为什么python中的元素树在XML中添加了额外的新行和空格

Question

我怎样才能改变我的xml的外观

 <root>
     <elem1>
         <value>
            122
         </value>
         <text>
            This_is_just_a_text
         </text>
     </elem1>
     <elem1>
         <value>
            122
         </value>
         <text>
            This_is_just_a_text
         </text>
     </elem1>   
 </root>

看起来像:

 <root>
     <elem1>
         <value>122</value>
         <text>This_is_just_a_text</text>
     </elem1>
     <elem1>
         <value>122</value>
         <text>This_is_just_a_text</text>
     </elem1>   
 </root>

我只是想知道是什么原因发生的？顺便说一句,下面的方法/函数用于添加缩进!

 def prettify(elem):
     """
         Return a pretty-printed XML string for the Element.
     """
     rough_string = ET.tostring(elem, 'utf-8')
     reparsed = minidom.parseString(rough_string)
     return reparsed.toprettyxml(indent="\t")

Answer 1

Element将其包含的文本保存在常规文本中str,因此您可以调用str.strip()以消除不需要的空白.

import xml.etree.ElementTree as ET
import xml.dom.minidom as minidom

def prettify(elem):
     """
         Return a pretty-printed XML string for the Element.
     """
     rough_string = ET.tostring(elem, 'utf-8')
     reparsed = minidom.parseString(rough_string)
     return reparsed.toprettyxml(indent="\t")

def strip(elem):
    for elem in elem.iter():
        if(elem.text):
            elem.text = elem.text.strip()
        if(elem.tail):
            elem.tail = elem.tail.strip()

xml = ET.XML('''<elem1>
         <value>
            122
         </value>
         <text>
            This_is_just_a_text
         </text>
     </elem1>''')

strip(xml)
print prettify(xml)

结果:

<?xml version="1.0" ?>
<elem1>
    <value>122</value>
    <text>This_is_just_a_text</text>
</elem1>