Python's method of using shelve module to implement simple data storage

This article illustrates how Python uses the shelve module to implement simple data storage. Share to everyone for your reference. The specific analysis is as follows:

Python's shelve module provides a simple data storage scheme to manipulate data in the form of a dict (dictionary).

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#!/usr/bin/python import sys, shelve def store_person (db): "" "Query User for data and store it in the shelf object" " PID = raw_input (' Enter unique ID number: ') person = {} person[' name ' = Raw_input (' Enter name: ') person[' age ' = Raw_input (' Enter Age: ') person[' phone '] = raw_input (' Enter phone number: ') db[pid] = person def lookup_person (db): "" "Query user F or ID and desired field, and fetch the corresponding data from the shelf object "" "pid = Raw_input (' Enter unique ID Numbe R: ') temp = db[pid] field = raw_input (' Please enter name, age or Phone: ') Field.strip (). Lower () print field.capitalize () + ': ', Temp[field] def print_help (): print ' The avaliable commands are: ' print ' store:stores infomation about a person ' p Rint ' Lookup: Looks up a person form ID number ' print ' Quit:save changes and exit ' print '? :P rints This message ' Def enter_command (): cmd = raw_input (' Enter command (? to help): ' "cmd = Cmd.strip (). Lower () return cmd def main (): Database = Shelve.open (' database ') # database stores in current directory try:while True:cmd = enter_com Mand () if cmd = = ' Store ': Store_person (database) elif cmd = = ' Lookup ': Lookup_person (database) elif cmd = = '? ': Print_help () elif cmd = = ' quit ': Return Finally:database.close () # Close to any condition if __name__ = ' __main__ ': Main ( )

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