round off float to nearest 0.5 in python [duplicate]

Answer 1

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

def round_of_rating(number):
    """Round a number to the closest half integer.
    >>> round_of_rating(1.3)
    1.5
    >>> round_of_rating(2.6)
    2.5
    >>> round_of_rating(3.0)
    3.0
    >>> round_of_rating(4.1)
    4.0"""

    return round(number * 2) / 2

Edit: Added a doctestable docstring:

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