title: Ask Pandas to delete all rows beneath a certain row
body: <p>I have imported an Excel file as a dataframe using pandas.</p>
  <p>I now need to delete all rows from row 41,504 (index 41,505) and below.</p>
  <p>I have tried <code>df.drop(df.index[41504])</code>, although that only catches the one row. How do I tell Pandas to delete onwards from that row?</p>
  <p>I did not want to delete by an index range as the dataset has tens of thousands of rows, and I would prefer not to scroll through the whole thing.</p>
  <p>Thank you for your help.</p>
  <p>Kind regards</p>