How to introduce new subelement node in an xml file using python

Question

I am new to Python programming . I have a xml file in which one snippet is as below .

<relationship name="a_to_b">
  <containment>
    <parent>
      <hasClass name="a" />
    </parent>
    <child>
      <hasClass name="b" />
    </child>
  </containment>
</relationship>

Now I have to update this section with the below content .

<relationship name="a_to_b">
  <containment>
    <parent>
      <hasClass name="a">
         <mimName>top</mimName>
       </hasClass>
    </parent>
    <child>
      <hasClass name="b">
        <mimName>top</mimName>
      </hasClass>
    </child>
  </containment>
</relationship>

I am using ElmentTree module . How can I achieve this . Python version 2.6 .

I am using below code .

tree = ET.ElementTree(file=xml) ;
root=tree.getroot() ;
print("Root tag of xml : "+root.tag) ;
#child_of_root=root;
#print("Root tag attribute of xml : "+root.attrib) ;



def fun(root):
   #if root.tag is not 'relationship':
      for child_of_root in root :
          #print("Tag : "+child_of_root.tag) ;
          attribut=child_of_root.attrib ;
          #print "Value : %s" %  attribut.get('name')
          if (child_of_root.tag == 'hasClass' and attribut.get('name') == 'MeContext') or (child_of_root.tag == 'hasClass' and attribut.get('name') == 'ManagedElement') :
           print(child_of_root.tag,attribut.get('name')) ;
           new_data = ET.SubElement(child_of_root, 'mimName');
           new_data.text = 'Top' 
       fun(child_of_root) 

fun(root);

Answer 1

Use xml.etree.ElementTree.SubElement to add tags within another tag. Copying from Python.org ->

>>> a = ET.Element('a')
>>> b = ET.SubElement(a, 'b')
>>> c = ET.SubElement(a, 'c')
>>> d = ET.SubElement(c, 'd')
>>> ET.dump(a)
<a><b /><c><d /></c></a>