Python uses the shelve module to implement simple data storage

Python uses the shelve module to implement simple data storage

This example describes how Python uses the shelve module to implement simple data storage. Share it with you for your reference. The specific analysis is as follows:

The shelve module of Python provides a simple data storage solution that operates data in the form of 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 for ID and desired field, And fetch the corresponding data From the shelf object """ Pid = raw_input ('enter unique ID number :') 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' Print 'lookup: Looks up a person form ID number' Print 'Quit: Save changes and exit' Print '? : Prints this message' Def enter_command (): Cmd = raw_input ('enter command (? For help ):') Cmd = cmd. strip (). lower () Return cmd Def main (): Database = shelve. open ('database ') # Database stores in current directory Try: While True: Cmd = enter_command () If cmd = 'store ': Store_person (database) Elif cmd = 'lookup ': Lookup_person (database) Elif cmd = '? ': Print_help () Elif cmd = 'quit ': Return Finally: Database. close () # Close database in any condition If _ name _ = '_ main __': Main ()

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