1st function difining calculator

#defining calculator
a=int(input("enter 1st num"))
b=int(input("enter 2nd num"))
def addi(a,b):
    summ=a+b
    return(summ)
def sub(a,b):
    minu=a-b
    return(minu)
def mul(a,b):
    prod=a*b
    return(prod)
def divid(a,b):
    div=a/b
    return(div)

t=input("addi(add),sub(subtract),mul(multiply),divid(division):")
if t=='addi':
    print(addi(a,b))
elif t=='sub':
    print(sub(a,b))
elif t=='divid':
    print(divid(a,b))
else:
    print(mul(a,b))