为什么我得到“Pickle - EOFError: run out of input”读取一个空文件?

我得到一个有趣的错误，而试图使用Unpickler.load()，这是源代码:

open(target, 'a').close()
scores = {};
with open(target, "rb") as file:
    unpickler = pickle.Unpickler(file);
    scores = unpickler.load();
    if not isinstance(scores, dict):
        scores = {};

下面是回溯:

Traceback (most recent call last):
File "G:\python\pendu\user_test.py", line 3, in <module>:
    save_user_points("Magix", 30);
File "G:\python\pendu\user.py", line 22, in save_user_points:
    scores = unpickler.load();
EOFError: Ran out of input

我正在读取的文件是空的。我如何避免得到这个错误，并得到一个空变量代替?

当前回答

您可以捕获该异常并从那里返回您想要的任何内容。

open(target, 'a').close()
scores = {};
try:
    with open(target, "rb") as file:
        unpickler = pickle.Unpickler(file);
        scores = unpickler.load();
        if not isinstance(scores, dict):
            scores = {};
except EOFError:
    return {}

2014-07-16 22:39:26

其他回答

您可以捕获该异常并从那里返回您想要的任何内容。

open(target, 'a').close()
scores = {};
try:
    with open(target, "rb") as file:
        unpickler = pickle.Unpickler(file);
        scores = unpickler.load();
        if not isinstance(scores, dict):
            scores = {};
except EOFError:
    return {}

2014-07-16 22:39:26

我会先检查文件是否为空:

import os

scores = {} # scores is an empty dict already

if os.path.getsize(target) > 0:      
    with open(target, "rb") as f:
        unpickler = pickle.Unpickler(f)
        # if file is not empty scores will be equal
        # to the value unpickled
        scores = unpickler.load()

同样，open(target， 'a').close()在你的代码中什么也不做，你不需要使用;。

2014-07-16 22:45:08

也有同样的问题。原来，当我写入pickle文件时，我没有使用file.close()。插入这一行，错误就不再存在了。

2022-03-03 06:06:07

如你所见，这实际上是一个自然错误。

从Unpickler对象中读取数据的典型构造如下所示。

try:
    data = unpickler.load()
except EOFError:
    data = list()  # or whatever you want

简单地引发EOFError，因为它正在读取一个空文件，它只是意味着文件结束。

2014-07-16 23:23:03

if path.exists(Score_file):
      try : 
         with open(Score_file , "rb") as prev_Scr:

            return Unpickler(prev_Scr).load()

    except EOFError : 

        return dict()

2018-03-30 21:19:17

为什么我得到“Pickle - EOFError: run out of input”读取一个空文件?

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