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| #!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Time : 2018/10/26 11:17
# @Author : Ropon
# @File : 26_01.py
# 选课作业
# total_course_list = []
#
# class Course:
# def __init__ (self,name,price,period):
# self.name = name
# self.price = price
# self.period = period
# class Student:
#
# func_list = [
# {'text':'选课','name':'select_course'},
# {'text':'查看课程','name':'show_selected_course'},
# {'text':'删除课程','name':'show_del_course'},
# ]
#
# def __init__ (self,name):
# self.name = name
# self.courses = []
# def select_course(self):
# for i,item in enumerate(total_course_list,1):
# print(i,item.name,item.price,item.period)
# num = int(input('请选择要选择的课程'))
# num = num - 1
# course_obj = total_course_list[num]
# if course_obj not in self.courses:
# self.courses.append(course_obj)
#
# def show_selected_course(self):
# print('查看课程')
# def show_del_course(self):
# print('删除课程')
#
# def run():
#
# for i in range(1,6):
# obj = Course('课程-%s'%i, 90, 90)
# total_course_list.append(obj)
#
# stu_name = input('请输入学生姓名')
# stu = Student(stu_name)
#
# while True:
# for i, item in enumerate(stu.func_list, 1):
# print(i, item['text'])
# num = int(input('请选择要执行的功能序号：'))
# num = num-1
# row = stu.func_list[num]
# name = row['name']
# func = getattr(stu,name)
# func()
#
# if __name__ == '__main__':
# run()
# 面向对象
# - 三大特性
# - 继承
# - 单继承
# class A(object):
# pass
# class B(A):
# pass
# - 多继承
# class A(object):
# pass
# class B(object):
# pass
# class C(A, B): # 先找左再找右
# pass
# -super() # 调用父类的方法)
# class A(object):
# a = 11
# b = 22
# def f1(self):
# print(self.a)
# class B(object):
# a = 33
# c = 44
# class C(A, B): # 先找左再找右
# b = 222
# def f2(self):
# super().f1()
# obj = C()
# obj.f2()
# - 封装
# - 数据封装
# class A(object):
# def __init__(self, a, b):
# self.a = a
# self.b = b
# obj = A(1, 2)
# print(obj.b)
# - 方法封装
# - 多态
# - 鸭子模型
# - 成员
# - 变量
# - 实例变量
# class A(object):
# def __init__(self, a):
# self.a = a
# - 类变量
# class A(object):
# a = 11
# - 方法
# - 实例方法
# class A(object):
# def f1(self):
# pass
# - 类方法
# class A(object):
# @classmethod
# def f2(cls):
# pass
# - 静态方法
# class A(object):
# @staticmethod
# def f3(a, b):
# return a, b
# -特殊方法
# - 属性
# - @property
# class A(object):
# @property
# def start(self):
# return 'start is ok'
# obj = A()
# print(obj.start)
# - 修饰符
# - 私有
# - 编写 变量和方法前加两个下划线_
# - 公有
# - 内置函数
# - issubclass()
# - isinstance()
# - type()
# - callable()
# - 反射
# - getattr()
# 匿名函数可以在类中使用
# class A(object):
# v = lambda self, x: x + 2
#
# # def v(self, x):
# # return x + 1
# obj = A()
# print(obj.v(2))
# 约束
# BaseMessage类用于约束，约束其派生类：保证派生类中必须编写send方法，不然执行可能就会报错。
# class BaseMessage(object):
# def send(self, text):
# raise NotImplementedError('.send() 必须被重写')
#
# class Email(BaseMessage):
# # def send(self, text):
# # print('发送邮件')
# pass
#
# obj = Email()
# obj.send(1)
# 抽象类 约束，约束继承它的派生类必须实现它其中的抽象方法。
# 如果说类是从一堆对象中抽取相同的内容而来的，那么抽象类就是从一堆类中抽取相同的内容而来的，内容包括数据属性和函数属性。
# from abc import ABCMeta, abstractmethod
# class Base(metaclass=ABCMeta): # 定义抽象类
# def f1(self):
# print('test')
#
# @abstractmethod # 定义抽象方法，无需实现功能
# def f2(self):
# pass
#
# class Foo(Base):
# def f2(self):
# print('ceshi')
#
# obj = Foo()
# obj.f2()
# 1.多继承问题
# 在继承抽象类的过程中，我们应该尽量避免多继承；
# 而在继承接口的时候，我们反而鼓励你来多继承接口
# 2.方法的实现
# 在抽象类中，我们可以对一些抽象方法做出基础实现；
# 而在接口类中，任何方法都只是一种规范，具体的功能需要子类实现
# 总结
# 1.接口及作用？
# java、c#中使用
# 2.python中使用抽象类+抽象方法实现接口类似约束
# 抽象类+抽象方法
# 人为抛出异常
# raise NotImplementedError(".send() 必须被重写.")
# 异常处理
# import os
#
# class ExistsError(Exception):
# pass
#
# class KeyInvalidError(Exception):
# pass
#
# def new_func(path, prev):
# """
# 去path路径的文件中，找到前缀为prev的一行数据，获取数据并返回给调用者。
# 1000,成功
# 1001,文件不存在
# 1002,关键字为空
# 1003,未知错误
# ...
# :return:
# """
# response = {'code':1000,'data':None}
# try:
# if not os.path.exists(path):
# raise ExistsError()
#
# if not prev:
# raise KeyInvalidError()
# pass
# except ExistsError as e:
# response['code'] = 1001
# response['data'] = '文件不存在'
# except KeyInvalidError as e:
# response['code'] = 1002
# response['data'] = '关键字为空'
# except Exception as e:
# response['code'] = 1003
# response['data'] = '未知错误'
# return response
#
#
# def func(path,prev):
# """
# 去path路径的文件中，找到前缀为prev的一行数据，获取数据并返回给调用者。
# 1000,成功
# 1001,文件不存在
# 1002,关键字为空
# 1003,未知错误
# ...
# :return:
# """
# response = {'code':1000,'data':None}
# try:
# if not os.path.exists(path):
# response['code'] = 1001
# response['data'] = '文件不存在'
# return response
# if not prev:
# response['code'] = 1002
# response['data'] = '关键字为空'
# return response
# pass
# except Exception as e:
# response['code'] = 1003
# response['data'] = '未知错误'
# return response
#
# def show():
# return 8
#
#
# def run():
# pass
#
# ret = func(r'D:\Ropon\Seafile\Work\python\code1\day25', 'ces')
# print(ret)
# 自定义异常
# class MyException(Exception):
# def __init__(self, code, msg):
# self.code = code
# self.msg = msg
# lst = [1, 2, 3]
# obj = MyException('1000', '操作异常')
# dic = {}
# try:
# # raise MyException(1000, '操作异常')
# num = int(input('请输入'))
# print(lst[num])
# except KeyError as obj:
# obj.code = '1111'
# obj.msg = 'KeyError'
# dic['code'] = obj.code
# dic['msg'] = obj.msg
# except ValueError as obj:
# obj.code = '2222'
# obj.msg = 'ValueError'
# dic['code'] = obj.code
# dic['msg'] = obj.msg
# except IndexError as obj:
# obj.code = '3333'
# obj.msg = 'IndexError'
# dic['code'] = obj.code
# dic['msg'] = obj.msg
#
# print(dic)
# class MyException(Exception):
# def __init__(self, code, msg):
# self.code = code
# self.msg = msg
# try:
# raise MyException(1003, '路径不存在')
# except MyException as obj:
# print(obj.code, obj.msg)
# except Exception as obj:
# print(obj, '未知错误')
|