Python:无法从另一个对象中实例化我的对象:'global name not defined'

时间:2016-09-07 09:25:59

标签: python nameerror

大家好,并提前感谢您的帮助。

我正在学习Python并在Zork风格的冒险游戏中练习。

一旦我定义了类,我的第一个实际指令就是

ourGame = Game('githyargi.txt')

其中githyargi.txt是一个包含所有游戏字符串的文件。方法Game.parseText()按文档记录。

Traceback显示问题:

Traceback (most recent call last):
  File "githyargi.py", line 237, in <module>
    ourGame = Game('githyargi.txt')
  File "githyargi.py", line 12, in __init__
    self.scenes[0] = Start()
  File "githyargi.py", line 166, in __init__
    for string in ourGame.strings['FIRST']:
NameError: global name 'ourGame' is not defined

如果我从执行块执行ourGame.scenes[0] = Start()它很有效 - 没有名称错误,并且self.scenes[0].flavStr充满了适当的风味文本。但是我想创建一个方法Game.makeScenes(),它将创建游戏中的所有场景并将它们存储在列表ourGame.scenes中。为什么Start()的 init 在从Game()的 init 实例化时看到ourGame.strings,当它从执行中实例化时可以看到相同的dict方框?

class Game(object):

    def __init__(self, filename):
        '''creates a new map, calls parseText, initialises the game status dict.'''
        self.strings = self.parseText(filename)
        self.sceneIndex = 0
        self.scenes = []
        self.scenes[0] = Start()
        self.status = {
            "Health": 100,
            "Power": 10,
            "Weapon": "Unarmed",
            "Gizmo": "None",
            "Turn": 0,
            "Alert": 0,
            "Destruct": -1
            }

    def parseText(self, filename):
        '''Parses the text file and extracts strings into a dict of
        category:[list of strings.]'''
        textFile = open(filename)
        #turn the file into a flat list of strings and reverse it
        stringList = []; catList = [] ; textParsed = {}
        for string in textFile.readlines():
            stringList.append(string.strip())
        stringList.reverse()

        #make catList by popping strings off stringList until we hit '---'
        for i in range(0, len(stringList)):
            string = stringList.pop()

            if string == '---':
                break
            else:
                catList.append(string)

        #Fill categories
        for category in catList:
            newList = []
            for i in range(0, len(stringList)):
                string = stringList.pop()

                if string == '---':
                    break
                else:
                    newList.append(string)

            textParsed[category] = newList

        return textParsed

class Scene(object):

    def __init__(self):
        '''sets up variables with null values'''
        self.sceneType = 'NULL'
        self.flavStr = "null"
        self.optStr = "null"
        self.scenePaths = []

class Start(Scene):

    def __init__(self):
        self.flavStr = ""
        for string in ourGame.strings['FIRST']:
            self.flavStr += '\n'
            self.flavStr += string
        self.optStr = "\nBefore you lies a dimly lit corridor. (1) to boldly go."
        self.scenePaths = [1]

1 个答案:

答案 0 :(得分:0)

这是时间问题。当你这样做

ourGame = Game('githyargi.txt')

然后首先创建Game实例,然后才将它分配给ourGame。

相反,将游戏传递给Scene的构造函数,并传递self,使其变为类似

self.scenes.append(Start(self))

请注意,您也无法执行scenes = [],然后在下一行设置scenes[0] - 空列表中没有元素0。