Hi,

I noticed that my HW8 didn't pass a "pattern cross" secret test and checking my code I've realised that it is due to a strange way of approximating numbers used by Python.

This is what I would expect by the round function:

>>> round(1.5)

2

>>> round(2.5)

3

>>> round(3.5)

4

>>> round(4.5)

5

and so on.

This is on the contrary what Python does:

>>> round(1.5)

2

>>> round(2.5)

2

>>> round(3.5)

4

>>> round(4.5)

4

and so on.

Making some research I found out that this way of approximating numbers is called **convergent rounding**, **statistician's rounding**, **Dutch rounding**, **Gaussian rounding**, **oddâ€“even rounding**, or **bankers' rounding. **

I wanted to share this with you so that you'll not be fooled like I was. At least I learned something new!