i have a custom report that i display the line.price.unit the decimal places was set as 4. 

but on the printout  i want to display only 2 decimal places so i did this 

'>>  t-esc="'%.2f'%(line.price_unit)"/

Now, i have a problem , if i have unit price is 3500.00 i want to display it with comma  to be like this 3,500.00