Simple way to round floats when printing

Question

I am working on a project where it has to take user inputs and do calculations.

What I am aiming for is the print to appear as

Inform the customer they saved 0.71 today

Not

Inform the customer they saved 0.7105000000000001 today

Is there something I can put into the same line of code with the print function to have it be rounded? Or do I have to modify each variable.

I can post my code if requested.

check [this post](http://stackoverflow.com/questions/4518641/how-to-round-off-a-floating-number-in-python). — Anthony Dito, Apr 23 '15 at 05:02

James Mills · Answer 1 · 2015-04-23T05:50:10.227

3

You can use the builtin round() function and float formatting:

>>> print "{0:0.2f}".format(round(x, 2))
0.71

Some Notes:

{0.2f} will format a float to 2 decimal places.
round(x, 2) will round up to 2 decimal places.

Side Note: round() is really necessary IHMO if you want to "round" the number before "display". It really depends on what you're doing!

edited Apr 23 '15 at 05:50

answered Apr 23 '15 at 05:03

James Mills

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2

`round` is unnecessary – wim Apr 23 '15 at 05:05
Depends if you want to round up as well as format the float :) – James Mills Apr 23 '15 at 05:07
I will try to use this in my code. Can someone explain to me exactly what .2f means? I just want to understand my own code – John V Apr 23 '15 at 05:07
@JohnV it's explained in the string formatting mini language here https://docs.python.org/2/library/string.html#formatspec – wim Apr 23 '15 at 05:15

Haresh Shyara · Answer 2 · 2015-04-23T05:13:39.830

2

round() is return the floating point value number rounded to ndigits digits after the decimal point. which takes as first argument the number and the second argument is the precision

no = 0.7105000000000001
print round(no, 2)

second solution:

print "%.2f" % 0.7105000000000001

edited Apr 23 '15 at 05:13

answered Apr 23 '15 at 05:08

Haresh Shyara

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score 0 · Answer 3 · answered Dec 07 '16 at 20:37

0

use decimal instead of round()

from decimal import *

print(round(8.494,2)) # 8.49
print(round(8.495,2)) # 8.49
print(round(8.496,2)) # 8.5


print(Decimal('8.494').quantize(Decimal('.01'), rounding=ROUND_HALF_UP)) #8.49
print(Decimal('8.495').quantize(Decimal('.01'), rounding=ROUND_HALF_UP)) #8.50
print(Decimal('8.496').quantize(Decimal('.01'), rounding=ROUND_HALF_UP)) #8.50

answered Dec 07 '16 at 20:37

Johnyz

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Why is `decimal` better than `round` in this case? – S.V Mar 31 '21 at 23:33

Simple way to round floats when printing

3 Answers3