报价findall，
Element.findall() 仅查找带有标签的元素，这些标签是当前元素的直接子元素。
由于它只能找到直系孩子，因此我们需要递归地找到其他孩子，像这样
>>> import xml.etree.ElementTree as ET
>>>
>>> def find_rec(node, element, result):
... for item in node.findall(element):
... result.append(item)
... find_rec(item, element, result)
... return result
...
>>> find_rec(ET.parse("h.xml"), 'saybye', [])
[<Element 'saybye' at 0x7f4fce206710>, <Element 'saybye' at 0x7f4fce206750>, <Element 'saybye' at 0x7f4fce2067d0>]
>>> def find_rec(node, element):
... for item in node.findall(element):
... yield item
... for child in find_rec(item, element):
... yield child
...
>>> list(find_rec(ET.parse("h.xml"), 'saybye'))
[<Element 'saybye' at 0x7f4fce206a50>, <Element 'saybye' at 0x7f4fce206ad0>, <Element 'saybye' at 0x7f4fce206b10>]
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