三层结构举例

- 三层架构
- 用户视图层
- 用于与用户进行交互
- 接收用户输入的内容
- 打印输出内容给用户
- 简单的逻辑处理

            
- 逻辑接口层
- 核心业务逻辑，相当于用户视图与数据处理层的桥梁
- 接收视图层传递过来的参数进行逻辑处理
- 返回结果给视图层
        
- 数据处理层
- 做数据的 
- 增
- 删
- 查
- 改

- ATM 项目根目录
    - readme.md  项目的说明书

    - start.py  项目启动文件

import sys
import os
from core import src
sys.path.append(os.path.dirname(__file__))
if __name__ == '__main__':
    src.run()

    - conf  配置文件
        - settings.py

import os
BASE_PATH=os.path.dirname(os.path.dirname(__file__))
USER_DATA_PATH=os.path.join(BASE_PATH,'db','user_data')

"""
logging配置
"""

# 定义三种日志输出格式 开始
standard_format = '[%(asctime)s][%(threadName)s:%(thread)d][task_id:%(name)s][%(filename)s:%(lineno)d]' 
                  '[%(levelname)s][%(message)s]'  # 其中name为getlogger指定的名字
simple_format = '[%(levelname)s][%(asctime)s][%(filename)s:%(lineno)d]%(message)s'
id_simple_format = '[%(levelname)s][%(asctime)s] %(message)s'

# 定义日志输出格式 结束
# ****************注意1: log文件的目录
BASE_PATH = os.path.dirname(os.path.dirname(__file__))
logfile_dir = os.path.join(BASE_PATH, 'log')
# print(logfile_dir)

# ****************注意2: log文件名
logfile_name = 'atm.log'

# 如果不存在定义的日志目录就创建一个
if not os.path.isdir(logfile_dir):
    os.mkdir(logfile_dir)

# log文件的全路径
logfile_path = os.path.join(logfile_dir, logfile_name)

LOGGING_DIC = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'standard': {
            'format': standard_format
        },
        'simple': {
            'format': simple_format
        },
    },
    'filters': {},
    'handlers': {
        # 打印到终端的日志
        'console': {
            'level': 'DEBUG',
            'class': 'logging.StreamHandler',  # 打印到屏幕
            'formatter': 'simple'
        },
        # 打印到文件的日志,收集info及以上的日志
        'default': {
            'level': 'DEBUG',
            'class': 'logging.handlers.RotatingFileHandler',  # 保存到文件
            'formatter': 'standard',
            'filename': logfile_path,  # 日志文件
            'maxBytes': 1024 * 1024 * 5,  # 日志大小 5M
            'backupCount': 5,
            'encoding': 'utf-8',  # 日志文件的编码，再也不用担心中文log乱码了
        },
    },
    'loggers': {
        # logging.getLogger(__name__)拿到的logger配置
        '': {
            'handlers': ['default', 'console'],  # 这里把上面定义的两个handler都加上，即log数据既写入文件又打印到屏幕
            'level': 'DEBUG',
            'propagate': True,  # 向上（更高level的logger）传递
        },
    },
}

    - lib   公共方法文件
        - common.py

import hashlib
from core import src
import logging.config
from conf import settings
def pwd5(password):
    pwd_5=hashlib.md5
    pwd_5.update(password.encode('utf-8'))
    salt='乳酸菌，喝了这一瓶，还有下一瓶'
    pwd_5.update(salt.encode('utf-8'))
    return pwd_5.hexdigest()

def auth(fiunc):
    def inner(*args,**kwargs):
        if src.Login_user:
            res=auth(*args,**kwargs)
            return res
        else:
            print('您目前尚未登录，无法操作该功能！')
            src.login()
    return inner

def logger(type):
    logging.config.dictConfig(settings.LOGGING_DIC)
    logger=logging.getLogger(type)
    return  logger

