#encoding=utf-8
from xml.etree import ElementTree as ET
import sys
root=ET.Element('color')  #用Element类构建标签
root.text=('black')     #设置元素内容
tree=ET.ElementTree(root)  #创建数对象，参数为根节点对象
tree.write(sys.stdout)   #输出在标准输出中，也可写在文件中

<color>black</color>

#encoding=utf-8
from xml.etree import ElementTree as ET
import sys
root=ET.Element('goods')
name_con=['yhb','lwy']
size_con=['175','170']
for i in range(2):
#  skirt=ET.SubElement(root,'skirt')
#  skirt.attrib['index']=('%s' %i)  #具有属性的元素
  skirt=ET.SubElement(root,'skirt',index=('%s' %i)) #相当于上面两句
  name=ET.SubElement(skirt,'name') #子元素
  name.text=name_con[i]       #节点内容
  size=ET.SubElement(skirt,'size')
  size.text=size_con[i]
  tree=ET.ElementTree(root)
ET.dump(tree)  #打印树结构

<goods><skirt index="0"><name>yhb</name><size>175</size></skirt><skirt index="1"><name>lwy</name><size>170</size></skirt></goods>