為什么我的ca撒輪班不能正常工作？

Question

這是代碼：

text = input("What's your text:  ")
shift = int(input("What's your shift: "))

def caesar_shift(text, shift):
    cipher = ""
    for i in text:
        if i.isalpha():
            stayIn = ord(i) + shift
            if stayIn > ord('z'):
                stayIn -= 26
            lastLetter = chr(stayIn)
        cipher += lastLetter

        print("Your ciphertext is: ", cipher)

    return cipher

caesar_shift(text, shift)

當我運行它時，例如，測試是“ hello world”，而移位是1，我得到：

What's your text:  hello world
What's your shift: 1
Your ciphertext is:  i
Your ciphertext is:  if
Your ciphertext is:  ifm
Your ciphertext is:  ifmm
Your ciphertext is:  ifmmp
Your ciphertext is:  ifmmpp
Your ciphertext is:  ifmmppx
Your ciphertext is:  ifmmppxp
Your ciphertext is:  ifmmppxps
Your ciphertext is:  ifmmppxpsm
Your ciphertext is:  ifmmppxpsme

為什么是這樣？ 我做錯什么了嗎，謝謝！

Answer 1

你做

if i.isalpha():

但如果沒有，您別無他法。 這意味着您在最后一個字母不是字母時也要添加它。 因此，用ifmmpp代替ifmmp hello 。

該位應更改為：

if i.isalpha():
    stayIn = ord(i) + shift
    if stayIn > ord('z'):
        stayIn -= 26
    lastLetter = chr(stayIn)
    cipher += lastLetter
else:
    cipher += i

如果您不希望每個循環將結果打印一次，請將其移出循環。

Answer 2

要解決打印問題，您可以：

def caesar_shift(text, shift):
    cipher = ""
    for i in text:
        ...

        print("Your ciphertext is: ", cipher)

    return cipher

caesar_shift(text, shift)

但是你應該有

def caesar_shift(text, shift):
    cipher = ""
    for i in text:
        ...

    print("Your ciphertext is: ", cipher)

    return cipher

caesar_shift(text, shift)

還是更好

def caesar_shift(text, shift):
    cipher = ""
    for i in text:
        ...

    return cipher

print("Your ciphertext is: ", caesar_shift(text, shift))