第一天：创建型模式--工厂方法模式

#使用python 自带的xml和json解析方法
import xml.etree.ElementTree as etree
import json
# Json 解析类
class JSONConnector:
    def __init__(self, filepath):
        self.data = dict()
        with open(filepath, mode='r', encoding='utf-8') as f:
            self.data = json.load(f)
    @property
    def parsed_data(self):
        return self.data
# Xml 解析类
class XMLConnector:
    def __init__(self, filepath):
        self.tree = etree.parse(filepath)
    @property
    def parsed_data(self):
        return self.tree
# 定义解析工厂方法
def connection_factory(filepath):
    # 根据后缀名判断传入的文件类型
    if filepath.endswith('json'):
        # 实例化Json解析类
        connector = JSONConnector
    elif filepath.endswith('xml'):
        # 实例化Xml解析类
        connector = XMLConnector
    else:
        # 如果不是两种格式，则抛出错误
        raise ValueError('Cannot connect to {} '.format(filepath))
    return connector(filepath)
# 包装工厂方法，增加异常拦截处理
def connect_to(filepath):
    factory = None
    try:
        factory = connection_factory(filepath)
    except ValueError as ve:
        print(ve)
    return factory
def main():
    sqlite_factory = connect_to('data/person.sp3')
    xml_factory = connect_to('data/contact_information.xml')
    xml_data = xml_factory.parsed_data
    persons = xml_data.findall(".//{}".format('person'))
    print('found: {} persons '.format(len(persons)))
    print('----------------------------------------------------')
    # 输出xml中的内容
    for ps in persons:
        print('姓名：{}'.format(ps.find('name').text))
        print('年龄：{}'.format(ps.find('age').text))
        for a in ps.find('addresses'):
            print('{}地址：{}'.format(a.attrib['type'], a.text))
        for p in ps.find('phoneNumbers'):
            print('{}电话：{}'.format(p.attrib['type'], p.text))
        print('----------------------------------------------------')
    json_factory = connect_to('data/donut.json')
    json_data = json_factory.parsed_data
    print('found:{} donuts '.format(len(json_data)))
    # 输出json内容
    for donut in json_data:
        print('name:{}'.format(donut['name']))
        print('price:${}'.format(donut['ppu']))
        [print('topping:{}'.format(t['id'], t['type'])) for t in donut['topping']]
        print('----------------------------------------------------')
if __name__ == '__main__':
    main()