pickle的用法

pickle模块用来序列化数据的，下面的例子摘自python自带文档
For the simplest code, use the dump() and load() functions. Note that a self-referencing list is  pickled and restored correctly.

import pickledata1 = {'a': [1, 2.0, 3, 4+6j],         'b': ('string', u'Unicode string'),         'c': None}selfref_list = [1, 2, 3]selfref_list.append(selfref_list)
output = open('data.pkl', 'wb')# Pickle dictionary using protocol 0.pickle.dump(data1, output)# Pickle the list using the highest protocol available.pickle.dump(selfref_list, output, -1)output.close()
The following example reads the resulting pickled data. When reading
a pickle-containing file, you should open the file in binary mode
because you can't be sure if the ASCII or binary format was used.

import pprint, pickle
pkl_file = open('data.pkl', 'rb')data1 = pickle.load(pkl_file)pprint.pprint(data1)
data2 = pickle.load(pkl_file)pprint.pprint(data2)pkl_file.close()