python中lxml模块生成xml文件

用python自带的xml.etree.ElementTree模块和xml.dom.minidom模块生成xml文件标签的属性时，属性顺序会按照字典顺序重排，要想按照自己设定顺序来，可以使用lxml模块，lxml模块不是python自带的，需要自己安装，安装方法见上一篇博客。

lxml模块用法的例子如下：

from lxml import etree

if __name__ == '__main__':
#root = etree.Element("root")

    root = etree.Element("root",nsmap={'xsi': 'http://b.c/d'})

    root.set("xsiinteresting", "totally")
    child1 = etree.SubElement(root, "child1" )
    child1.set("interesting", "totally")
    child1.text = "TEXT"

    child2 = etree.SubElement(root, "child2") 
    child2.set("name", "myattr1")
    child2.set("auto", "myattr2")

    child3 = etree.SubElement(child2, "child3")
    child3.text = "TEXT"
    child4 = etree.SubElement(child2, "child4")
    child4.text = "TEXT"
    child5 = etree.SubElement(child2, "child5")

    child6 = etree.SubElement(child5, "child6")
    child6.text = "TEXT"
    child7 = etree.SubElement(child5, "child7")
    child7.text = "TEXT"
#root.append( etree.Element("child1") )
#root.append( etree.Element("child1", interesting="totally"))
#child2 = etree.SubElement(root, "child2") 

#child3 = etree.SubElement(root, "child3")
#root.insert(0, etree.Element("child0")) 

    print etree.tostring(root, pretty_print=True) 

# write to file: 
    tree = etree.ElementTree(root)  
    tree.write('text.xml', pretty_print=True, xml_declaration=True, encoding='utf-8')