Introduce AssetPair
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@ -124,7 +124,8 @@ class Asset:
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if isinstance(self, Commodity):
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return f'commodity:{self.alpha_vantage_id}'
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raise NotImplementedError('Unsupported asset type: ' + str(self))
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msg = f'Unsupported asset type: {repr(self)}'
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raise NotImplementedError(msg)
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@staticmethod
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def from_string_id(asset_id: str) -> 'Asset':
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@ -481,12 +482,15 @@ class AssetAmount:
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return self.amount < other.amount
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AssetPair = tuple[Asset, Asset]
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@dataclasses.dataclass(frozen=True, eq=True)
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class ExchangeRateSample(Asset):
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class ExchangeRateSample:
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"""Single exchange rate sample with a timestamp and various stats."""
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timestamp: datetime.date | datetime.datetime
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base_asset: Asset
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asset_pair: AssetPair
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_average: Decimal | None = None
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last: Decimal | None = None
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open: Decimal | None = None
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@ -509,6 +513,7 @@ class ExchangeRateSample(Asset):
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one = Decimal('1')
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return dataclasses.replace(
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self,
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asset_pair=(self.asset_pair[1], self.asset_pair[0]),
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_average=one / self._average if self._average else None,
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last=one / self.last if self.last else None,
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open=one / self.open if self.open else None,
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