How to get only up to 2 float precision values of elements in a list

Question

How to get only up to 2 float precision values of elements in a list without changing the Float type of the elements.

l = [[u'NY Disability Contribution', 2.6, 2.6, 2.6, 1.3, 0.0, 0.0, 
    0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 9.1],[u'Income Tax',387.32,387.32,387.32,193.66,0.0,0.0, 0.0, 0.0, 
    0.0, 0.0, 0.0, 0.0, 1355.62]]

Output should be like

result = [[u'NY Disability Contribution', 2.60, 2.60, 2.60, 1.30, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 0.00, 9.10],[u'Income Tax',387.32,387.32,387.32,193.66,0.00,0.00, 0.00, 0.00, 
0.00, 0.00, 0.00, 0.00, 1355.62]]

Eg: for 2.6 ---> 2.60

I've tried like this

result = [[i[0]] + [float(format(j,".2f")) for j in i[1:]] for i in y]

but those are coming as string values

my output

   [[u'Contribution', '2.60', '2.60', '2.60', '1.30', '0.00', '0.00', 
   0.00', '0.00', '0.00', '0.00', '0.00', '0.00', '9.10'],
   [u'Tax','387.32','387.32','387.32','193.66','0.00','0.00', 
   '0.00','0.00', '0.00', '0.00', '0.00', '0.00', '1355.62']]

Thanks in advance

inherit from list and rewrite the repr method. but that's tricky... — Jean-François Fabre, Nov 01 '17 at 10:34
Numbers have their own internal representation. It does not matter the representation as a number as you are seeing it. If you want some special representation, they must be seen as strings. — fernand0, Nov 01 '17 at 10:34

score 0 · Accepted Answer · answered Nov 01 '17 at 11:17

If you absolutely want to display print(my_list) with a 2 float precision, you cannot unless:

you inherit from float (or list) and change the __repr__ method
you convert elements to string as you did
you avoid using print(my_list) and use a custom function to display your result

Using the answer provided in Easy pretty printing of floats in python?, here is a possibility:

class prettyfloat(float):
    def __repr__(self):
        return "%0.2f" % self

result = [[i[0]] + [prettyfloat(j) for j in i[1:]] for i in y]

How to get only up to 2 float precision values of elements in a list

1 Answers1