python练习笔记

python练习笔记，装饰器、定制方法生成特定的类

# -*- coding: utf-8 -*-

def catch_exception(func):

    def wrap(self, *args, **kw):

        try:

            return func(self, *args, **kw)

        except Exception:

            self.revive()

            print('An Exception raised')

    return wrap

class Test(object):

    # 初始化

    def __init__(self, path=''):

        self.__slots__ = ('v1','v2','a')

        self.__a = 123

        self.__b = 456

        self.a = 1

        self.__path = path

    # 使用len()

    def __len__(self):

        return 100

    # 使用迭代

    def __iter__(self):

        # return iter([1,2,3,4])

        return self

    def __next__(self):

        if self.a < 100:

            self.a *= 2

            return self.a

        else:

            raise StopIteration()

    # 使用数字下表直接访问

    def __getitem__(self, n):

        for i in range(n):

            self.a *= 2

        return self.a

    # 属性不存在时调用，返回属性/函数

    def __getattr__(self, path):

        # if attr == 'tn':

        #     return 'tttttt'

        return Test('%s/%s' % (self.__path, path))

    def get_path(self):

        return self.__path

    def __call__(self, *args, **kw):

        # for x in args:

        #     print(x)

        # for k,v in kw.items():

        #     print('%s = %s' % (k,v))

        print(args)

        print(kw)

        return '调用自己'

    # 修饰器

    @catch_exception

    def sum(self):

        return self.__a + self.__b

    def revive(self):

        print('revive from Exception')

if __name__ == '__main__':

    t = Test()

    for i in Test():

        print(i)

    print(t.sum(), t[10])

    print(t.api.football.csl.s2018.get_path())

    print(t(123, 'abc',no=1,name='bob'))