Question

为什么它总是以“恭喜！你赢了一只木兔！”来回归？

似乎x和y值不会改变。

def which_prize(Points):
    y=1
    if 0<= Points >=50 :
        x="wooden rabbit"
    elif 151<= Points >=180 :
        x="wafer-thin mint"
    elif 181<= Points >=200 :
        x="penguin"
    else:
        y=0
    re="Congratulations! You have won a {}!".format(x)
    if y==0 :
        re= "Oh dear, no prize this time."

    return re

#print(which_prize(51))
print(which_prize(151))
print(which_prize(181))
print(which_prize(200))
print(which_prize(18000))

Answer 1

对于大于或等于50的每个if，第一个Point块都为真。

if 0 <= Points >= 50:

一个工作示例：

def which_prize(Points):
    y = 1
    x = ''
    if 0 <= Points <= 50:
        x = "wooden rabbit"
    elif 151 <= Points <= 180:
        x = "wafer-thin mint"
    elif 181 <= Points <= 200:
        x = "penguin"
    else:
        y = 0

    re = "Congratulations! You have won a {}!".format(x)

    if y == 0:
        re = "Oh dear, no prize this time."
    return re


print(which_prize(51))
print(which_prize(151))
print(which_prize(181))
print(which_prize(200))
print(which_prize(18000))

将打印：

Oh dear, no prize this time.  
Congratulations! You have won a wafer-thin mint!  
Congratulations! You have won a penguin!  
Congratulations! You have won a penguin!  
Oh dear, no prize this time.

Answer 2

def which_prize(points):

    prize = None
    if 0 <= points <= 50:
        prize = "a wooden rabbit"
    elif 151 <= points <= 180:
        prize = "a wafer-thin mint"
    elif 181 <= points <= 200:
        prize = "a penguin"

    if prize:
        return "Congratulations! You have won " + prize + "!"
    else:
        return "Oh dear, no prize this time."

print(which_prize(51))
print(which_prize(151))
print(which_prize(181))
print(which_prize(200))
print(which_prize(18000))

Answer 3

这里有更好的解决方案：

points = 199

if points <= 50:
    result = "Congratulations! You won a wooden rabbit!"
elif points <= 150:
    result = "Oh dear, no prize this time."
elif points <= 180:
    result = "Congratulations! You won a wafer-thin mint!"
else:
    result = "Congratulations! You won a penguin!"

print(result)

输出：

Congratulations! You won a penguin!

为什么“if 0＆lt; = Points＆gt; = 50：”总是触发？

3 个答案: