Importing bs4 in Python 3.5

Update: BeautifulSoup 4.4.0 has been updated to be python3.5 compatible, so a pip install --upgrade beautifulsoup4 should do the trick if you are still hitting this issue.

Update: Starting with 4.4.0, BeautifulSoup is compatible with Python 3.5. Upgrade:

pip install --upgrade beautifulsoup4

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Old answer:

Because of the changes made for Deprecate strict mode of HTMLParser issue:

Issue #15114: the strict mode and argument of HTMLParser, HTMLParser.error, and the HTMLParserError exception have been removed.

I'm afraid beautifulSoup4 is not compatible with Python 3.5 at the moment. Use Python 3.4.