$ pip freeze | grep beautifulsoup4 beautifulsoup4==4.6.3 $ python Python 3.7.0 (default, Jul 23 2018, 20:24:19) [Clang 9.0.0 (clang-900.0.39.2)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from bs4 import BeautifulSoup >>> text = "<![hi world]>" >>> BeautifulSoup(text, 'html.parser') /Users/conradroche/solvvy/ml-pipeline/venv/lib/python3.7/site-packages/bs4/builder/_htmlparser.py:78: UserWarning: unknown status keyword 'hi ' in marked section warnings.warn(msg) Traceback (most recent call last): File "<stdin>", line 1, in <module> File "/Users/conradroche/solvvy/ml-pipeline/venv/lib/python3.7/site-packages/bs4/__init__.py", line 282, in __init__ self._feed() File "/Users/conradroche/solvvy/ml-pipeline/venv/lib/python3.7/site-packages/bs4/__init__.py", line 343, in _feed self.builder.feed(self.markup) File "/Users/conradroche/solvvy/ml-pipeline/venv/lib/python3.7/site-packages/bs4/builder/_htmlparser.py", line 247, in feed parser.feed(markup) File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/html/parser.py", line 111, in feed self.goahead(0) File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/html/parser.py", line 179, in goahead k = self.parse_html_declaration(i) File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/html/parser.py", line 264, in parse_html_declaration return self.parse_marked_section(i) File "/usr/local/Cellar/python/3.7.0/Frameworks/Python.framework/Versions/3.7/lib/python3.7/_markupbase.py", line 160, in parse_marked_section if not match: UnboundLocalError: local variable 'match' referenced before assignment >>>