XML and JSON in Python
NPFL092 Technology for Natural Language Processing
XML and JSON in Python
Zden¨§k ?abokrtsk?, Rudolf Rosa
December 1, 2020
Charles University
Faculty of Mathematics and Physics
Institute of Formal and Applied Linguistics
unless otherwise stated
XML in Python
? the two standard approaches for XML processing are supported in the standard library:
? xml.dom.* ¨C a standard DOM API (Document Object Model)
? xml.sax.* ¨C a standard SAX API (Simple Api for Xml)
? but there¡¯s xml.etree.ElementTree (ET for short)
? a lightweight Pythonic API
? supports both DOM-like (but ET faster than DOM) and SAX-like processing (i.e.
event-based, streaming i.e. all-in-memory)
? fast C implementation used by default whenever possible in Python3 (no need for
xml.etree.cElementTree as in Python 2)
Credit: The following slides are based on an ElementTree intro by Eli Bendersky.
1/ 20
An XML file as a tree
credit:
2/ 20
ET: loading an XML doc
loading from a file:
import xml.etree.ElementTree as ET
tree = ET.ElementTree(file='sample.xml')
or from a string:
root = ET.fromstring('')
3/ 20
ET: traversing the tree
root = tree.getroot()
for child in root:
print(child.tag, child.attrib, child.text)
for descendant in root.iter():
....
4/ 20
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