How to round Python Decimal instance

Question

How do I round a Python Decimal instance to a specific number of digits while rounding to the nearest decimal?

I\'ve tried using the .quantize(Decimal(\'.01\')

Answer 1

I think you need to use the decimal.ROUND_HALF_UP option to quantize to get what you want.

>>> for x in ('3.605', '29342398479823.605', '3.604', '3.606'):
    print x, repr(Decimal(x).quantize(Decimal('.01'), decimal.ROUND_HALF_UP))

3.605 Decimal('3.61')
29342398479823.605 Decimal('29342398479823.61')
3.604 Decimal('3.60')
3.606 Decimal('3.61')