Question

岩石剪刀，当我运行它时程序说决定在分配之前被引用，尽管用户选择和计算机选择显示正常，我已经坚持了很长一段时间并且不熟悉编程。

import random

def main():
   userinput = int(input("First just enter 0 for rock, 1 for paper, or 2 for scissors! "))
   computernumber = random.randint(0,2)
   while userinput != 0 and userinput != 1 and userinput != 2:
      userinput = int(input("Enter 0 for rock, 1 for paper, or 2 for scissors! "))
   print ("You chose ",userchoice(userinput),)
   print ("Computer chose ",computerchoice(computernumber),)  
   print (decision(userchoice,computerchoice))

def userchoice(userinput):
   if userinput == 0:
      userchoice = "rock";
   elif userinput == 1:
      userchoice = "paper";
   elif userinput == 2:
      userchoice = "scissors";
   return userchoice

def computerchoice(computernumber):

   if computernumber == 0:
      computerchoice = "rock";
   elif computernumber == 1:
      computerchoice = "paper";
   elif computernumber == 2:
      computerchoice = "scissors";
   return computerchoice   

def decision(userchoice,computerchoice):

   if (userchoice == computerchoice):
      decision = "It's a draw!";
   elif (userchoice == "rock"):
      if(computerchoice == "paper"):
         decision = "Computer wins!";
   elif (userchoice == "paper"):
      if(computerchoice == "rock"):
         decision = "You win!";
      else:
         decision = "Computer wins!";   
   elif (userchoice == "scissors"):
      if(computerchoice == "rock"):
         decision = "Computer wins!";
      else:
         decision = "You win!";
   return decision


main()

输出：

first just enter 0 for rock, 1 for paper, or 2 for scissors! 1
You chose  paper
Computer chose  rock
Traceback (most recent call last):
  File "MorerockpaperscissorsEM.py", line 60, in <module>
    main()
  File "MorerockpaperscissorsEM.py", line 17, in main
    print(decision(userchoice,computerchoice))
  File "MorerockpaperscissorsEM.py", line 57, in decision
    return decision
UnboundLocalError: local variable 'decision' referenced before assignment

Answer 1

在此行中调用“决定”功能时

print (decision(userchoice,computerchoice))

您将函数'userchoice'和'computerchoice'作为参数传递。调用此函数的正确方法是：

print (decision(userchoice(userinput),computerchoice(computernumber)))

带有显示输出的unboundlocalerror

1 个答案: