Basic

>>> from pricing import Price
... Price('2.22', 'USD')
EUR 2.22

>>> Price('2.34223434', 'BTC')
BTC 2.34223434

>>> m = Price(2, 'USD')
... m.amount
Decimal('2')
... m.currency
'USD'

>>> m = Price('2.22', 'EUR')
... m / 2
EUR 1.11
>>> m + Price('7.77', 'EUR')
EUR 9.99

Formatting

>>> m = Price('1234.567', 'EUR')
... str(m)
'EUR 1,234.57'

>>> m.format()
'€1,234.57'

Payment URI’s

Create BIP21 and EIP681 compatible payment URI’s.

>>> from pricing.uris import BIP21PaymentURI
... BIP21PaymentURI(
... 'bitcoin',
... address='19kxPokCjD6tUU3sHaLZgEQBkRsCTBt3jj',
... amount='4.32345').to_uri()
'bitcoin:19kxPokCjD6tUU3sHaLZgEQBkRsCTBt3jj?amount=4.32345'

>>> from pricing.uris import EIP681PaymentURI
... EIP681PaymentURI(
... 'ethereum',
... address='077a7506b69e37e4f6852577190f04a35df9a36c',
... value='4.32345').to_uri()
'ethereum:0x077a7506b69e37e4f6852577190f04a35df9a36c?value=4.32345'

Currency Exchange

Currency exchange works by “installing” a backend class that implements the IExchangeBackend interface.

XPrice

You can use money.XPrice (a subclass of Price), for automatic currency conversion while adding, subtracting, and dividing money objects (+, +=, -, -=, /, //). This is useful when aggregating lots of money objects with heterogeneous currencies. The currency of the leftmost object has priority.

from pricing import XPrice

# Register backend and rates as above...
a = XPrice(1, 'AAA')
b = XPrice(1, 'BBB')

assert sum([a, b]) == XPrice('1.25', 'AAA')

Extending and customization

You can use ZCML to configure custom currencyFormats and exchanges, create a new file called currency.zcml, and follow the example below to configure.

<configure
    xmlns:zope="http://namespaces.zope.org/zope"
    xmlns="http://namespaces.zope.org/currency">

    <zope:include package="pricing" file="currency-meta.zcml" />

    <currency default="USD">
        <currencyFormat
            name="bitcoin"
            code="BTC"
            symbol="₿"
            format="¤#,##0.########"
            currency_digits="false"
            decimal_quantization="true" />
        <currencyFormat
            name="litecoin"
            code="LTC"
            symbol="Ł"
            format="¤#,##0.########"
            currency_digits="false"
            decimal_quantization="true" />
        <currencyFormat
            name="ether"
            code="ETH"
            symbol="Ξ"
            format="¤#,##0.##################"
            currency_digits="false"
            decimal_quantization="true" />

        <exchange
            component="pricing.exchange.Exchange"
            backend="pricing.exchange.CoinBaseBackend"
            base="USD" />
    </currency>

</configure>

Then include currency.zcml in your configure.zcml file:

<include file="currency.zcml" />

Fields

Included are custom fields for zope.schema and attrs based classes. Checkout money.fields.

Hierarchy

• PriceException

  • CurrencyMismatch

  • InvalidOperandType

  • ExchangeError

    • ExchangeBackendNotInstalled

    • ExchangeRateNotFound