Hi Mark,

Thank you for your reply.

I went over again the answer from Zachary Ware published on 2015-08-08 09:36. I got the point that it is better to use string type of number.

>>> from decimal import Decimal, ROUND_HALF_UP
>>> Decimal("1.45")
Decimal('1.45')

>>> Decimal(Decimal("1.45").quantize(Decimal("0.1"), rounding=ROUND_HALF_UP))
Decimal('1.5')

I think it is better to make a tip in the Python tutorial.