Błąd w programie python

Question

import os
import random
import time
import datetime 
from subprocess import call

var_0 = 'w'
var_1 = 's'
var_2 = 'a'
var_3 = 'd'
choice_0 = 'y'
choice_1 = 'n'

#player
hp = 100
hunger = 0
energy = 100
thirst = 0

time = datetime.time(7,00)

def screen_clear():
   _ = call('clear' if os.name =='posix' else 'cls')

equipment = ["apple(15)", "water(45)", "sandwich(30)"]

print("COMMAND - SURVIVAL")
print()
print("W - Play")
print("S - Exit")
print()
    
menu_input = input("> ")

def game():
    screen_clear()
    print("===================================================")
    print()
    print("-Player Stats-")
    print()
    print("HP:" + str(hp))
    print("ENERGY:" + str(energy))
    print("HUNGER:" + str(hunger))
    print("THIRST:" + str(thirst))
    print("EQUIPMENT: " + str(equipment))
    print("TIME: " + time)
    print()
    print("W - Go Somewhere")
    print("S - Use Item")
    print("A - Craft Something")
    print("D - Look Around")
    print()
    user_input = input("> ")
    if user_input == var_0:
        print("W - East")
        print("S - West")
        print("A - North")
        print("D - South")
        print("N - I don't want go anywhere.")
        user_input == input("> ")
        if user_input == var_0:
            print("You went east.")
            energy = energy -- 10
            game()
        elif user_input == var_1:
            print("You went west.")
            game()
        elif user_input == var_2:
            print("You went north.")
            game()
        elif user_input == var_3:
            print("You went South.")
            game()
    elif user_input == var_1:
        print("What do you want to use?")
        print("Enter the number of item you want to use.")
        print("EQUIPMENT: " + str(equipment))
        user_input == input("> ")
    elif user_input == var_2:
        print("What do you want to craft?")
    elif user_input == var_3:
        print("What do you want to do?")
        user_input == input("> ")

if menu_input == var_0:
    screen_clear()
    print("Do you know how to play?")
    print("Y/N")
    user_input = input("> ")
    if user_input == choice_0:
        game()
    elif user_input == choice_1:
        screen_clear()
        print("HOW TO PLAY:")
        print()
        print("")
        print("")
        print("")
        print("")
        print("")
        print()
        print("Press enter to return to the menu.")
elif menu_input == var_1:
    print()

 

Nie mam zielonego pojęcia co mogło pójść źle

Błąd:

Traceback (most recent call last):

  File "main.py", line 91, in <module>

    game()

  File "main.py", line 42, in game

    print("ENERGY:" + str(energy))

UnboundLocalError: local variable 'energy' referenced before assignment     

Answer 1

W funkcji game dodaj powyżej użycia zmiennej:

global energy

Co oznacza, że użyjemy zmiennej globalnej, a nie zmiennej lokalnej w funkcji

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