    - core（用户视图层）  存放用户视图层代码文件
        - src.py

from interface import user_interface
from lib import common
from interface import shop_interface
from interface import bank_interface
Login_user=None
def register():
    while True:
        username=input('请输入用户名称：').strip()
        passwoed=input('请输入用户密码：').strip()
        r_passwoed=input('请输入用户密码：').strip()
        if passwoed == r_passwoed:
            print('恭喜您，注册成功！')
            flag,msg=user_interface.register_interface(username,passwoed)
            if flag:
                print(msg)
                break
            else:
                print(msg)

def login():
    while True:
        username = input('请输入用户名称：').strip()
        passwoed = input('请输入用户密码：').strip()
        flag, msg = user_interface.log_interface(username, passwoed)
        if flag:
            print(msg)
            global Login_user
            Login_user=username
            break
        else:
            print(msg)

@common.auth
def check_balance():
    amount=user_interface.check_balance_interface(Login_user)
    print(f'用户：{Login_user}目前账户余额为{amount}')

@common.auth
def withdraw():
    while True:
        out_money=input('请输入提现金额：').strip()
        if not out_money.isdigit():
            print('请重新输入：')
            continue
        else:
            flag,msg=bank_interface.withdraw_interface(Login_user,out_money)
            if flag:
                print(msg)
                break
            else:
                print(msg)

@common.auth
def repayment():
    while True:
        in_money=input('请输入还款金额：').strip()
        if not in_money.isdigit():
            print('请重新输入：')
            continue
        in_money=float(in_money)
        if in_money > 0:
            flag,msg=bank_interface.repayment_interface(Login_user,in_money)
            if flag:
                print(msg)
                break

@common.auth
def transfer():
    while True:
        to_username = input('请输入用户名称：').strip()
        in_money = input('请输入还款金额：').strip()
        if not in_money.isdigit():
            print('请重新输入：')
            continue
        in_money=float(in_money)
        if in_money > 0:
            flag,msg=bank_interface.repayment_interface(Login_user,to_username,in_money)
            if flag:
                print(msg)
                break
            else:
                print(msg)

@common.auth
def check_flow():
    while True:
        flag,msg=bank_interface.check_flow_interface(Login_user)
        if flag:
            print(msg)
            break
        else:
            print(msg)

@common.auth
def shopping():
    while True:
        shop_list = [
            ['凤爪', 30],
            ['三友凤爪', 250],
            ['泡椒凤爪', 28],
            ['山东凤爪', 15],
            ['陕西凤爪', 100000],
            ['好吃的凤爪', 1]
        ]
        car={}
        for index,shop in enumerate(shop_list):
            shop_name,shop_price=shop
            print(f'编号：{index}',f'商品:{shop_name}'f'单价：{shop_price}')
        choice=input('请输入商品编号（是否结账输入y or n）：').strip()
        if choice == 'y':
            if not car:
                print('当前购物车无商品！')
                continue
            flag, msg = shop_interface.shopping_interface(Login_user,car)
            if flag:
                print(msg)
                break
            else:
                print(msg)
        elif choice == 'n':
            if not car:
                print('当前无购物车！')
                continue
            flag, msg =shop_interface.add_car(Login_user,car)
            if flag:
                print(msg)
                break
        if not choice.isdigit():
            print('命令不存在，请重新输入！')
            continue
        choice = int(choice)
        if choice not in range(len(shop_list)):
            print('命令不存在，请重新输入！')
            continue
        shop_name, shop_price=shop_list[choice]
        if shop_name in car:
            car[shop_name][1]+=1
        else:
            car[shop_name]=[shop_price,1]
        print(f'当前购物车:{car}')

@common.auth
def check_shopping_car():
    shop_car=shop_interface.check_shopping_car_interface(Login_user)
    print(shop_car)

@common.auth
def change_shopping_car():
    while True:
        flag, msg=shop_interface.change_shopping_car_interface(Login_user)
        if flag:
            print(msg)
            break
        else:
            print(msg)

