XML Creation in Python: A Comprehensive Guide to Libraries and Methods

When creating XML documents in Python, developers have various library options at their disposal. The most popular and straightforward choice is the ElementTree API, an integral part of the Python standard library since version 2.5.

ElementTree: An Efficient Option

ElementTree provides two implementations: the basic pure-Python ElementTree and the optimized C implementation cElementTree. The latter has been deprecated in Python 3.3, with its functionality seamlessly merged into ElementTree.

Example Usage of ElementTree

Below is an illustration of how to create the provided XML document using cElementTree:

import xml.etree.cElementTree as ET

root = ET.Element("root")
doc = ET.SubElement(root, "doc")

field1 = ET.SubElement(doc, "field1", name="blah")
field1.text = "some value1"
field2 = ET.SubElement(doc, "field2", name="asdfasd")
field2.text = "some vlaue2"

tree = ET.ElementTree(root)
tree.write("filename.xml")

Other Library Options

Besides ElementTree, there are additional XML libraries available in Python:

• LXML: Based on libxml2, LXML offers an extensive superset of the ElementTree API, including XPath and CSS Selectors.
• xml.dom.minidom: The Python standard library also provides xml.dom.minidom, a DOM-based XML library.

Selection Considerations

For most practical purposes, cElementTree or LXML provide sufficient speed and functionality. However, if optimizing performance is paramount, benchmarks suggest that LXML excels in XML serialization, while cElementTree is faster for parsing due to its optimized parent traversal implementation.

Additional Resources

• [ElementTree API documentation](https://docs.python.org/3/library/xml.etree.elementtree.html)
• [Element Tree Tutorial (original author's site)](http://effbot.org/zone/element-tree.htm)
• [LXML etree tutorial](https://lxml.de/tutorial.html)