If-branch for x ==" N"或“否”总是运行 [英] If-branch for x == "N" or "No" always runs

问题描述

可能重复：

为什么`letter ==A或a`总是评估为True？

当我在程序中运行此问题时，问题仍然存在，但无论答案如何，No选项始终运行。如果我切换选项顺序，Y选项将仅运行，它将始终直接启动。我确定我错过了一些简单的东西，我只是不知道是什么。

When I run this in my program, the question goes through, however no matter the answer, the "No" option always runs. If I switch the option order, the "Y" option will only run and it will always go straight to start. I'm sure I'm missing something simple, I just don't know what.

infoconf = raw_input("Is this information correct? Y/N: ")

    if infoconf == "N" or "No":
        print "Please try again."
    elif infoconf == "Y" or "Yes":
        start()
    else:
        print "That is not a yes or no answer, please try again."

推荐答案

假设是

infoconf = raw_input("Is this information correct? Y/N: ")

#you wrote:  infoconf == "N" or "No" but should be:
if infoconf == "N" or infoconf == "No": 
  print "Please try again."
#you wrote: infoconf == "Y" or "Yes" but should be
elif infoconf == "Y" or infoconf == "Yes": 
  start()
else:
  print "That is not a yes or no answer, please try again."

简短说明：

when value of x = 'N'
x == 'N' or 'No' will return True
when value of x = 'Y'
x == 'N' or 'No' will return 'No' i believe this is not what you want

在另一方一边

when value of x = 'N'
x == 'N' or x == 'No' will return True
when value of x = 'Y'
x == 'N' or x == 'No' will return False i believe this is what you want

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