lxml.etree

http://www.cnblogs.com/bluescorpio/archive/2013/06/09/3127964.html

http://blog.csdn.net/u012063703/article/details/51754665

http://www.jianshu.com/p/f446663c970f

1. 判断是否有子元素或子节点

使用len(element)，这更清楚，也不容易犯错。

 
  >>>  
  print 
  (etree.iselement(root))   
  # test if it's some kind of Element 
 
 
  True 
 
 
  >>>  
  if 
  len 
  (root):                  
  # test if it has children 
 
 
  ...      
  print 
  ( 
  "The root element has children" 
  ) 
 
 
  The root element has children 
 

    2. How to get childcode 
 

   element.getchildren() 
 

   3  Create xml with encoding="utf-8" 
 

   print et.tostring(tree, xml_declaration=True, encoding="utf-8") 
 

     
 

   例子: 
 
#!/usr/bin/env python
 
import os
import sys
import re

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from lxml import etree
 
 
 
tree1 = etree.parse(r'default.xml')
root1 = tree1.getroot()
 
root = etree.Element('manifest')
 
#for child in root1.iter('project'):
for child in root1:
  if not isinstance(child, etree._Comment):
    if len(child):
      child_node = etree.SubElement(root, child.tag, child.attrib)
      for node in child.getchildren():
        etree.SubElement(child_node, node.tag, node.attrib)
        print node.tag, node.attrib
    else:
      etree.SubElement(root, child.tag, child.attrib)
  else:
    root.append(etree.Comment(child.text))
 
tree = etree.ElementTree(root)
tree.write('mytest.xml', pretty_print=True, xml_declaration=True, encoding="utf-8", method='xml')
 
"""
remote = etree.Element('remote', fetch="..", name="MTK", review="10.75.10.90:8080")
default = etree.Element('default', {'remote': "MTK", 'revision': "E1/MTK/MT6737M/8.0/dev", 'sync-c': 'true', 'sync-j': '4'})
#root.append(remote)
#root.append(default)
root.extend([remote, default])
"""
 
"""
etree.SubElement(root, 'remote', fetch="..", name="MTK", review="10.75.10.90:8080")
etree.SubElement(root, 'default', {'remote': "MTK", 'revision': "E1/MTK/MT6737M/8.0/dev", 'sync-c': 'true', 'sync-j': '4'})
etree.SubElement(root, 'project', groups="device,fugu,broadcom_pdk,pdk", name="MTK/device/asus/fugu", path="LINUX/android/device/asus/fugu", revision="22d134832ae86e1df7f2ceee7ce0fbb56155050f", upstream="MTK/MT6737M/8.0/PRS.2017.06.10.10.00")
 
 
xml_data = etree.tostring(root, pretty_print=True, xml_declaration=True, encoding="utf-8")
print xml_data
print 'write xml...'
tree = etree.ElementTree(root)
tree.write('mytest.xml', pretty_print=True, xml_declaration=True, encoding="utf-8")
#with open('your.xml', 'w') as f:
#  f.write(xml_data)
 """ 
 

     
 

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