def __rsub__(self, other: Union['Price', float, int]):
"""Subtracts two PriceType objects together.
Arguments:
other: Union[Price, float, int]
The object that is the left argument of the
operation.
Raises:
IncompatibleTradingPairException:
If (other : Price) and the pairs do not equal each other.
InvalidNonNumericQuantity:
If not (other : Union[Price, Number]).
"""
price = None
if isinstance(other, Price):
rate = other.rate - self.rate
pair = self.pair or other.pair
if self.pair != other.pair:
raise IncompatibleTradingPairOperation(self.pair, other.pair)
price = Price(rate, pair)
elif isinstance(other, float) or isinstance(other, int):
price = Price(other - self.rate, self.pair)
elif not isinstance(other, Number):
raise InvalidNonNumericQuantity(other)
return price
def __iadd__(self, other: Union['Price', float, int]):
"""Iteratively add to a Price object.
Arguments:
other: Union[Price, float, int]
The object that is the left argument of the
operation.
Raises:
IncompatibleTradingPairException:
If (other : Price) and the pairs do not equal each other.
InvalidNonNumericQuantity:
If not (other : Union[Price, Number]).
"""
if isinstance(other, Price):
if self.pair != other.pair:
raise IncompatibleTradingPairOperation(self.pair, other.pair)
self.rate += other.rate
elif isinstance(other, float) or isinstance(other, int):
self.rate += other
elif not isinstance(other, Number):
raise InvalidNonNumericQuantity(other)
return self
def __truediv__(self, other: Union['Price', float, int]):
"""Divides two PriceType objects together.
Arguments:
other: Union[Price, float, int]
The object that is the left argument of the
addition operation.
Raises:
IncompatibleTradingPairException:
If (other : Price) and the pairs do not equal each other.
InvalidNonNumericQuantity:
If not (other : Union[Price, Number]).
"""
price = None
if isinstance(other, Price):
if self.pair.base == other.pair.base and self.pair.quote != other.pair.quote:
return Price(self.rate / other.rate,
other.pair.quote / self.pair.quote)
elif self.pair.base != other.pair.base and self.pair.quote == other.pair.quote:
return Price(self.rate / other.rate,
self.pair.base / other.pair.base)
elif self.pair.base != other.pair.base and self.pair.quote != other.pair.quote:
raise IncompatibleTradingPairOperation(self.pair, other.pair)
return self.rate / other.rate
elif isinstance(other, float) or isinstance(other, int):
price = Price(self.rate / other, self.pair)
elif isinstance(other, Quantity):
raise IncompatiblePriceQuantityOperation(self, other)
elif not isinstance(other, Number):
raise InvalidNonNumericQuantity(other)
return price
def __mul__(self, other: Union['Price', 'Quantity', float, int]):
"""Multiplies two PriceType objects together.
Arguments:
other: Union[Price, float, int]
The object that is the right argument of the
operation.
Raises:
IncompatibleTradingPairException:
If (other : Price) and the pairs do not equal each other.
InvalidNonNumericQuantity:
If not (other : Union[Price, Number]).
"""
price = None
if isinstance(other, Price):
rate = self.rate * other.rate
pair = self.pair or other.pair
if self.pair != other.pair:
raise IncompatibleTradingPairOperation(self.pair, other.pair)
price = Price(rate, pair)
elif isinstance(other, float) or isinstance(other, int):
price = Price(self.rate * other, self.pair)
elif isinstance(other, Quantity):
if other.instrument != self.pair.quote:
raise IncompatiblePriceQuantityOperation(
self.pair.quote, other.instrument)
return Quantity(self.pair.base, self.rate * other.size,
other.path_id)
elif not isinstance(other, Number):
raise InvalidNonNumericQuantity(other)
return price
def __rmul__(self, other):
if not isinstance(other, Number):
raise IncompatibleTradingPairOperation(other, self)
return Price(other, self)