Python中shelve模块的简单介绍（附示例）

import shelve
date = 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 : Presly
mather : Vera
baby : [123，345]

import shelve


def 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 cmd


def 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()