@common.auth
def admin():
    from core import admin
    admin.admin_run()

func_dic={
    '1': register,
    '2': login,
    '3': check_balance,
    '4': withdraw,
    '5': repayment,
    '6': transfer,
    '7': check_flow,
    '8': shopping,
    '9': check_shopping_car,
    '10':change_shopping_car,
    '11': admin
}
def run():
    while True:
        print('''
        ===== 欢迎来到本网站 =====
            1、注册功能
            2、登录功能
            3、查看余额
            4、提现功能
            5、还款功能
            6、转账功能
            7、查看流水
            8、购物功能
            9、查看购物车
            10、修改购物车
            11、管理员功能
        ========= end =========
        ''')
        choice=input('请输入命令编号（纯数字）：').strip()
        if choice not in func_dic:
            print('请正确输入命令编号！')
            continue
        else:
            func_dic.get(choice)()

        -admin.py    

from core import src
from interface import admin_interface
def add_user():
    src.register()

def change_balance():
    while True:
        change_username=input('请输入需要修改的用户名称：').strip()
        amount=input('请输入修改后的额度：').strip()
        r_amount=input('请确认修改后的额度：').strip()
        if amount != r_amount:
            print('请重新输入：')
            continue
        else:
            if not amount.isdigit():
                continue
            flag, msg =admin_interface.change_balance_intwerface(change_username,amount)
            if flag:
                print(msg)
                break
            else:
                print(msg)

def lock_user():
    while True:
        lock_username = input('请输入需要冻结的用户名称：').strip()
        flag, msg = admin_interface.lock_user_interface(lock_username)
        if flag:
            print(msg)
            break
        else:
            print(msg)

admin_dic = {
    '1': add_user,
    '2': change_balance,
    '3': lock_user,
}

def admin_run():
    while True:
        print('''
            1、添加账户
            2、修改额度
            3、冻结账户
            ''')
        choice = input('请输入管理员功能编号: ').strip()
        if choice not in admin_dic:
            print('请输入正确的功能编号!')
            continue
        admin_dic.get(choice)()

    - interface（逻辑接口层）   存放核心业务逻辑代码
        - user_interface.py   用户相关的接口

from db import db_handler
from lib import common
user_logger=common.logger(log_type='user')
def register_interface(username,password,balance=15000):
    user_dic=db_handler.select(username)
    if user_dic:
        return False,'用户名存在！'
    password=common.pwd5(password)
    user_dic = {
        'username': username,
        'password': password,
        'balance': balance,
        'flow': [],
        'shop_car': {},
        'locked': False
    }
    db_handler.save(user_dic)
    msg=f'{username}注册成功！'
    user_logger.info(msg)
    return True,msg

def log_interface(username,password):
    user_dic = db_handler.select(username)
    if user_dic:
        if user_dic('locked'):
            return False,'当前用户已被锁定'
        password=common.pwd5(password)
        if password == user_dic.get('password'):
            msg=f'用户：{user_dic}登陆成功！'
            user_logger.info(msg)
            return True,msg
        else:
            msg='用户名不存在，请重新输入！'
            user_logger.warn(msg)
            return False,msg
    msg=f'用户名{username}不存在，请重新输入'
    return msg

def check_balance_interface(username):
    user_dic = db_handler.select(username)
    return user_dic['balance']

        - bank_interface.py   银行相关的接口

from db import db_handler
from lib import common
bank_logger=common.logger(log_type='bank')
def withdraw_interface(username,out_count):
    user_dic = db_handler.select(username)
    balance=float(user_dic.get('balance'))
    money=float(out_count) * 1.05
    if balance >= money:
        balance -= money
        flow=f'用户{username}成功提现{out_count}手续费为{money-float(out_count)}'
        user_dic.get('flow').append(flow)
        user_dic[balance]=balance
        db_handler.save(user_dic)
        bank_logger.info(flow)
        return True,flow
    return False,'当前余额不足！'

def repayment_interface(username,in_money):
    user_dic = db_handler.select(username)
    user_dic['balance'] += in_money
    flow = f'用户{username}充值{in_money}成功！'
    user_dic.get('flow').append(flow)
    db_handler.save(user_dic)
    bank_logger.info(flow)
    return True,flow

