Python 3.6 - 如何用文字翻译电话号码

Question

尝试让这个程序将字母翻译成数字，以便可以输入带有单词的电话号码并输出数字版本。 (1800GOTJUNK = 18004685865) 不确定我哪里出错了，但每个输出只给出最后一个字母是什么，并为所有数字重复它的数字 (1800adgjmptw = 18009999999)。非常感谢任何帮助，谢谢。

def transNum(string):
    number = 1
    for ch in string:
        if ch.lower() in "abc":
            number = 2
        elif ch.lower() in "def":
            number = 3
        elif ch.lower() in "ghi":
            number = 4
        elif ch.lower() in "jkl":
            number = 5
        elif ch.lower() in "mno":
            number = 6
        elif ch.lower() in "pqrs":
            number = 7
        elif ch.lower() in "tuv":
            number = 8
        elif ch.lower() in "wxyz":
            number = 9
    return number


def translate(phone):
    newNum = ""
    for ch in phone:
        if ch in   ["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z"]:
            newNum = newNum + str(transNum(phone))
        else:
            newNum = newNum + ch
    return newNum

def main():
    phone = input("enter a phone number")
    noLetters = translate(phone)
    print("The number you entered: ", phone)
    print("Translates to: ", noLetters)

main()

Answer 1

str(transNum(phone)) 应该是 str(transNum(ch))而且 transNum 不需要迭代其输入，因为它只会保留最后一个数字(它被设计为将一个字母作为输入)。