Inconsistent table name

Hi All,

I am a python beginner learning web scrapping.

I try to collect data from table in wiki but fail:
table = soup.find_all(‘table’, class_=‘wikitable sortable jquery-tablesorter’)

However if I use
table = soup.find_all(‘table’, class_=‘wikitable sortable’) it success

I wonder why the table name is not the one show in screen. Many thank!

image