Question

我已经创建了一个生成安全密码短语的python程序，我已做过这样，以便用户可以决定是否将其密码打印到具有raw_input功能的文本文件中。我还做了这样，如果用户决定输入程序无法识别的输入，程序就会重复。我虽然对这个问题感到难过。下面是代码，下面是我对问题的解释。

if writeyn == 'Y' or writeyn == 'y' or writeyn == 'yes' or writeyn == 'Yes':
    print('Written to passwords.txt')
    f = open("passwords.txt", "a+") # "append"
    f.write(passtype + " - " + mypw)

if writeyn == 'n' or writeyn == 'N' or writeyn == 'no' or writeyn == 'No':
    print('Writting Stopped.')

while writeyn != 'n' or writeyn != 'N' or writeyn != 'no' or writeyn != 'No' or writeyn != 'Y' or writeyn != 'y' or writeyn != 'yes' or writeyn != 'Yes':
     writeyn = raw_input("Invalid Input; " + "\nWould you like to write your password to a text file? Y or n")
     writeyn = writeyn.strip()
     if writeyn == 'n' or writeyn == 'N' or writeyn == 'no' or writeyn == 'No':
         print 'Writing Stopped.'
         break
     elif writeyn == 'Y' or writeyn == 'y' or writeyn == 'yes' or writeyn == 'Yes':
         print('Written to passwords.txt')
         f = open("passwords.txt", "a+")
         f.write(passtype + " - " + mypw)
         break

当我在终端I中运行程序时，得到以下输出，如下面的链接所示。

print statement repeats twice

当用户指定他们不想将密码写入passwords.txt文件时，而不是print 'Writing Stopped.打印一次，而是重复两次。这也适用于print('Written to passwords.txt')。我看过空白，看看是不是问题，但似乎不是。有谁知道导致程序执行此操作的原因是什么？

Answer 1

问题在于如何连接

中的逻辑比较

while writeyn != 'n' or writeyn != 'N' or writeyn != 'no' or writeyn != 'No' or writeyn != 'Y' or writeyn != 'y' or writeyn != 'yes' or writeyn != 'Yes':

根据您输入的截图＆＃34; n＆＃34;。所以比较

writeyn != 'n'

是假的，但是

writeyn != 'N'

是真的。由于您使用OR将它们全部连接起来，因此最终结果为true并且您输入while循环（导致对话框重新出现）。

为了解决这个问题，我建议使用

while not (writeyn == 'n' or writeyn == 'N' or writeyn == 'no' or writeyn == 'No' or writeyn == 'Y' or writeyn == 'y' or writeyn == 'yes' or writeyn == 'Yes'):

在Python

1 个答案: