Question

基本上，我运行的程序只是出现了这个错误'output2.append（chr（BASE +（ord（letter） - BASE + newKey2 [pos]）％26）） IndexError：列表索引超出范围'
这是我的代码：

BASE = ord('A')
choice = input("Would you like to encrypt?")
key = input("Please enter a keyword to encrypt by: ").upper()
key2 = input("Please enter a keyword to encrypt by: ").upper()
#keyword to upper case
key = [ord(letter)- BASE + 1 for letter in key]
key2 = [ord(letter)- BASE + 1 for letter in key2]
count = 0 #This sets the count to 0
file = open("Test.txt","r")
while True:
    MSG = ''.join(chr for chr in file)
    if not chr in file: break 
newKey = (key*len(MSG))[:len(MSG)]

newKey2 = (key2*len(MSG))[:len(MSG)]     
output = []
output2 = []
pos = 0 

for letter in MSG:
    output.append(chr(BASE + (ord(letter)- BASE + newKey[pos]) % 26))
    pos += 1
print(output)

for letter in output:
    output2.append(chr(BASE + (ord(letter)- BASE + newKey2[pos]) % 26))
    pos += 1
print(output2)
print("Your encrypted message is:", ''.join(output2))        
file.close()

Answer 1

您的pos不会自动重置为0，这就是您收到错误的原因。在循环for letter in MSG:之后，您的pos变量为len(MSG)。然后，您尝试在下一个循环中访问该索引，并且仍在递增pos。我的意思是您没有访问newkwy2[0], newkey2[1], newkey2[2], ...，而是newkwy2[len(MSG)], newkey2[len(MSG) + 1], newkey2[len(MSG) + 2], ...

要避免此错误，您可以在循环之间将变量重置为零，或尝试以下操作：

for index, letter in enumerate(output):
    output2.append(chr(BASE + (ord(letter)- BASE + newKey2[index]) % 26))

这样您甚至不需要使用pos变量。

我正在尝试通过从文件中读取所述文本并使用2个关键字加密来重新创建Caesar密码

1 个答案: