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# Python: SAX parsing with xml.sax

import xml.sax
import xml.sax.handler

class BookHandler(xml.sax.ContentHandler):
    """Extract book records from the library XML."""

def __init__(self):
        super().__init__()
        self.books        = []
        self._current     = {}
        self._current_tag = None
        self._buffer      = []

def startElement(self, name, attrs):
        self._current_tag = name
        self._buffer      = []
        if name == 'book':
            # attrs is an AttributesImpl object
            self._current = {
                'id':       attrs.get('id', ''),
                'category': attrs.get('category', ''),
            }

def characters(self, content):
        # May be called multiple times for one text node
        self._buffer.append(content)

def endElement(self, name):
        text = ''.join(self._buffer).strip()
        if name in ('title', 'author', 'year', 'price'):
            self._current[name] = text
        elif name == 'book':
            self.books.append(dict(self._current))
            self._current = {}
        self._current_tag = None
        self._buffer      = []

def endDocument(self):
        print(f'Parsing complete. {len(self.books)} books found.')

import io

xml_bytes = b"""<?xml version="1.0" encoding="UTF-8"?>
<library>
    <book id="b001" category="fiction">
        <title>The Great Gatsby</title>
        <author>F. Scott Fitzgerald</author>
        <year>1925</year><price>12.99</price>
    </book>
    <book id="b002" category="non-fiction">
        <title>Clean Code</title>
        <author>Robert C. Martin</author>
        <year>2008</year><price>35.00</price>
    </book>
</library>"""

handler = BookHandler()
xml.sax.parseString(xml_bytes, handler)
for b in handler.books:
    print(b)