将数据结构持久保存到python中的文件的最简单方法? [英] Easiest way to persist a data structure to a file in python?

问题描述

假设我有这样的东西:

d = { "abc" : [1, 2, 3], "qwerty" : [4,5,6] }

通过编程方式将其保存到以后可以从python加载的文件中最简单的方法是什么?

我能以某种方式将其另存为python源(从python脚本中，而不是手动！)，然后稍后再import保存吗?

还是我应该使用JSON之类的东西?

解决方案

使用 pickle 模块.

import pickle
d = { "abc" : [1, 2, 3], "qwerty" : [4,5,6] }
afile = open(r'C:\d.pkl', 'wb')
pickle.dump(d, afile)
afile.close()

#reload object from file
file2 = open(r'C:\d.pkl', 'rb')
new_d = pickle.load(file2)
file2.close()

#print dictionary object loaded from file
print new_d

Let's say I have something like this:

d = { "abc" : [1, 2, 3], "qwerty" : [4,5,6] }

What's the easiest way to progammatically get that into a file that I can load from python later?

Can I somehow save it as python source (from within a python script, not manually!), then import it later?

Or should I use JSON or something?

解决方案

Use the pickle module.

import pickle
d = { "abc" : [1, 2, 3], "qwerty" : [4,5,6] }
afile = open(r'C:\d.pkl', 'wb')
pickle.dump(d, afile)
afile.close()

#reload object from file
file2 = open(r'C:\d.pkl', 'rb')
new_d = pickle.load(file2)
file2.close()

#print dictionary object loaded from file
print new_d

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