from bs4 import BeautifulSoup as _soup
html="<table><tr><td>a</td><td>b</td></tr><tr><td>a1</td><td>b2</td></tr><tr><td>a3</td><td>b3</td></tr></table>"
bs = _soup(html, "html.parser")
print([ td.text for td in bs.select("tr > td:nth-of-type(1)") ])
#['a', 'a1', 'a3']
>>841