为什么我的变量没有按照定义显示？

Question

我正在尝试将“摇滚，纸，剪刀”作为我的第二个程序。 我一直遇到错误，

"Traceback (most recent call last):
  File "/home/cabox/workspace/main.py", line 118, in <module>
  File "/home/cabox/workspace/main.py", line 48, in Rock_Paper_Scissors
    else:
NameError: name 'rps_choice' is not defined"

这是代码。

import time
import random

def Rock_Paper_Scissors():
  print("Welcome to the \"Rock, Paper, Scissors\" game!")

  time.sleep(2)

  def rps_input():
    while True:
      rps_choice = input("Say \"Rock\", \"Paper\", or \"Scissors\" to get started: ")

      if rps_choice.upper() == "ROCK":
        print("Great! You chose", rps_choice.upper(), end='')
        print("! The computer picked...")
        return rps_choice.upper()
      if rps_choice.upper() == "PAPER":
        print("Great! You chose", rps_choice.upper(), end='')
        print("! The computer picked...")
        return rps_choice.upper()
      if rps_choice.upper() == "SCISSORS":
        print("Great! You chose", rps_choice.upper(), end='')
        print("! The computer picked...")
        return rps_choice.upper()
      
      else:
        print("Sorry, please say \"Rock\", \"Paper\", or \"Scissors.\"")

        time.sleep(2)

        print("\n")

  rps_input()

  time.sleep(2)

  rps_list = ["ROCK","PAPER","SCISSORS"]

  rps_random = random.choice(rps_list)
  print(rps_random, end='')
  print("!")

  time.sleep(2)

  if rps_choice == rps_random:
    print("You both picked the same. Please try again.")
    rps_input()
  else:

    if rps_choice == "ROCK":

      if rps_random == "PAPER":
        print("The computer's paper beats your rock.")

        time.sleep(2)

        print("You LOSE.")
      if rps_random == "SCISSORS":
        print("Your rock beats the computer's scissors!")

        time.sleep(2)

        print("You WIN.")
    if rps_choice == "PAPER":

      if rps_random == "ROCK":
        print("Your paper beats the computer's rock!")

        time.sleep(2)

        print("You WIN.")
      if rps_random == "SCISSORS":
        print("The computer's scissors beats your paper.")

        time.sleep(2)

        print("You LOSE.")
      
    else:
      
      if rps_random == "ROCK":
        print("The computer's rock beats your scissors.")

        time.sleep(2)

        print("You LOSE.")
      if rps_random == "PAPER":
        print("Your scissors beat the computer's paper.")

        time.sleep(2)

        print("You WIN.")

  time.sleep(2)

  def RPS_Reset_Quit():
    rq = input("Restart or quit? (R/Q): ")
    if rq.lower() == "r":
      print("\n")
      Rock_Paper_Scissors()
    if rq.lower() == "q":
      print("Quiting...")

      time.sleep(2)

      quit()
    else:
      print("Sorry, please say either R or Q.")

      time.sleep(2)

      RPS_Reset_Quit()
  RPS_Reset_Quit()

Rock_Paper_Scissors()

正如您可能看到的，我的变量rps_choice未定义，即使它已定义并从rps_input()函数返回。 我真的不知道为什么会这样。

Answer 1

您打算在rps_choice捕获返回值：

rps_choice = rps_input()

另外，我看到您在两条不同的行上调用了rps_input() 。 这两行都需要更新。

Answer 2

因为你在函数rps_input()定义了它，所以它只属于那个函数。 把它想象成一个层次结构，下层作用域的变量可以访问上层作用域的变量，但不能相反。