> At the end of year 15 total paid is $ 657,095.40 At the end of year 16 total paid is $ 700,901.76 > At the end of year 14 total paid is $ 613,289.04 > At the end of year 13 total paid is $ 569,482.68 > At the end of year 12 total paid is $ 525,676.32 > At the end of year 10 total paid is $ 438,063.60 At the end of year 11 total paid is $ 481,869.96 > At the end of year 9 total paid is $ 394,257.24 > At the end of year 8 total paid is $ 350,450.88 > At the end of year 7 total paid is $ 306,644.52 > At the end of year 5 total paid is $ 219,031.80 At the end of year 6 total paid is $ 262,838.16 > At the end of year 4 total paid is $ 175,225.44 > At the end of year 3 total paid is $ 131,419.08 > At the end of year 2 total paid is $ 87,612.72 $ ".format(total_paid)) > At the end of year 1 total paid is $ 43,806.36 If you're using this for currency, and also want the value to be seperated by ,'s you can use Also, if you keep your Decimals with two digits of precision beyond the decimal point (meaning as much precision as is necessary to keep all digits to the left of the decimal point and two to the right of it and no more.), then converting them to strings with str will work fine: str(Decimal('10')) If you need the answer to that (along with lots of other useful information), see the aforementioned section of the docs. Once I have valid two place inputs, how do I maintain that invariant throughout an application? > Decimal('3.214').quantize(TWOPLACES, context=Context(traps=)) > Decimal('3.21').quantize(TWOPLACES, context=Context(traps=)) > # Validate that a number does not exceed two places If the Inexact trap is set, it is also useful for validation: > TWOPLACES = Decimal(10) ** -2 # same as Decimal('0.01') The quantize() method rounds to a fixed number of decimal places. Others are not supposed to have excess digits and need to be validated. In a fixed-point application with two decimal places, some inputs have many places and need to be rounded. If so, the Decimal FAQ section of the docs has a question/answer pair which may be useful for you: I suppose you're probably using the Decimal() objects from the decimal module? (If you need exactly two digits of precision beyond the decimal point with arbitrarily large numbers, you definitely should be, and that's what your question's title suggests.)
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