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__getattr__习题

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4Neutrino

#1 Created at ... [Delete] [Delete and Lock User] 
class Chain(object):

    def __init__(self, path=''):
        self._path = path

    def __getattr__(self, path):
        return Chain('%s/%s' % (self._path, path))

    def users(self, usr):
        return Chain('%s/users/%s' % (self._path, usr))

    def __str__(self):
        return self._path

    __repr__ = __str__

c = Chain().users('michael').repos
print(c)

4Neutrino

#2 Created at ... [Delete] [Delete and Lock User]

看了讨论，确实有BUG，修改如下：

class Chain(object):

    def __init__(self, path=''):
        self._path = path

    def __getattr__(self, path):
        return Chain('%s/%s' % (self._path, path))

    def __call__(self, arg):
        return self.__getattr__(arg)

    def __str__(self):
        return self._path

    __repr__ = __str__

print(Chain().users('michael').repos)
print(Chain().users('michael').users.repos)
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