Formatting thousand separator for integers in a pandas dataframe

Question

I\'m trying to use \'{:,}\'.format(number) like the example below to format a number in a pandas dataframe:

# This works for floats and integers
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Answer 1

The formatters parameter in to_html will take a dictionary of column names mapped to a formatting function. Below has an example of a function to build a dict that maps the same function to both floats and ints.

In [250]: num_format = lambda x: '{:,}'.format(x)

In [246]: def build_formatters(df, format):
     ...:     return {column:format 
     ...:               for (column, dtype) in df.dtypes.iteritems()
     ...:               if dtype in [np.dtype('int64'), np.dtype('float64')]}
     ...: 

In [247]: formatters = build_formatters(df_int, num_format)


In [249]: print df_int.to_html(formatters=formatters)

  

    

      

      
A
    
  
  

    

      
0
      
20,000
    
    

      
1
      
10,000