from sgmllib import SGMLParser, SGMLParseError ModuleNotFoundError: No module named 'sgmllib'

The `sgmllib` module has been deprecated since Python 2.6 and removed in Python 3.x. Instead, you can use the `html.parser` module, which provides similar functionality. Here's an example of how to use `html.parser` to parse an HTML document: ```python from html.parser import HTMLParser class MyHTMLParser(HTMLParser): def handle_starttag(self, tag, attrs): print("Start tag:", tag) for attr in attrs: print(" attr:", attr) def handle_endtag(self, tag): print("End tag :", tag) def handle_data(self, data): print("Data :", data) parser = MyHTMLParser() parser.feed('<html><head><title>Test</title></head><body><h1>Header</h1><p>Paragraph</p></body></html>') ``` This will output: ``` Start tag: html Start tag: head Start tag: title Data : Test End tag : title End tag : head Start tag: body Start tag: h1 Data : Header End tag : h1 Start tag: p Data : Paragraph End tag : p End tag : body End tag : html ```

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