Python基础-递归练习

# os模块:计算一个文件下所有的文件的大小,这个文件下面还有文件夹,不能用

import os


def dir_size(path):
    size = 0
    name_list = os.listdir(path)
    for name in name_list:
        abs_path = os.path.join(path, name)
        print(abs_path)
        if os.path.isfile(abs_path):
            size += os.path.getsize(abs_path)  # 获得文件大小
        else:
            ret = dir_size(abs_path)
            size = size + ret
    return size


# path = ‘D:\python\lanzou\day‘
# res = os.path.dirname(__file__)
# print(res)
# retdir = dir_size(res)
# print(retdir)


# os模块:计算一个文件夹下所有文件的大小.这个文件夹下面还有文件夹,不能用walk
# import os
# def dir_size(path):
#     size = 0
#     name_lst = os.listdir(path)
#     for name in name_lst:
#         abs_path = os.path.join(path,name)
#         if os.path.isfile(abs_path):
#             size += os.path.getsize(abs_path)
#         else:
#             ret = dir_size(abs_path)
#             size += ret
#     return size
#
# path = ‘D:\python_22‘
# ret = dir_size(‘D:\python_22\day03‘)

# 堆栈计算方式 能够不用递归只用循环

menu = {
    ‘北京‘: {
        ‘海淀‘: {
            ‘五道口‘: {
                ‘soho‘: {},
                ‘网易‘: {},
                ‘google‘: {}
            },
            ‘中关村‘: {
                ‘爱奇艺‘: {},
                ‘汽车之家‘: {},
                ‘youku‘: {},
            },
            ‘上地‘: {
                ‘百度‘: {},
            },
        },
        ‘昌平‘: {
            ‘沙河‘: {
                ‘老男孩‘: {},
                ‘北航‘: {},
            },
            ‘天通苑‘: {},
            ‘回龙观‘: {},
        },
        ‘朝阳‘: {},
        ‘东城‘: {},
    },
    ‘上海‘: {
        ‘闵行‘: {
            "人民广场": {
                ‘炸鸡店‘: {}
            }
        },
        ‘闸北‘: {
            ‘火车战‘: {
                ‘携程‘: {}
            }
        },
        ‘浦东‘: {},
    },
    ‘山东‘: {},
}


def formenu(menu):
    flag = True
    while flag:
        for last in menu:
            print(last)
        key = input(‘>>>>‘).strip()
        if menu.get(key):
            dic = menu[key]
            flag = formenu(dic)
        elif key.upper() == ‘B‘:
            return True
        elif key.upper() == ‘Q‘:
            return False
# formenu(menu)
# print(‘aaaaaaaaaa‘)

def menu_func(menu):
    flag = True
    while flag:
        for name in menu:
            print(name)
        key = input(‘>>>‘).strip()  # 北京
        if menu.get(key):
            dic = menu[key]
            flag = menu_func(dic)  # menu_func(menu[‘北京‘])
        elif key.upper() == ‘B‘:  # back回退   quit退出
            return True
        elif key.upper() == ‘Q‘:
            return False
# menu_func(menu)
# print(‘wahaha‘)

def menufunc(menu):
    while True:
        for name in menu:
            print(name)
        key = input(‘>>>‘).strip()  # 北京
        if menu.get(key):
            dic = menu[key]
            flag = menu_func(dic)  # menu_func(menu[‘北京‘])
            if not flag: return False
        elif key.upper() == ‘B‘:
            return True
        elif key.upper() == ‘Q‘:
            return False


menufunc(menu)