rounding up with python

问题

I've read the following pages:

python decimals - rounding to nearest whole dollar (no cents) - with ROUND_HALF_UP

http://docs.python.org/library/decimal.html

I have the following code:

total_num = Decimal(str(total/10))
total_num.quantize(Decimal('1'), rounding=ROUND_UP)

But its always rounding down? So if I have 221, I want it to return 23. Right now I'm getting 22. Is there something I'm misunderstanding regarding this?

[EDIT]

I changed it to the following: total_num = int(math.ceil(float(total)/10))

I needed an int to continue with the for loop that has a range.

回答1:

Can't you use math.ceil? It will do the necessary thing if you are using a float division. Currently you are doing an integer division.

回答2:

total is an integer. As such, / is doing integer division. Either divide by 10. (and hope that precision limits don't bite you in the ***), or do your math in Decimal with an appropriate context.

来源：https://stackoverflow.com/questions/11642387/rounding-up-with-python