Serialize a Python dictionary to XML. Useful when working with both JSON and XML files. Doesn't work with object, lists, tuples or generators.

dict_to_xml.py

# -*- coding: Utf-8 -*-

import xml.etree.ElementTree as ET

def create_xml_tree(root, dict_tree):
    # Node : recursively create tree nodes
    if type(dict_tree) == dict:
        for k, v in dict_tree.iteritems():
            create_xml_tree(ET.SubElement(root, k), v)
        return root
    # Leaf : just set the value of the current node
    else:
        root.text = str(dict_tree)

#
# TEST EXAMPLE
#

def prettify(elem):
    """Return a pretty-printed XML string for the Element.
    Source : http://stackoverflow.com/questions/17402323/use-xml-etree-elementtree-to-write-out-nicely-formatted-xml-files
    """
    from xml.dom import minidom
    rough_string = ET.tostring(elem, 'utf-8')
    reparsed = minidom.parseString(rough_string)
    return reparsed.toprettyxml(indent="".join([' '] * 4))

test = {
    "Library" : {
        "Book1": {
            "Author": "Foo",
            "Title": "How to foo",
            "Year": 2014
        },
        "Book2": {
            "Author": "Bar",
            "Title": "How to bar",
            "Year": 2012
        }
    }
}

tree_root = create_xml_tree(ET.Element("root"), test)

# Not prettified
ET.ElementTree(tree_root).write("test.xml")

# Prettified
with open('test.xml', 'w') as output:
    output.write(prettify(tree_root))