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'))