No.003-Python-学习之路-Day2-pyc|color|三元运算|mod初识|Task_ShoppingCart

PYC

“.pyc”文件是python执行前进行的简单编译的保存文件

python文件运行过程:

第一次执行:

python会先进行简单编译并把编译结果(pyCodeObject)存在内存中   ====> 用python解释器解释pyCodeObject ====> 执行结束后，将pyCodeObject放入“.pyc”文件中；

第二次执行;

python会去找“.pyc”文件 ====> 找到后比较“.pyc”及“.py”文件的更新时间 ====> “.pyc”较新则直接解释并执行 ====> 过程中任何不成立，则同第一次执行；

Color

高亮显示方法:

开头部分: 33[显示方式;前景色;背景色m + 结尾部分: 33 [0m

显示方式: 0-默认值　　1-高亮　　22-非粗体　　4-下划线　　24-非下划线　　5-闪烁　　25-非闪烁　　7-反显　　27-非反显

前景色  :  30-黑色　　31-红色　　32-绿色　　33-黄色　　34-蓝色　　35-洋红　　36-青色　　37-白色

背景色  :  40-黑色　　41-红色　　42-绿色　　43-黄色　　44-蓝色　　45-洋红　　46-青色　　47-白色

print("33[0mHello World!!!")
#若没有尾部，则自此默认的输出变为设置中的样子
print("33[0:31mHello World!!!33[0m")
print("Hello World!!!")
print("33[1:31mHello World!!!33[0m")
print("33[4:34:41mHello World!!33[0m")

三元运算

#三元运算
a, b, c = 1, 3, 5
d = a if a > b else c
#等同于
if a > b:
    d = a 
else
    d = c

 MOD初识

OS mod(Operate System)

Python标准库中的一个用于访问操作系统功能的模块。

使用OS模块中提供的接口，可以实现跨平台访问。

通用操作:

1、获取平台信息

2、对目录的操作

3、判断操作

import os
# method-1
# 执行命令结果打印至屏幕，返回执行成功还是失败
cmd_res = os.system("dir")  
print("----->", cmd_res)

# 输入内存地址（内容存在的位置）
cmd_res = os.popen("dir")  
print("----->", cmd_res)

# 需要去该内存中去取
cmd_res = os.popen("dir").read()  
print("----->", cmd_res)

#新建目录
os.mkdir("new_dir")

#目录操作
print("获取目录下文件名:%s" % os.listdir(os.getcwd()))
os.rmdir("test_rename") #多级删除 os.removedirs()
os.mkdir("test_mkdir") #多级创建 os.makedirs()
os.chdir("test_mkdir")
print("删-增-变目录后:%s" % os.getcwd())
os.chdir("..")
os.rename("test_mkdir", "test_rename")
os.chdir("test_rename")
print("重命名目录后:%s" % os.getcwd())

Task-1:Shopping Cart

需求：

　　1.商家（添加，删除，修改商品）

　　2.用户（充值，购买商品）

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time     : 2019/11/13 20:27
# @Author   : Bruce Lee


# Input Your Money


class store(object):
    def __init__(self, name, price, goods_file):
        self.name = name
        self.price = price
        self.goods_file = goods_file
        self.single_good = ""
        # 载入商品文件
        self.gd = open(goods_file, "r", encoding="utf-8")
        self.goods = self.gd.readlines()
        self.gd.close()
        self.index = ""
        self.find_result = ""

    def show_goods(self):
        for self.index, self.single_good in enumerate(self.goods):
            self.single_good = self.single_good.strip().split(",")
            print("商品{index}	{name}{price}元".format(
                index=str(self.index + 1).zfill(3),
                name=self.single_good[0].ljust(6, "　"),
                price=self.single_good[1].rjust(5, " ")
            ).expandtabs(10))

