switch case implementation in python

Switch Case:

def switch(operator,x,y):
    if operator=='add':
        z=x+y
        print("the addition of",x,"and",y,"is: ",z)
    elif operator=='sub':
        z=x-y
        print("the subtraction of",x,"and",y,"is: ",z)
    elif operator=='mul':
        z=x*y
        print("the multiplication of",x,"and",y,"is: ",z)
    elif operator=='div':
        z=x/y
        print("the division of",x,"and",y,"is: ",z)
    else:
        print("operation failed")
switch('add',4,5)
switch('sub',4,5)
switch('mul',4,5)
switch('div',4,5)
switch('mod',4,5)

Output:

        
the addition of 4 and 5 is:  9
the subtraction of 4 and 5 is:  -1
the multiplication of 4 and 5 is:  20
the division of 4 and 5 is:  0.8

operation failed