
                return self.pi * (self.radius)**2 
 
 
c = Circle() 
 
print(c.area()) 
#OUTPUT 
12.56