Introduction to using mvc design pattern in python

1. Code organization (directory structure)

2. MVC overview

MVC design pattern is the MVC framework.

The full name of MVC is Model View Controller, which is the abbreviation of model-view-controller. It is a software design model that uses an explicit separation of business logic and data. The method organizes the code and gathers the business logic into a component, so that the interface and user interaction around the data can be improved and personalized without the need to rewrite the business logic. MVC was uniquely developed to map traditional input, processing, and output functions into a logical graphical user interface structure.

3. Code

1. Data

#coding:utf-8

'''模拟数据，当然，这是一个元组。也可以是任意的数据库，只要你喜欢'''

Quotes = ('过放荡不羁的生活，容易得像顺水推舟，但是要结识良朋益友，却难如登天。 —— 巴尔扎克',
          '我读的书愈多，就愈亲近世界，愈明了生活的意义，愈觉得生活的重要。 —— 高尔基',
          '人生并不像火车要通过每个站似的经过每一个生活阶段。人生总是直向前行走，从不留下什么。 —— 刘易斯',
          '要永远觉得祖国的土地是稳固地在你脚下，要与集体一起生活，要记住，是集体教育了你。那一天你若和集体脱离，那便是末路的开始。 —— 奥斯特洛夫斯基',
          '在学校和生活中，工作的最重要的动力是工作中的乐趣，是工作获得结果时的乐趣以及对这个结果的社会价值的认识。 —— 爱因斯坦')

2. Model layer
Only the model layer can directly access data

#_*_coding:utf-8
from mvc.database.quote import Quotes #导入数据


class QuotesModel(object):
    '''模型层'''
    def get_quote(self,index):
        '''根据索引读取数据
        @parameter index 索引值
        '''
        try:
            valve = Quotes[index]
        except IndexError as err:
            valve = 'Not Found!'
        return valve

3. Control Device layer

#_*_coding:utf-8
from mvc.model.quote_model import QuotesModel
from mvc.view.quoteterminalview import QuoteTerminalView

class QuoteterminalController(object):
    '''控制器层'''
    def __init__(self):
        self.model = QuotesModel()
        self.view = QuoteTerminalView()

    def run(self):
        n = self.view.select_quote()
        try:
            index = int(n)
            quote = self.model.get_quote(index)
            self.view.show(quote)
        except ValueError as err:
            self.view.error('不合法的索引值')

4, view layer

#_*_coding:utf-8

class QuoteTerminalView(object):
    '''视图层'''
    def show(self, quote):
        '''显示查询结果
        @parameter quote 接收数据'''
        print('您查询到的名人名言是:%s' % (quote))

    def error(self, msg):
        '''打印错误消息
        @msg msg 接收错误消息'''
        print("error: %s" % (msg))

    def select_quote(self):
        '''读取用户的选择'''
        return raw_input("请输入编号进行查询:")

5, main program

#_*_coding:utf-8
'''主程序'''
from mvc.controller.quoteterminalcontroller import QuoteterminalController

def mains():
    while True:
        controller = QuoteterminalController()
        controller.run()

if __name__ == '__main__':
    mains()

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