def transfer_interface(username,to_username,in_money):
    user_dic1 = db_handler.select(username)
    user_dic2 = db_handler.select(to_username)
    if not user_dic2:
        return False,'对方账户不存在！'
    if user_dic1['balance'] >= in_money:
        user_dic1['balance'] -= in_money
        user_dic2['balance'] += in_money
        flow1 = '用户{username}给用户{to_username}转账{in_money}成功！'
        user_dic1.get('flow').append(flow1)
        db_handler.save(user_dic1)
        flow2 = '用户{to_username}收到汇款{in_money}！'
        user_dic2.get('flow').append(flow2)
        db_handler.save(user_dic2)
        bank_logger.info(flow1)
        return True,flow1
    return False,'余额不足！'

def check_flow_interface(username):
    flow_list = db_handler.select(username).get('flow')
    if flow_list:
        return True,flow_list
    else:
        msg=f'{username}当前没有流水！'
        bank_logger.info(msg)
        return False,msg

def pay_interface(username, cost):
    user_dic = db_handler.select(username)
    if user_dic.get('balance') >= cost:
        user_dic['balance'] -= cost
        # 清空购物车,清空购物车字典
        user_dic['shop_car'].clear()
        db_handler.save(user_dic)
        return True
    return False

        - shop_interface.py   购物相关的接口

from db import db_handler
from lib import common
shop_logger=common.logger(log_type='shop')
def shopping_interface(username,car):
    cost=0
    for shop in car.values():
        price,count=shop
        cost += (price*count)
    from interface import bank_interface
    flag=bank_interface.pay_interface(username,cost)
    if flag:
        msg = '支付成功，商家正在准备！'
        shop_logger.info(msg)
        return True,
    return False,'当前账户余额不足！'

def add_car(username,car):
    user_dic = db_handler.select(username)
    shop_car=user_dic.get('shop_car')
    for shop_name,data in car.items():
        number=data[1]
        if shop_name in shop_car:
            user_dic['shop_car'][shop_name][1] += number
        else:
            user_dic['shop_car'].updata(shop_name,data)
    db_handler.save(user_dic)
    msg = '购物车添加成功！'
    shop_logger.info(msg)
    return True,msg

def check_shopping_car_interface(username):
    user_dic = db_handler.select(username)
    return user_dic.get('shop_car')

def change_shopping_car_interface(username):
    user_dic = db_handler.select(username)
    shop_car = user_dic.get('shop_car')
    if shop_car:
        for shop_name,data in shop_car.items():
            number=data[1]
            shopname=input('请输入需要修改个数的商品名称：').strip()
            count=input('请输入需要修改后的个数：').strip()
            if not count.isdigit():
                print('请重新输入：')
                continue
            user_dic['shop_car'][shopname][1]=count
        db_handler.save(user_dic)
        msg = '购物车修改成功！'
        shop_logger.info(msg)
        return True, msg
    return False,'当前购物车为空！'

　　　　 - admin_interface.py   管理员相关的接口

from db import db_handler
from lib import common
admin_logger=common.logger(log_type='admin')
def change_balance_intwerface(username,money):
    user_dic = db_handler.select(username)
    if user_dic:
        user_dic['balance']=float(money)
        msg=f'用户{username}额度修改成功！'
        admin_logger.info(msg)
        return True,msg
    return False,f'用户{username}不存在！'

def lock_user_interface(username):
    user_dic = db_handler.select(username)
    if user_dic:
        user_dic['locked'] = True
        db_handler.save(user_dic)
        msg = f'用户{username}冻结成功！'
        admin_logger.info(msg)
        return True, msg

    return False, f'冻结用户{username}不存在!'

    - db（数据处理层）  存放数据与数据处理层代码
        - db_handler.py  数据处理层代码

import json
import os
from conf import settings
def select(username):
    user_path = os.path.join(settings.USER_DATA_PATH, f'{username}.json')
    if os.path.exists(user_path):
        with open(user_path, mode='rt', encoding='utf-8')as f:
            user_dict=json.load(f)
            return user_dict

def save(user_dic):
    username=user_dic.get('username')
    user_path = os.path.join(
        settings.USER_DATA_PATH, f'{username}.json'
    )
    with open(user_path, 'w', encoding='utf-8') as f:
        json.dump(user_dic, f, ensure_ascii=False)

        - user_data  用户数据
        
    - log  存放日志文件