python - 参加 Python 类(class)并学习二分搜索，对为什么我的语义不正确感到困惑

Question

我们的任务是编写一段代码来猜测 0 到 100 之间的一个 secret 数字。这是我的一段代码:

low = 0
mid = 50
high = 100
secretnum = "Is your secret number " + str(mid) + "?"
print"Please think of a number between 0 and 100!"
print secretnum
herp = raw_input("Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
while herp != 'c':
    if herp == 'h':
        high = mid
        mid = int((mid + low)/2)
    elif herp == 'l':
        low = mid
        mid = int((mid + high)/2)
    else:
        print"Sorry, I did not understand your input."
    print secretnum
    herp = raw_input("Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
if herp == 'c':
    print "Game over. Your secret number was: " + str(mid)

这是输出:

Is your secret number 50?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. h
Is your secret number 50?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. l
Is your secret number 50?
Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. c
Game over. Your secret number was: 37

Answer 1

正如 Raufio 指出的那样，Python 字符串是不可变的。要解决一遍又一遍地重复 50 的问题，您需要在打印出问题时再次调用 str(mid)。例如:

low = 0
mid = 50
high = 100
secretnum = "Is your secret number: " 
print"Please think of a number between 0 and 100!"
print secretnum + str(mid) + "?"
herp = raw_input("Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
while herp != 'c':
    if herp == 'h':
        high = mid
        mid = int((mid + low)/2)
    elif herp == 'l':
        low = mid
        mid = int((mid + high)/2)
    else:
        print"Sorry, I did not understand your input."
    print secretnum + str(mid) + "?"
    herp = raw_input("Enter 'h' to indicate the guess is too high. Enter 'l' to indicate the guess is too low. Enter 'c' to indicate I guessed correctly. ")
if herp == 'c':
    print "Game over. Your secret number was:", mid