Python中shelve模块的简单介绍（附示例）

import shelvedate = shelve.open('family.txt')         # Python的自处理系统会自动生成三个文件date['father'] = 'Presly'                        # 默认为创建并且写入“c”date['mather'] = 'Vera'date['baby'] = [123, ]date.close()m = shelve.open('family.txt', falg= 'r', writebake=True)          # 当writebake设置为True时，文件里才能直接添加print(m['baby']) m['baby'].append(345)print(m['father'])print('-------------') for key, value in m.items():           # 以字典的格式     print(key, ':', value) m.close()

[123]Presly-------------father : Preslymather : Verababy : [123，345]

import shelvedef store_information(database):    info = {}    ID = input('Enter the ID number:')    info['name'] = input('Enter the name:')         # 将name ,age , phone 存入字典info里    info['age'] = input('Enter the age:')    info['phone'] = input('Enter the phone:')    database[ID] = info                            # 用ID ： info 存入 database文件def lookup_information(database):    ID = input('Enter the ID:')    field = input('What would you like to know?(name,age,phone)')    field = field.strip().lower()    print(database[ID][field])              # 通过输入的ID与 field 直接打印结果def print_help():    print('Please enter the help command:')    print('store  :store informatinon to database')    print('lookup :look up information by numID')    print('quit   :save information and quit')    print('?      :print help command')def enter_command():    cmd = input('Enter command (? for help)')    cmd = cmd.strip().lower()    return cmddef main():    database = shelve.open('db.dat')    try:        while True:            cmd = enter_command()            if cmd == 'store':                store_information(database)           # 当if函数结束，自动跳转到cmd = enter_command()行            elif cmd == 'lookup':                lookup_information(database)            elif cmd == '?':                print_help()            elif cmd == 'quit':                return                            # 跳出while循环    finally:        database.close()if __name__ == '__main__': main()