title: Summing a column in a Python dataframe
body: <p>This table from Wikipedia shows the 10 biggest box office hits. I can't seem to get the total of the 'worldwide_gross' column. Can someone help? Thank you.</p>
  <pre><code>import pandas as pd
  boxoffice_df=pd.read_html('https://en.wikipedia.org/wiki/List_of_highest-grossing_films')
  films = boxoffice_df[1]
  
  films.rename(columns = {'Worldwide gross(2020 $)':'worldwide_gross'}, inplace = True)
  
  films.worldwide_gross.sum(axis=0)
  </code></pre>
  <p><a href="https://i.stack.imgur.com/n4yRt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/n4yRt.png" alt="enter image description here" /></a></p>
  <p>This is the output I get when I try calculating the total global earnings:
  <a href="https://i.stack.imgur.com/i4wSc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/i4wSc.png" alt="enter image description here" /></a></p>