如何一次性获取某个控件的所有属性？

**你遇到了什么我们这个库解决不了的问题？**
我想一次性获取控件的所有属性, 就像IDe里边的调试信息一样

**描述一下你想如何解决这个问题**
(如果你有想法的话，不要犹豫，请告诉我们。)
我在proxy.py 里面看到了这个函数, 但是一次只能获取一个属性, 怎样才能一次性获取所有的属性？?
```
@refresh_when(PocoTargetRemovedException)
def attr(self, name):
"""
Retrieve the attribute of UI element by given attribute name. Return None if attribute does not exist.
If attribute type is :obj:`str`, it is encoded to utf-8 as :obj:`str` in Python2.7.

Args:
name:
attribute name, it can be one of the following or any other customized type implemented by SDK

- visible: whether or not it is visible to user
- text: string value of the UI element
- type: the type name of UI element from remote runtime
- pos: the position of the UI element
- size: the percentage size [width, height] in range of 0~1 according to the screen
- name: the name of UI element
- ...: other sdk implemented attributes

Returns:
None if no such attribute or its value is None/null/nil/etc. Otherwise the attribute value is returned. The
returned value type is json serializable. In both py2 and py3, if the attribute value in remote is a
text-like object, the return value type will be :obj:`str`.

Raises:
PocoNoSuchNodeException: when the UI element does not exists

.. note:: Exception :py:class:`NodeHasBeenRemovedException` is caught automatically.

See Also:
:py:meth:`UI element attributes in poco sdk definition `.
"""

# to optimize performance speed, retrieve only the first matched element.
# 优化速度，只选择第一个匹配到的节点
nodes = self._do_query(multiple=False)
val = self.poco.agent.hierarchy.getAttr(nodes, name)
if six.PY2 and isinstance(val, six.text_type):
# 文本类型的属性值，只在python2里encode成utf-8的str，python3保持str类型
# 这是为了在写代码的时候，无论py2/3始终可以像下面这样写
# node.attr('text') == '节点属性值'
val = val.encode('utf-8')
return val
```

**额外信息**
无