Usage of Python pickle and shelve modules

1.pickle

Write: Open a file descriptor in write mode, call Pickle.dump to write the object in
Copy the Code code as follows:

DN = {' Baidu ': ' www.baidu.com ', ' qq ': ' www.qq.com ', ' a ': ' www.360.cn '}

name = [' Mayun ', ' Mahuateng ', ' Liyanhong ']

f = open (R ' C:\a.txt ', ' W ')

Pickle.dump (dn,f) # #写一个对象

Pickle.dump (name,f) # #再写一个对象

F.close ()

READ: Open file descriptor as read, call Pickle.load Load Object

f = open (R ' C:\a.txt ')

Pickle.load (f) # #加载一个对象

Pickle.load (f) # #加载另一个对象

F.close ()

2.shelve

The shelve module is simpler than the Pickle module, with only one open function, which returns a dictionary-like object, readable and writable
Copy the Code code as follows:

F = Shelve.open (R ' C:\b.txt ')

F # #返回空字典

f[' baidu '] = ' www.baidu.com '

f[' qq '] = ' www.qq.com '

f[' www.360.cn ') = '

F # #返回字典

F.close ()

F = Shelve.open (R ' C:\b.txt ')

F # #返回字典f

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