dinero 0.1.2

Dinero is a library for working with monetary values in Python.

Dinero

A Dinero object is an immutable data structure representing a specific monetary value. It comes with methods for creating, parsing, manipulating, testing and formatting them.

Documentation (WIP)

Install

Dinero is a dependency free project.

pip install dinero

The problem

Using floats to do exact calculations in Python can be dangerous. When you try to find out how much 2.32 x 3 is, Python tells you it's 6.959999999999999. For some calculations, that’s fine. But if you are calculating a transaction involving money, that’s not what you want to see. Sure, you could round it off, but that's a little hacky.

>>> 2.32 * 3 == 6.96
False
>>> 2.32 * 3
6.959999999999999

You can read How to Count Money Exactly in Python to get a better idea.

Why Dinero?

Python Decimal instances are enough for basic cases but when you face more complex use-cases they often show limitations and are not so intuitive to work with. Dinero provides a cleaner and more easy to use API while still relying on the standard library. So it's still Decimal but easier.

>>> from dinero import Dinero
>>> from dinero.currencies import USD
>>>
>>> Dinero(2.32, USD) * 3 == 6.96
True

Dinero give you access to more than 100 different currencies:

>>> from dinero import Dinero
>>> from dinero.currencies import USD, EUR, GBP, INR, CLP

>>> Dinero(2.32, EUR)
Dinero(amount=2.32, currency={'code': 'EUR', 'base': 10, 'exponent': 2, 'symbol': '€'})

>>> Dinero(2.32, EUR).format(symbol=True, currency=True)
'€2.32 EUR'

>>> Dinero(2.32, EUR).raw_amount
Decimal('2.32')

You can perform operations:

>>> total = Dinero(456.343567, USD) + 345.32 *  3
>>> print(total)
# 1,492.30

>>> product = Dinero(345.32, USD).multiply(3)
>>> total = product.add(456.343567)
>>> print(total)
# 1,492.30

And comparisons:

>>> Dinero(100, EUR) == Dinero(100, EUR)
True
>>> Dinero(100, EUR) < Dinero(100, EUR)
False
>>> Dinero(100, EUR) <= Dinero(100, EUR)
True
>>> Dinero(100, EUR) > Dinero(100, EUR)
False
>>> Dinero(100, EUR) >= Dinero(100, EUR)
True