python - 如果python中的语句不打印

Question

我正在为学校做作业，这个程序 super 简单，但我的 if 语句不能正常工作。有人知道为什么吗？这是代码:

letter = input("Name one of the most common letters in wheel of fortune puzzles: ")

if letter == "r":
    print(letter, "is one of the most common letters!")
if letter == "s":
    print(letter, "is one of the most common letters!")
if letter == "t":
    print(letter, "is one of the most common letters!")
if letter == "l":
    print(letter, "is one of the most common letters!")
if letter == "n":
    print(letter, "is one of the most common letters!")
if letter == "e":
    print(letter, "is one of the most common letters!")

else:
    print("Incorrect!")
    letter = input("Name one of the most common letters in wheel of fortune puzzles: ")


input("\n\nPress the enter key to exit:")

输出是:

Name one of the most common letters in wheel of fortune puzzles: j
Incorrect!
Name one of the most common letters in wheel of fortune puzzles: r


Press the enter key to exit:

Answer 1

我会这样写:

# Assumes Python 3
# Python 2: Use `raw_input` instead of input

common_letters = 'rstlne'
prompt = "Name one of the most common letters in wheel of fortune puzzles: "

while True:
    letter = input(prompt).strip()
    if letter in common_letters:
        print(letter, "is one of the most common letters!")
        break
    else:
        print("Incorrect!")
        answer = input('Type "end" to exit: ')
        if answer.strip() == 'end':
            break

我改变了一些东西:

1. 我使用了 if letter in common_letters: 而不是那么多 if 语句。这使您可以向 common_letters 添加或删除另一个字母。

2. 我使用 input(prompt).strip() 去除多余的空白。

3. 如果没有输入常用字母，我会使用 while True 循环一遍又一遍地重复问题。 break 终止这个循环，即程序结束。