Python Module-Pickle module

Http://blog.csdn.net/pipisorry

Python's pickle module implements basic data sequence and deserialization. Through the serialization of the Pickle module we are able to save the object information running in the program to a file, to store it permanently, and through the Pickle module's deserialization, we are able to create from the file the last object saved by the program.

Basic interface:

Pickle.dump (obj, file, [, Protocol])
Note: Save the object, obj, to file.
Protocol is the protocol version used for serialization, the 0:ASCII protocol, the serialized object is represented by printable ASCII code, 1: The old binary protocol, and the new binary protocol introduced by version 2:2.3, which is more efficient than the previous ones. where protocols 0 and 1 are compatible with older versions of Python. The default value for protocol is 0.
File: Object to which the class files are saved. File must have a write () interface, file can be an open with a ' W ' method or an Stringio object or any other object that implements the write () interface. If protocol>=1, the file object needs to be opened in binary mode.

Pickle.load (file)
Note: Reads a string from file and reconstructs it as the original Python object.
File: Class files object with Read () and ReadLine () interfaces.

Example:

#to save a data object to a file using the Pickle moduleImportPickledata1 = {'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 ()

# To refactor a Python object from a file using the Pickle module  Import pprint, picklepkl_file = open ('data.pkl'RB ') Data1 = Pickle.load (pkl_file) pprint.pprint (data1) data2 = Pickle.load (pkl_file) pprint.pprint (data2) pkl_file.

From:http://blog.csdn.net/pipisorry

Ref:python Data Persistent Storage: Basic use of pickle modules

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