Question

所以我正在开发一个程序，它曾经保存/加载很好，我有所有正确的导入等等，但是最近，当我尝试加载时，我一直收到此错误消息（和类似的保存期间一个：

Traceback (most recent call last):


 File "C:\Users\Adam\AppData\Local\Programs\Python\Python36\lib\shelve.py", line 111, in __getitem__
    value = self.cache[key]
KeyError: 'flipvariables'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):

File "C:\BascGames\ManorI\MANOR.py", line 241, in <module>
    flipvariables = sf['flipvariables']
  File "C:\Users\Adam\AppData\Local\Programs\Python\Python36\lib\shelve.py", line 113, in __getitem__
    f = BytesIO(self.dict[key.encode(self.keyencoding)])
  File "C:\Users\Adam\AppData\Local\Programs\Python\Python36\lib\dbm\dumb.py", line 147, in __getitem__
    pos, siz = self._index[key]     # may raise KeyError
KeyError: b'flipvariables'

抛出错误的代码（它在两个地方，两个不同的时间，但它们具有完全相同的代码 - 这是重载代码，使用SHELVE）：

flipvariables = {'papercomb': '', 'ropegiver': 'north', 'riddlenum': 1, 'theriddle': 'hi', 'riddleanswer': '?', 'passcode': '0', 'timesrealived': 0, 'rockkeydropped': 'no', 'maximumriddleguesses': 3, 'clutzmode': 'off', 'shortdesc': 'no', 'shortkeyss': {'qzz': 'die'}, 'shortkeys': ['qzz'], 'shortcommands': ['die'], 'saplasts': 5, 'riddlefailed': 'no', 'longdesc': 'no', 'waited': 0, 'intrivia': 'no', 'minimumtrivia': 2, 'goblinscore': 0, 'thicketscut': 'not', 'gascanfilled': 'no', 'lockout': 3, 'alarmactivated': 'on', 'holedug': 'no', 'wearinggloves': 'no', 'skeletonkicked': 'no', 'gettingtetanus': 'no', 'tetanusgotten': 'no', 'tetanusin': 3, 'turntoexplosion': 3, 'boatfixed': 'no', 'gargoylestatus': 'locked', 'safestatus': 'locked', 'disturbeddirtstatus': 'locked', 'scannerstatus': 'locked', 'toychestlookedat': 0, 'seedsplanted': 'no', 'flowersin': 4, 'flowersplanted': 'no'} 
#abridged version of the flipvariables mentioned in the code

first == input(">").lowercase()
if(first == 'reload'):
      slot = input("\nSavefile 1, 2 or 3? ").lower()
      if(slot == '1') or (slot == 'one'):
        cpon = os.path.isfile('C:\\BascGames\\ManorI\\SaveFiles\\1.dat')
      elif(slot == '2') or (slot == 'two'):
        cpon = os.path.isfile('C:\\BascGames\\ManorI\\SaveFiles\\2.dat')
      elif(slot == '3') or (slot == 'three'):
        cpon = os.path.isfile('C:\\BascGames\\ManorI\\SaveFiles\\3.dat')
      else:
        cpon = os.path.isfile('C:\\BascGames\\ManorI\\SaveFiles\\0.dat')
      if(cpon == False):
        print("\nThat savefile does not exist.")
      else:
        if(slot == '1') or (slot == 'one'):
          sf = shelve.open('C:\\BascGames\\ManorI\\SaveFiles\\1')
        elif(slot == '2') or (slot == 'two'):
          sf = shelve.open('C:\\BascGames\\ManorI\\SaveFiles\\2')
        elif(slot == '3') or (slot == 'three'):
          sf = shelve.open('C:\\BascGames\\ManorI\\SaveFiles\\3')
        else:
          sf = shelve.open('C:\\BascGames\\ManorI\\SaveFiles\\0')
          print("\nSavefile not avaliable. Opened savefile 0.\n")
        flipvariables = sf['flipvariables']
        inventory = sf['inventory']
        goblinstatuses = sf['goblinstatuses']
        roominventories = sf['roominventories']
        iteminventories = sf['iteminventories']
        health = sf['health']
        answersgot = sf['answersgot']
        avalweight = sf['avalweight']
        currentroom = sf['currentroom']
        yname = sf['yname']
        statuses = sf['statuses']
        gametoughness = sf['gametoughness']
        sf.close()
        print("\nReload sucessful!")
      flipvariables['roomchanged'] = 'yes'

有没有人知道这可能是什么以及如何解决它？提前致谢。我理解基础知识，它对线条意味着什么，但错误的基本思想对我来说没有意义。谢谢！

Answer 1

键错误是指字典的键不存在时。例如，

person = {name: 'joe', age: 41}

如果我使用last_name调用密钥person['last_name']，Python将抛出KeyError，因为给定字典的密钥不存在。

在你的错误中： KeyError: b'flipvariables'表示给定字典不存在键flipvariables。

根据回溯中的行flipvariables = sf['flipvariables']，查看代码中的sf字典，查看flipvariables键是否存在，并在必要时添加。

保存/加载期间的Python KeyError

1 个答案: