Calculator

def menu():
print "---------------------------------------------------"
print " Welcome To Nevets04's Calculator"
print "---------------------------------------------------"
print "1) Addition"
print "2) Subtraction"
print "3) Multiplication"
print "4) Division"
print "5) Quit"
return input ("Choose an operation: ")
def add(a,b):
print a, "+", b, "=", a + b
def sub(a,b):
print a, "-", b, "=", a - b
def mul(a,b):
print a, "x", b, "=", a * b
def div(a,b):
print a, "/", b, "=", a / b
loop = 1
choice = 0
while loop == 1:
choice = menu()
if choice == 1:
add(input("Add this: "), input("To this: "))
elif choice == 2:
sub(input("Subtract this: "), input("From this: "))
elif choice == 3:
mul(input("Multiply this: "), input("With this: "))
elif choice == 4:
div(input("Divide this: "), input("By this: "))
elif choice == 5:
loop = 0