    def add_goods(self):
        for self.single_good in self.goods:
            self.find_result = self.single_good.find(self.name)
            if self.find_result >= 0:
                break
        if self.find_result == -1:
            self.goods.append("{name},{price}
".format(name=self.name, price=self.price))
            self.gd = open(goods_file, "w", encoding="utf-8")
            self.gd.writelines(self.goods)
            self.gd.close()
            print(self.goods)
        else:
            print("已有商品请忽重复添加！！")

    def del_goods(self):
        for self.single_good in self.goods:
            self.find_result = self.single_good.find(self.name)
            if self.find_result == -1:
                continue
            else:
                self.goods.remove(self.single_good)
                self.gd = open(goods_file, "w", encoding="utf-8")
                self.gd.writelines(self.goods)
                self.gd.close()
                print("已删除商品-%s" % self.name)
                break

    def edit_goods(self):
        for self.index, self.single_good in enumerate(self.goods):
            self.find_result = self.single_good.find(self.name)
            if self.find_result == -1:
                continue
            else:
                self.goods[self.index] = "{name},{price}
".format(
                    name=self.name,
                    price=self.price
                )
                self.gd = open(goods_file, "w", encoding="utf-8")
                self.gd.writelines(self.goods)
                self.gd.close()
                print("已修改商品[%s]的价格为%s元" % (self.name, self.price))
                break


class customer(object):
    def __init__(self, name, balance, customers_file):
        self.customer_name = name
        self.ct = open(customers_file, "r", encoding="utf-8")
        self.customers = self.ct.readlines()
        self.ct.close()
        self.find_result = ""
        self.customers_list = []
        self.balance = balance
        self.recharge = ""
        for self.customer in self.customers:
            self.customer = self.customer.strip().split(",")
            self.customers_list.append(self.customer)

    def show_customers(self):
        for self.customer in self.customers_list:
            print("用户[%s]" % self.customer[0])

    def get_balance(self):
        for self.customer in self.customers_list:
            if self.customer[0] == self.customer_name:
                self.balance = self.customer[1]
                break
            else:
                self.balance = "-1"
        return self.balance

    def recharge1(self):
        while True:
            self.recharge = input("请输出您充值的金额:")
            if self.recharge.isdigit():
                self.recharge = int(self.recharge)
                break
            elif self.recharge == "":
                print("输入不可为空！！")
            else:
                print("您的输入有误，请重新输入！！")
        for self.single_customer_index, self.single_customer in enumerate(self.customers):
            self.find_result = self.single_customer.find(self.customer_name)
            if self.find_result == -1:
                continue
            else:
                self.balance = 0
                self.single_customer = self.single_customer.strip().split(",")
                self.balance = int(self.single_customer[1])
                self.balance += self.recharge
                self.single_customer[1] = str(self.balance)
                self.customers[self.single_customer_index] = ",".join(self.single_customer) + "
"
                self.ct = open(customers_file, "w", encoding="utf-8")
                self.ct.writelines(self.customers)
                self.ct.close()
                break
        print("用户名[%s]已充值%d元" % (self.customer_name, self.recharge))

    def after_shopping(self):
        for self.single_customer_index, self.single_customer in enumerate(self.customers):
            self.find_result = self.single_customer.find(self.customer_name)
            if self.find_result == -1:
                continue
            else:
                self.customers[self.single_customer_index] = "{name},{balance}
".format(
                    name=self.customer_name,
                    balance=self.balance
                )
                self.ct = open(customers_file, "w", encoding="utf-8")
                self.ct.writelines(self.customers)
                self.ct.close()
        print("用户名[%s]的账户余额为%s元" % (self.customer_name, self.balance))


goods_file = "D:\资料存放\PythonObjects\day2\goods_list.txt"
customers_file = "D:\资料存放\PythonObjects\day2\customers.txt"
spend = 0

