猜数字从1到8

Question

我的程序只需问3个问题就能猜出用户的号码(从1到8)。它正确地打印了前两个问题，但是当我为第三个问题按enter键时，它只打印了最后一个输入。如何使所有输入(是或否)小写？

# Simple Expert System
#firstQuestion = prstr(firstQuestion.lower()) 

print("Think of a number between 1 and 8.")

firstQuestion = (raw_input("Is it an even number? "))
secondQuestion = "Is it less than or equal to 4? "
thirdQuestion = "Is it less than or equal to 3? "
fourthQuestion = "Is it less than 3? "
fifthQuestion = "Is it greater than 6? "
sixthQuestion = "Is it greater than 5? "
seventhQuestion = "Is it less than 2? "




if firstQuestion == "yes":
    print(raw_input(secondQuestion))
elif firstQuestion == "no":
    print(raw_input(thirdQuestion))
elif secondQuestion == "yes":
    print(raw_input(fourthQuestion))
elif secondQuestion == "no":
    print(raw_input(fifthQuestion))
elif thirdQuestion == "no":
    print(raw_input(sixthQuestion))
elif thirdQuestion == "yes":
    print(raw_input(seventhQuestion))

elif fourthQuestion == "yes":
    print("Your number is 2")
elif fourthQuestion == "no":
    print("Your number is 4")

elif fifthQuestion == "yes":
    print("Your number is 8")
elif fifthQuestion == "no":
    print("Your number is 6")   

elif sixthQuestion == "yes":
    print("Your number is 7")
elif sixthQuestion == "no":
    print("Your number is 5")       

elif seventhQuestion == "yes":
    print("Your number is 1")
elif seventhQuestion == "no":
    print("Your number is 3")   

Answer 1

首先，你要求第一个问题的投入。这会将答案放入firstQuestion变量中。然后你进入中频区。在这里，您向raw_input请求另一个问题，然后告诉程序打印该值。在这一点上，一个埃利夫的已经成功，而其他的被跳过。

为了达到预期的结果，您应该为应该问的每个新问题创建一个独立的if-组，或者创建一个while-循环。

例如：

# Simple Expert System
#firstQuestion = prstr(firstQuestion.lower()) 

print("Think of a number between 1 and 8.")

firstQuestion = (raw_input("Is it an even number? "))
secondQuestion = "Is it less than or equal to 4? "
thirdQuestion = "Is it less than or equal to 3? "
fourthQuestion = "Is it less than 3? "
fifthQuestion = "Is it greater than 6? "
sixthQuestion = "Is it greater than 5? "
seventhQuestion = "Is it less than 2? "




if firstQuestion == "yes":
    secondQuestion = raw_input(secondQuestion)
elif firstQuestion == "no":
    thirdQuestion = raw_input(thirdQuestion)

if secondQuestion == "yes":
    fourthQuestion = raw_input(fourthQuestion)
elif secondQuestion == "no":
    fifthQuestion = raw_input(fifthQuestion)

if thirdQuestion == "no":
    sixthQuestion = raw_input(sixthQuestion)
elif thirdQuestion == "yes":
    seventhQuestion = raw_input(seventhQuestion)

if fourthQuestion == "yes":
    print("Your number is 2")
elif fourthQuestion == "no":
    print("Your number is 4")

if fifthQuestion == "yes":
    print("Your number is 8")
elif fifthQuestion == "no":
    print("Your number is 6")   

if sixthQuestion == "yes":
    print("Your number is 7")
elif sixthQuestion == "no":
    print("Your number is 5")       

if seventhQuestion == "yes":
    print("Your number is 1")
elif seventhQuestion == "no":
    print("Your number is 3")   

Answer 2

考虑一下，对于较大的数字，您的程序没有很好的扩展性:如果您必须猜测一个介于1到1000之间的数字，那么您将不得不编写大量的代码。

相反，考虑循环遍历可能得到的所有范围：

lower_limit = 1
upper_limit = 100

while lower_limit < upper_limit:
    middle = int(0.5 * (lower_limit + upper_limit))
    check = raw_input("Larger than " + str(middle) + "? ")
    if check.lower().startswith("y"): # Accept anything that starts with a Y as "yes"
        lower_limit = middle + 1
    else:
        upper_limit = middle

print(lower_limit)

Answer 3

实际上，你的程序不能超越第二个问题，

if firstQuestion == "yes":
    print(raw_input(secondQuestion))
elif firstQuestion == "no":
    print(raw_input(thirdQuestion))

无论我是否回答第一个问题，代码将在这两种情况之一，因此不能进入您的程序的其余部分。

您必须编写您的程序，考虑所有可能的场景，以及如何达到它们：

if firstQuestion == "yes":
    #The user answered "yes" to the first question
    if secondQuestion == "yes":
        #The user answered "yes" to the first question and "yes" to the second
    elif secondQuestion == "no":
        #The user answered "yes" to the first question and "no" to the second
elif firstQuestion == "no":
    #The user answered "no" to the first question
    #etc...

通过将此图表继续到所有级别，您将了解游戏的所有场景。