>> i want to trunkate 199.999 to 199.99
>> getcontext.prec = 2 isn't what i'm after either, all that does
>> is E's the value. do i really have to use floats to do this?
The precision is the total number of digits (i.e 199.99 has 5 digit
precision). Either round to that precision level or use the quantize
method to round to a fixed number of places after the decimal point:
>>> Context(prec=5, rounding=ROUND_DOWN).create_decimal('199.999')
Decimal("199.99")
>>> Decimal('199.999').quantize(Decimal('0.01'), rounding=ROUND_DOWN)
Decimal("199.99")
Raymond Hettinger
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