<info> 
<person > 
<id>1</id> 
<name>fsy</name> 
<age >24</age> 
</person> 
<person> 
<id>2</id> 
<name>jianjian</name> 
<age>24</age> 
</person> 
<count id ='1'>1000</count> 
</info> 

def read_xml(file): 
# parse()函數(shù)會(huì)返回一個(gè)能代表整篇文檔的對(duì)象。這不是根元素。要獲得根元素的引用可以調(diào)用getroot()方法。 
tree = etree.parse(file) 
root = tree.getroot() 
return root 

def print_node(node): 
'''''打印結(jié)點(diǎn)基本信息''' 
print("node.tag:%s" % node.tag) 
print("node.attrib:%s"%node.attrib) 
print( "node.text:%s" % node.text) 

find_all 
>>> root = read_xml ('first.xml')   
>>> res = root.findall("person") 
[<Element 'person' at 0x00000000033388B8>, <Element 'person' at 0x0000000003413D68>] 
 
注意：findall只查詢直接的子節(jié)點(diǎn) 
>>> r1 = root.findall("id") 
>>> r1 
[] 
>>> r =tree.findall(".//id") 
>>> for e in r: 
  print( e,e.text) 
 
 
<Element 'id' at 0x00000000034279F8> 1 
<Element 'id' at 0x0000000003427B38> 2 

#find()方法用來返回第一個(gè)匹配到的元素。當(dāng)我們認(rèn)為只會(huì)有一個(gè)匹配，或者有多個(gè)匹配但我們只關(guān)心第一個(gè)的時(shí)候，這個(gè)方法是很有用的。 
>>> res[0].find("id") 
<Element 'id' at 0x0000000003413CC8> 
>>> print_node(res[0].find("id")) 
node.tag:id 
node.attrib:{} 
node.text:1 

>>> bk = res[0].find("no") 
>>> bk 
>>> type(bk) 
<class 'NoneType'> 
>>> res[0].find("id") 
<Element 'id' at 0x0000000003413CC8> 
>>> if res[0].find("id"): 
    print("find") 
  else: 
    print("not find") 
not find 
>>> if res[0].find("id") is not None: 
    print("find") 
  else: 
    print("not find") 
find