Python 2 round() vs. Python 3 round()

python2_round

>>> round(0.5)
1.0
>>> round(2.5)
3.0
>>> round(0.4)
0.0
>>> round(2.6)
3.0

python3_round

>>> round(0.5)
0
>>> round(2.5)
2
>>> round(0.4)
0
>>> round(2.6)
3

From Python 3 docs:

For the built-in types supporting round(), values are rounded to the closest multiple of 10 to
the power minus ndigits; if two multiples are equally close, rounding is done toward the even
choice (so, for example, both round(0.5) and round(-0.5) are 0, and round(1.5) is 2). The
return value is an integer if called with one argument, otherwise of the same type as
number.

https://docs.python.org/3/library/functions.html#round