在python中的pickle.load()之后如何关闭文件 [英] How to close the file after pickle.load() in python

问题描述

我以这种方式保存了一个python字典:

I saved a python dictionary in this way:

import cPickle as pickle

pickle.dump(dictname, open("filename.pkl", "wb"))

然后我以这种方式将其加载到另一个脚本中:

And I load it in another script in this way:

dictname = pickle.load(open("filename.pkl", "rb"))

此后如何关闭文件?

推荐答案

最好使用

It's better to use a with statement instead, which closes the file when the statement ends, even if an exception occurs:

with open("filename.pkl", "wb") as f:
    pickle.dump(dictname, f)
...
with open("filename.pkl", "rb") as f:
    dictname = pickle.load(f)

否则，只有在运行垃圾收集器时文件才会关闭，并且这种情况不确定并且几乎无法预测.

Otherwise, the file will only get closed when the garbage collector runs, and when that happens is indeterminate and almost impossible to predict.

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