它返回的错误是：
NameError: name 'lives' is not defined
我知道代码并不是尽可能高效，这是我的第一个项目，但是无论我尝试做什么，都会弹出这个错误，我尝试为其创建一个全局变量，但这没有帮助。我真的很感激一些帮助，谢谢！
import random
import time
def main():
global guess,rand_num
win = False
rand_num = 45
lives = 10
while lives > 0 and win == False:
guess = int(input("Guess a number!"))
compare()
print("Well done!")
time.sleep(3)
def compare():
global lives,win
if guess == rand_num:
print("You guessed correct!")
win = True
elif guess > rand_num:
print ("Guess lower!")
lives = lives - 1
else:
print ("Guess higher!")
lives = lives - 1
def repeat():
replay = input("would you like to play again? Y/N")
if replay == "Y":
print("enjoy!")
main()
elif replay == "N":
"Goodbye then, hope you enjoyed!"
time.sleep(3)
os._exit
else:
print("please enter Y or N")
repeat()
main()
repeat()
编辑：将全局生命放入 main() 中会返回错误：
UnboundLocalError: local variable 'lives' referenced before assignment
您需要在函数 main 之外定义变量“lives”，然后在任何要引用该全局变量的函数中定义“global lives”。当您在函数中并向变量赋值时，它假定它在局部范围内。使用“全局生命”告诉该函数将全局范围作为生命的参考。
import random
import time
lives = 10
win = False
guess = 0
rand_num = 45
def main():
global guess, rand_num, lives, win
win = False
rand_num = 45
lives = 10
while lives > 0 and win == False:
guess = int(input("Guess a number!"))
compare()
print("Well done!")
time.sleep(3)
def compare():
global guess, rand_num, lives, win
if guess == rand_num:
print("You guessed correct!")
win = True
elif guess > rand_num:
print ("Guess lower!")
lives = lives - 1
else:
print ("Guess higher!")
lives = lives - 1
def repeat():
replay = input("would you like to play again? Y/N")
if replay == "Y":
print("enjoy!")
main()
elif replay == "N":
"Goodbye then, hope you enjoyed!"
time.sleep(3)
os._exit
else:
print("please enter Y or N")
repeat()
main()
repeat()
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