python - 为什么我会收到 NameError？

Question

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Answer 1

您收到错误是因为 guess 仅存在于 func1() 的范围内。您需要从 func1() 返回值 guess 才能使用它。

像这样:

def func1():
    a = True
    while a == True:
        try:
            guess = int(input("guess it: "))
            a = False
        except ValueError:
            print("Not a valid number.")
    return guess # i'm returning the variable guess

import random
number = random.randint(0, 50)
print("Im thinking of a number between 0 and 50,")

guess = func1() # I'm assigning the value of guess to the global variable guess

if guess == number:
    print("Perfect, you got it from the first try!")