while True:
    choice = input("角色列表:
1.商家
2.客户
3.退出
您的选择是:")
    if choice == "1":
        print("进入商家操作模式
")
        while True:
            choice_store = input("商家操作列表:
1.展示
2.添加
3.删除
4.编辑
5.退出
您的选择是:")
            if choice_store == "1":
                store_show = store("", "", goods_file)
                store_show.show_goods()
                continue
            elif choice_store == "2":
                name = input("添加商品的名称:")
                price = input("添加商品的价格:")
                store_add = store(name, price, goods_file)
                store_add.add_goods()
                continue
            elif choice_store == "3":
                name = input("删除商品的名称:")
                store_del = store(name, "", goods_file)
                store_del.del_goods()
                continue
            elif choice_store == "4":
                name = input("修改商品的名称:")
                price = input("商品重新定价为:")
                store_edit = store(name, price, goods_file)
                store_edit.edit_goods()
                continue
            elif choice_store == "5":
                print("已退出商家模式
")
                break
            else:
                print("输入有误，请从新输入
")
                continue
    elif choice == "2":
        print("进入客户操作模式
")
        customer_balance = ""
        customer_name = ""
        goods_list = []
        shopping_list = []
        gd = open(goods_file, "r", encoding="utf-8")
        goods = gd.readlines()
        gd.close()
        for singe_goods in goods:
            goods_list.append(singe_goods.strip().split(","))
        print(goods_list)

        # 选择用户
        while True:
            customer_show = customer("", "", customers_file)
            customer_show.show_customers()
            customer_name = input("您选择哪个用户:")
            customer_get_balance = customer(customer_name, "", customers_file)
            if customer_get_balance.get_balance() == "-1":
                print("用户输入错误，请重新输入!")
                continue
            else:
                customer_balance = customer_get_balance.get_balance()
                print("您的余额是[{0}]".format(customer_balance))
                choice_recharge = input("是否充值y/n:")
                if choice_recharge == "y" or choice_recharge == "Y":
                    customer_recharge = customer(customer_name, "", customers_file)
                    customer_recharge.recharge1()
                    customer_get_balance = customer(customer_name, "", customers_file)
                    customer_balance = customer_get_balance.get_balance()
                customer_balance = int(customer_balance)
                break

        while True:
            print("商品列表如下:")
            store_show = store("", "", goods_file)
            store_show.show_goods()
            print("结账0")
            choice_customer = input("输入您要购买的商品:")
            if not choice_customer.isdigit():
                print("请输入正确的商品编号:")
                continue
            elif choice_customer == "0":
                new_balance = customer_balance-spend
                customer_settle = customer(customer_name, new_balance, customers_file)
                customer_settle.after_shopping()
                if not shopping_list:
                    print("购物车为空，未购买任何商品！")
                    print("已结账,您一共花费{spend}元，您的余额为{balance}元！".format(
                        spend=spend,
                        balance=new_balance
                    ))
                else:
                    print("-----您购买的商品如下:-----")
                    for buying_goods_index, buying_goods in enumerate(shopping_list):
                        print("商品{index}	{goods}	{price}".format(
                            index=buying_goods_index,
                            goods=buying_goods[0],
                            price=buying_goods[1]
                        ).expandtabs(20))
                    print("已结账,您一共花费{spend}元，您的余额为{balance}元！".format(
                        spend=spend,
                        balance=new_balance
                    ))
                break

            elif int(choice_customer) > len(goods_list):
                print("您输入的商品编号过大！")
                continue
            else:
                shopping_list.append(goods_list[int(choice_customer) - 1])
                print("已添加商品[%s]" % goods_list[int(choice_customer) - 1][0])
                spend = 0
                for item in shopping_list:
                    spend += int(item[1])
                if spend > customer_balance:
                    del_item = shopping_list.pop()
                    spend -= int(del_item[1])
                    print("您的余额不足了！！删除最新加入商品[%s]" % del_item[0])
                    continue

                print("-----您的余额为[{0}]-----".format(customer_balance-spend))
    elif choice == "3":
        print("已退出！！")
        break
    else:
        print("输入有误！！")