111 lines
2.6 KiB
Python
111 lines
2.6 KiB
Python
# -*- coding: utf-8 -*-
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babel = None
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try:
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import babel
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except ImportError:
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pass
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import six
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from sqlalchemy_utils import i18n, ImproperlyConfigured
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from sqlalchemy_utils.utils import str_coercible
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@str_coercible
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class Currency(object):
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"""
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Currency class wraps a 3-letter currency code. It provides various
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convenience properties and methods.
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::
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from babel import Locale
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from sqlalchemy_utils import Currency, i18n
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# First lets add a locale getter for testing purposes
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i18n.get_locale = lambda: Locale('en')
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Currency('USD').name # US Dollar
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Currency('USD').symbol # $
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Currency(Currency('USD')).code # 'USD'
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Currency always validates the given code.
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::
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Currency(None) # raises TypeError
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Currency('UnknownCode') # raises ValueError
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Currency supports equality operators.
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::
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Currency('USD') == Currency('USD')
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Currency('USD') != Currency('EUR')
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Currencies are hashable.
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::
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len(set([Currency('USD'), Currency('USD')])) # 1
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"""
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def __init__(self, code):
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if babel is None:
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raise ImproperlyConfigured(
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"'babel' package is required in order to use Currency class."
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)
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if isinstance(code, Currency):
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self.code = code
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elif isinstance(code, six.string_types):
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self.validate(code)
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self.code = code
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else:
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raise TypeError(
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'First argument given to Currency constructor should be '
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'either an instance of Currency or valid three letter '
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'currency code.'
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)
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@classmethod
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def validate(self, code):
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try:
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i18n.get_locale().currencies[code]
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except KeyError:
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raise ValueError("{0}' is not valid currency code.")
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@property
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def symbol(self):
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return babel.numbers.get_currency_symbol(self.code, i18n.get_locale())
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@property
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def name(self):
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return i18n.get_locale().currencies[self.code]
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def __eq__(self, other):
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if isinstance(other, Currency):
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return self.code == other.code
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elif isinstance(other, six.string_types):
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return self.code == other
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else:
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return NotImplemented
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def __ne__(self, other):
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return not (self == other)
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def __hash__(self):
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return hash(self.code)
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def __repr__(self):
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return '%s(%r)' % (self.__class__.__name__, self.code)
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def __unicode__(self):
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return self.code
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