想不通 Python 3.7 NameError

Question

大家好！因此，我尝试编写一个简单的猜谜游戏，但我不断收到相同的错误“名称 'upperBound' 未定义”，并且无法弄清楚如何修复它。我也会附上错误的截图。

import math

lowerNum = int(input("Enter lower point: "))
upperNum = int(input("Enter upper point: "))

guesses = round(math.log(upperBound))

print("Number of guesses: ", guesses)

response = ""
count = 0

while response != "y" and count < guesses:
    compGuess = round((lowerBound + upperBound)/2)
    print ("Is your number: ", compGuess)
    count += 1
    response = input("either h if too high, l if too low, y if it's correct: ")
    if response == 'h':
        upperBound = compGuess
    elif response == 'l':
        lowerBound = compGuess
    elif response == 'y':
        print ("The computer guessed your answer in", count, "guesses.")
    else:
        print ("Invalid input" , end= '--')
        count -= 1
    compGuess = round((lowerBound + upperBound) /2)
if guesses <= 0:
    print("Computer has used up all the guesses : (")
else:
    pass

error screenshoot

Answer 1

第 3 行定义：

upperNum = int(input("Enter upper point: "))

然而第 6 行使用 upperBound:

guesses = round(math.log(upperBound))

Answer 2

如果您定义 upperBound，您的代码将工作，就像错误消息分析的那样，例如：

upperBound = 100

使用前必须定义。

对其他未定义的变量做同样的事情，比如lowerBound.

难道你想在这里定义它们:

lowerNum = int(input("Enter lower point: "))
upperNum = int(input("Enter upper point: "))

你错过了变量名？我想你的意思是：

lowerBound = int(input("Enter lower point: "))
upperBound = int(input("Enter upper point: "))

想不通 Python 3.7 NameError

Can't figure out Python 3.7 NameError

python

nameerror