为什么我得到“Pickle - EOFError: Ran out of input"?读取空文件? [英] Why do I get "Pickle - EOFError: Ran out of input" reading an empty file?

问题描述

我在尝试使用 Unpickler.load() 时遇到一个有趣的错误，这是源代码:

I am getting an interesting error while trying to use Unpickler.load(), here is the source code:

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

这是回溯:

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

我试图读取的文件是空的.我怎样才能避免出现这个错误，而是得到一个空变量?

The file I am trying to read is empty. How can I avoid getting this error, and get an empty variable instead?

推荐答案

我会先检查文件是否为空:

I would check that the file is not empty first:

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()

还有 open(target, 'a').close() 在你的代码中什么都不做，你不需要使用 ;.

Also open(target, 'a').close() is doing nothing in your code and you don't need to use ;.

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