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现在，在您决定将我扔出一个不阅读其他问题的窗口之前，我已经搜索了很长时间。事实上，我已经找到了很多答案，但是它们在不同的上下文中，我真的不知道如何将它们与我的代码一起使用，因此我得出的结论是，这将更符合我的兴趣，而不是将时间浪费在其他问题上而不是给我问题的答案，询问我得到的确切错误。

import time
import random
inventory = []
gold = 0
rawfish = ["Mackarel", "Cod", "Salmon", "Herring", "Tuna"]
trash = ["Old Shoe", "Thin Bone", "Rusted Empty Box", "Plank Fragment"]
special = ["Copper Ring"]

print"  _           _       _       _        ______ _     _     _ "            
print" | |         | |     (_)     ( )      |  ____(_)   | |   (_)"            
print" | |     ___ | |_ __  _ _ __ |/ ___   | |__   _ ___| |__  _ _ __   __ _ "
print" | |    / _ \| | '_ \| | '_ \  / __|  |  __| | / __| '_ \| | '_ \ / _` |"
print" | |___| (_) | | |_) | | | | | \__ \  | |    | \__ \ | | | | | | | (_| |"
print" |______\___/|_| .__/|_|_| |_| |___/  |_|    |_|___/_| |_|_|_| |_|\__, |"
print"               | |                                                 __/ |"
print"               |_|                                                |___/ "
time.sleep(2)
print".       .                                     /|    /|     "
print" \     /                o                      |     |     "
print"  \   /   .-. .--..--.  .   .-. .--.       o   |     |     "
print"   \ /   (.-' |   `--.  |  (   )|  |           |     |     "
print"    '     `--''   `--'-' `- `-' '  `-      o   |  o  |     " 
time.sleep(2)
print "In this current version the first item in your inventory is sold."

def sell_function():
    if inventory[0] in rawfish:
        sold = inventory.pop(0)
        gold = gold+5
        print "You have sold a", sold, "for 5 gold coins!"
    elif inventory[0] in trash:
        sold = inventory.pop(0)
        gold = gold+5
        print "You have recycled a", sold, "for 1 gold coins!"
    elif inventory[0] in special:
        sold = inventory.pop(0)
        gold = gold+5
        print "You have sold a", sold, "for 10 gold coins!"
    else:
        print "Shopkeeper:'You can't sell that.'"

def fish_function():
    random_fishingchance = random.randrange(1,32)
    if 1 <= random_fishingchance < 3:
        inventory.append("Mackarel")
        print "You have reeled in a Mackarel!"
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 3 <= random_fishingchance < 5:
        inventory.append("Cod")
        print "You have reeled in a Cod!"
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 5 <= random_fishingchance < 7:
        inventory.append("Salmon")
        print "You have reeled in a Salmon!"
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 7 <= random_fishingchance < 9:
        inventory.append("Herring")
        print "You have reeled in a Herring!"
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 9 <= random_fishingchance < 11:
        inventory.append("Tuna")
        print "You have reeled in a Tuna!"
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 11 <= random_fishingchance < 16:
        inventory.append("Old Shoe")
        print "You have reeled in an Old Shoe..."
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 16 <= random_fishingchance < 21:
        inventory.append("Thin Bone")
        print "You have reeled in a Thin Bone..."
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 21 <= random_fishingchance < 26:
        inventory.append("Rusted Empty Box")
        print "You have reeled in a Rusted Empty Box..."
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 26 <= random_fishingchance < 31:
        inventory.append("Plank Fragment")
        print "You have reeled in a Plank Fragment..."
        time.sleep(0.5)
        print "You place it into your inventory"
    elif 31 <= random_fishingchance < 32:
        inventory.append("Copper Ring")
        print "You have reeled in a ring shaped object covered in mud."
        print "After cleaning it you notice it is a Copper Ring!"
        time.sleep(0.5)
        print "You place it into your inventory"
    else:
        print "It seems your fishing line has snapped!"


def action_function():
    while True:
        action = raw_input("Do you want to 'sell'  'fish'  'inventory' 'money' or 'quit'?")
        if action == "quit":
            break
            end
        if action == "sell":
            sell_function()
        if action == "fish":
            print "You throw your reel..."
            time.sleep(10)
            fish_function()
        if action == "inventory":
            print "You begin to open your inventory"
            time.sleep(0.5)
            print inventory
        if action == "money":
            print gold
        if action == "gold":
            print gold
action_function()

现在，我得到的错误与“ sell_function()”有关。当我运行程序/游戏时，一切正常，直到我输入“sell”并输入。我想要发生的是从库存中删除第一个项目，并根据项目的类型添加一定数量的“ gold”。但是，当我这样做时，它会出现：

Traceback (most recent call last):
  File "C:\Users\Lolpin\Desktop\fishinglooptest.py", line 129, in <module>
    action_function()
  File "C:\Users\Lolpin\Desktop\fishinglooptest.py", line 116, in action_function
    sell_function()
  File "C:\Users\Lolpin\Desktop\fishinglooptest.py", line 43, in sell_function
    gold = gold+5
UnboundLocalError: local variable 'gold' referenced before assignment
4

2 回答 2

1

由于这一行gold = gold+5，python 认为这gold是一个局部变量，当您实际调用该函数时，它不会gold从全局变量中获取值。goldsell_function()

发生这种情况是因为函数中的局部变量是在解析函数定义时决定的。

global如果要修改全局变量，请使用语句：

def sell_function():
    global gold
    if inventory[0] in rawfish:
       sold = inventory.pop(0)
       gold = gold+5
于 2013-07-09T19:05:59.680 回答
1

审查职能范围。由于您要为 gold 分配一个新值，python 会创建一个新变量。然后您尝试将其增加 5，因此它会尝试获取新的“黄金”的值，这会引发错误。

UnboundLocalError: local variable 'gold' referenced before assignment

在所有更改它的函数中将“gold”声明为全局变量。

global gold
if inventory[0] in rawfish:
于 2013-07-09T19:11:40.750 回答