ikseek/iso_4217

Yet another currency data package for Python

iso_4217: Yet another currency data package for Python

This package contains ISO 4217 active and historical currency data. Supports pint for operations with currency units.

>>> from iso_4217 import Currency
>>> Currency.USD
<Currency.USD: 'US Dollar'>
>>> Currency.USD.value
'US Dollar'
>>> Currency.USD.number
840
>>> Currency('US Dollar')
<Currency.USD: 'US Dollar'>
>>> Currency.JPY.entities
frozenset({'JAPAN'})
>>> Currency.ZWR
<Currency.ZWR: 'Zimbabwe Dollar (2009)'>
>>> Currency.ZWR.entities
frozenset()
>>> Currency.ZWR.withdrew_entities
(Historic(entity='ZIMBABWE', name='Zimbabwe Dollar'...2009, month=6), begin=None)),)
>>> Currency.VED
<Currency.VED: 'Bolívar Soberano (VED)'>

Pint units and subunits are available with convenient unit and subunit properties on Currency. Accessing these properties requires pint package installed and automatically defines currency units in application default registry.

>>> Currency.USD.unit * 5 + Currency.USD.subunit * 5
<Quantity(5.05, 'USD')>

Currency units can be defined in any UnitRegistry manually

>>> import pint
>>> from decimal import Decimal
>>> from iso_4217 import define_currency_units
>>> reg = define_currency_units(pint.UnitRegistry(non_int_type=Decimal))
>>> 5 * reg.USD
<Quantity(5, 'USD')>

But units from separate registries should not be mixed

>>> Currency.USD.unit == reg.USD
Traceback (most recent call last):
...
ValueError: Cannot operate with Unit and Unit of different registries.

If you want to replace registry used by Currency just replace the application registry:

>>> pint.set_application_registry(reg)
>>> Currency.USD.unit == reg.USD
True

Subunits are defined with s suffix:

>>> 5 * reg.USDs
<Quantity(5, 'USDs')>
>>> (5 * reg.USDs).to("USD")
<Quantity(0.05, 'USD')>
>>> (5 * reg.BHDs).to_base_units()
<Quantity(0.005, 'BHD')>

Each currency is defined within it's own dimension:

>>> (5 * reg.USD).to('EUR')
Traceback (most recent call last):
...
pint.errors.DimensionalityError: Cannot convert from 'USD' ([currency_USD]) to 'EUR' ([currency_EUR])

But automatic currency conversion can be made via pint Contexts

>>> context = pint.Context()
>>> eur_to_usd = lambda r, eur: eur * r("1.2 USD/EUR")
>>> context.add_transformation("[currency_EUR]", "[currency_USD]", eur_to_usd)
>>> (Currency.EUR.unit * 5).to('USD', context)
<Quantity(6.0, 'USD')>

Inspired by iso4217 package by Hong Minhee.