title: How to insert a comma as a thousands separator in a pandas dataframe column?
body: <p>I'm trying to format the Dollar Amount column to have a comma thousands separator for easier viewing, but I haven't been able to figure it out. Can someone please show me the way?</p>
  
  <pre><code>import pandas as pd
  df = pd.read_excel('filename.xlsx') 
  df['Dollar Amount'].head()
  
  Index  Dollar Amount
  0      5721.48
  1      4000.00
  2      4769.00
  3       824.07
  4       643.60
  5       620.00
  
  Name: Dollar Amount, dtype: float64
  </code></pre>