python-number-formatting-examples

round to 2 decimal places



In [1]:

    
'{:.2f}'.format(8.499)









    Out[1]:





'8.50'

format float as percentage



In [2]:

    
'{:.2f}%'.format(10.12345)









    Out[2]:





'10.12%'

truncate to at most 2 decimal places

turn it into a string then replace everything after the second digit after the point



In [3]:

    
import re

def truncate(num,decimal_places):  
    dp = str(decimal_places)
    return re.sub(r'^(\d+\.\d{,'+re.escape(dp)+r'})\d*$',r'\1',str(num))



In [4]:

    
truncate(8.499,decimal_places=2)









    Out[4]:





'8.49'



In [5]:

    
truncate(8.49,decimal_places=2)









    Out[5]:





'8.49'



In [6]:

    
truncate(8.4,decimal_places=2)









    Out[6]:





'8.4'



In [7]:

    
truncate(8,decimal_places=2)









    Out[7]:





'8'

left padding with zeros



In [8]:

    
# make the total string size AT LEAST 9 (including digits and points), fill with zeros to the left
'{:0>9}'.format(3.499)









    Out[8]:





'00003.499'



In [9]:

    
# make the total string size AT LEAST 2 (all included), fill with zeros to the left
'{:0>2}'.format(3)









    Out[9]:





'03'

right padding with zeros



In [10]:

    
# make the total string size AT LEAST 11 (including digits and points), fill with zeros to the RIGHT
'{:<011}'.format(3.499)









    Out[10]:





'3.499000000'

separators



In [11]:

    
"{:,}".format(100000)









    Out[11]:





'100,000'