round off float to nearest 0.5 in python [duplicate]

Question

I'm trying to round off floating digits to the nearest 0.5

For eg.

1.3 -> 1.5 2.6 -> 2.5 3.0 -> 3.0 4.1 -> 4.0 

This is what I'm doing

def round_of_rating(number):         return round((number * 2) / 2) 

This rounds of numbers to closest integer. What would be the correct way to do this?

Answer 1

Try to change the parenthesis position so that the rounding happens before the division by 2

def round_off_rating(number):     """Round a number to the closest half integer.     >>> round_off_rating(1.3)     1.5     >>> round_off_rating(2.6)     2.5     >>> round_off_rating(3.0)     3.0     >>> round_off_rating(4.1)     4.0"""      return round(number * 2) / 2 

Edit: Added a doctestable docstring:

>>> import doctest >>> doctest.testmod() TestResults(failed=0, attempted=4)