Digit

def zero ():
    return "zero"
def one ():
    return "one"
def two ():
    return "two"
def three ():
    return "three"
def four ():
    return "four"
def five ():
    return "five"
def six ():
    return "six"
def seven ():
    return "seven"
def eight ():
    return "eight"
def nine ():
    return "nine"
def default ():
    return("not a digit")

switcher = {
    1: one,
    2: two,
    3: three,
    4: four,
    5: five,
    6: six,
    7: seven,
    8: eight,
    9: nine
    }

def switch(digit):
    return switcher.get(digit, default)()
print(switch(-0.1))
print(switch(1))
print(switch(9))
print(switch(-9))
print(switch("kek"))