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交作业&求教

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水滴竹沙

#1 Created at ... [Delete] [Delete and Lock User] 
在此插入代码
class Chain(object):
    def __init__(self, path=''):
        self._path = path
    def __getattr__(self, path):
        if path == 'users':
            return lambda x : Chain('%s/%s/:%s' % (self._path,path, x)) 
        return Chain('%s/%s' % (self._path, path))
    def __str__(self):
        return self._path
    __repr__ = __str__

运行结果：

Chain().users('michael').repos /users/:michael/repos

但是： 对于Chain().users.repos及Chain().users（）.repos并不能得到/users/repos，此时users已变成方法，要么提示是Function,要么提示缺少参数

问题，如何修改可以同时满足Chain().users('michael').repos，Chain().users.repos，Chain().users（）.repos

一霎那时间

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

可以在类中定义users方法，把参数输入给类。


class Chain(object):
     def __init__(self,path=''):
         self._path=path
     def __getattr__(self,path):
         return Chain('%s/%s' % (self._path,path))
     def __str__(self):
         return self._path
     __repr__=__str__
     def users(self,n):
         self._user=n
         return Chain('%s/%s' % (self._path,self._user))

早起的达先生

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

解决方法：给lambda的x设置默认的参数

class Chain(object):
    def __init__(self, path=''):
        self._path = path
    def __getattr__(self, path):
        if path == 'users':
            return lambda x='' : Chain('%s/%s/:%s' % (self._path,path, x)) 
        return Chain('%s/%s' % (self._path, path))
    def __str__(self):
        return self._path
    __repr__ = __str__
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