Python shelve module

Import Shelvedef createdata ():    try:        db = Shelve.open (' shelve_test ')        # Key with value must be string        db[' int '] = 1        db[' float '] = 2.3        db[' string '] = "I like python."        db[' key ' = ' value '    finally:        db.close () def loaddata ():                       #这个可以另外写一个. py file to read    db = Shelve.open (' Shelve _test ') for    item in Db.items (): Print (        item)    Print (db[' int ')) print (    db[' float '))    print (db [' String '])    Print (db[' key '))    db.close () if __name__ = = ' __main__ ':    createdata ()    loaddata ()

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

Pickle write: Open a file descriptor in write mode, call Pickle.dump to write the object in

Import Pickledn = {' Baidu ': ' www.baidu.com ', ' qq ': ' www.qq.com ', ' a ': ' www.360.cn '}name = [' Mayun ', ' Mahuateng ', ' Liyanhong ']f = open (' A.txt ', ' WB ')  # ' WB ' is written in binary pickle.dump (dn,f)      # #写一个对象pickle. Dump (name,f) #  # Write one More object F.close () read: Open file descriptor in read mode, call Pickle.load Load Object f = open (' a.txt ', ' RB ')    # ' WB ' read pickle.load (f)             # # Load an object Pickle.load (f)             # #加载另一个对象f. Close ()

Python shelve module