Question

我是python的新手。以下是Y Daniel Liang Python第4章的练习编程练习。如果彩票号码是333，我会得到133,233,433,533,633,733,833,933等不同用户输入的完美匹配，我不知道为什么。

#!/usr/bin/env python3

#import random

lottery = 333  #random.randint(100, 999)
guess = int(input("\nEnter a three-digit number: "))
print("\nThe Lottery Number is:", lottery)

lottery_digit1 = lottery // 100
lottery %= 100
lottery_digit2 = lottery // 10
lottery_digit3 = lottery % 10

guess_digit1 = guess // 100
guess %= 100
guess_digit2 = guess // 10
guess_digit3 = guess % 10

if guess == lottery:
    print("Perfect Match: First Prize $10,000")
elif (guess_digit1 == lottery_digit1 or
      guess_digit1 == lottery_digit2 or
      guess_digit1 == lottery_digit3) and \
    (guess_digit2 == lottery_digit1 or
     guess_digit2 == lottery_digit2 or
     guess_digit2 == lottery_digit3) and \
    (guess_digit3 == lottery_digit1 or
     guess_digit3 == lottery_digit2 or
     guess_digit3 == lottery_digit3):
    print("Matching All Digits: Second Prize $3,000")
elif (guess_digit1 == lottery_digit1 or
      guess_digit1 == lottery_digit2 or
      guess_digit1 == lottery_digit3) or \
    (guess_digit2 == lottery_digit1 or
     guess_digit2 == lottery_digit2 or
     guess_digit2 == lottery_digit3) or \
    (guess_digit3 == lottery_digit1 or
     guess_digit3 == lottery_digit2 or
     guess_digit3 == lottery_digit3):
    print("Matching a Single Digit: Third Prize $1,000")
else:
    print("Nice Try.")

Answer 1

当最后两位数字相同时，你得到一个匹配的原因是因为这些行在这里：

lottery %= 100
...
guess %= 100

你正在改变彩票和猜测的价值。 +=，-=，*=，/=和%=运算符会更改它们所使用的变量的值。因此，在执行此操作后，您的变量将变为：

lottery =333
lottery %= 100
#lottery is now 33

和

guess = 733
guess %= 100
#guess is now 33

来自Y Daniel Liang的蟒蛇彩票节目

1 个答案: