Decimals to 2 places for money in Python 3

Question

How do I get my decimals to stay at 2 places for representing money using the decimal module?

I\'ve setting the precision, and damn near everything else

Answer 1

Falsehoods programmers believe about money:

• Monetary values can be stored or represented as a floating point.
• All currencies have a decimal precision of 2.
• All ISO 4217 defined currencies have a decimal precision.
• All currencies are defined in ISO 4217.
• Gold is not a currency.
• My system will never have to handle obscure currencies with more than 2 decimal places.
• Floating point values are OK if the monetary value of transactions is "small".
• A system will always handle the same currency (therefore we do not persist the currency, only the monetary value).
• Storing monetary values as signed long integers will make them easier to work with, just multiply them by 100 after all arithmetic is done.
• Customers will never complain about my rounding methods.
• When I convert my application from language X to language Y, I don't have to verify if the rounding behavior is the same.
• On exchanging currency A for currency B, the exchange rate becomes irrelevant after the transaction.