Simple Calculator(Prototype)

def home():
    print "Welcome! Please enter the function you desire: "
    function = raw_input()
    if function == '+':
        return add()
    if function == "/":
        return div()
    if function == "*":
        return mul()
    if function == "-":
        return sub()
    else:
        print "Invalid character"
    return home()

def add():
    print "Enter 1st number"
    a = int(raw_input())
    print "Enter 2nd number"
    b = int(raw_input())
    c = a + b
    print "The sum is",c
    return home()

def div():
    print "Enter 1st number"
    a = float(raw_input())
    print "Enter 2nd number"
    b = float(raw_input())
    c = a / b
    print "The quotient is", (c)
    return home()

def mul():
    print "Enter 1st number"
    a = int(raw_input())
    print "Enter 2nd number"
    b = int(raw_input())
    c = a * b
    print "The product is", c
    return home()

def sub():
    print "Enter 1st number"
    a = int(raw_input())
    print "Enter 2nd number"
    b = int(raw_input())
    c = a - b
    print "The difference is", c
    return home()