<p onclick="window.location.href = 'https://www.blahblah.com/somenumbers'">
some blah blah text
</p>

<p> irrelevant text </p>

>>> from bs4 import BeautifulSoup
>>> import re
>>>
>>> soup = BeautifulSoup('<p> blabla</p> and <p onclick="js action">blabla</p>')
>>> soup.find_all('p', onclick=re.compile('.'))
[<p onclick="js action">blabla</p>]

plist = soup.select('p[onclick]')