def __truediv__(self, other):
if isinstance(other, Rational):
return Rational(self._p * other._q, self._q * other._p)
elif isinstance(other, integer.Integer):
return Rational(self._p, self._q * other._value)
elif isinstance(other, real.Real):
return real.Real((self._p / self._q) / other._value)
elif isinstance(other, infinity.Infinity):
return integer.Integer(0)
raise AttributeError("Not a numerical term: " + str(other))
def __sub__(self, other):
if isinstance(other, Rational):
return Rational(self._p * other._q - other._p * self._q,
self._q * other._q)
elif isinstance(other, integer.Integer):
return Rational(self._p - self._q * other._value, self._q)
elif isinstance(other, real.Real):
return real.Real(self._p / self._q - other._value)
elif isinstance(other, infinity.Infinity):
return infinity.Infinity(not other._is_positive)
raise AttributeError("Not a numerical term: " + str(other))
def __add__(self, other):
if isinstance(other, Rational):
return Rational(self._p * other._q + other._p * self._q,
self._q * other._q)
elif isinstance(other, integer.Integer):
return Rational(self._p + self._q * other._value, self._q)
elif isinstance(other, real.Real):
return real.Real(self._p / self._q + other._value)
elif isinstance(other, infinity.Infinity):
return other
raise AttributeError("Not a numerical term: " + str(other))
def __add__(self, other):
if isinstance(other, Integer):
return Integer(self._value + other._value)
elif isinstance(other, rational.Rational):
return rational.Rational(self._value * other._q + other._p,
other._q)
elif isinstance(other, real.Real):
return real.Real(self._value + other._value)
elif isinstance(other, infinity.Infinity):
return other
raise AttributeError("Not a numerical term: " + str(other) +
" type: " + str(type(other)))
def __mul__(self, other):
if isinstance(other, Integer):
return Integer(self._value * other._value)
elif isinstance(other, rational.Rational):
return rational.Rational(self._value * other._p, other._q)
elif isinstance(other, real.Real):
return real.Real(self._value * other._value)
elif isinstance(other, infinity.Infinity):
if self._value == 0:
return self
else:
return infinity.Infinity(
other._is_positive == (self._value > 0))
raise AttributeError("Not a numerical term: " + str(other))
def __mul__(self, other):
if isinstance(other, Rational):
return Rational(self._p * other._p, self._q * other._q)
elif isinstance(other, integer.Integer):
return Rational(self._p * other._value, self._q)
elif isinstance(other, real.Real):
return real.Real(self._p / self._q * other._value)
elif isinstance(other, infinity.Infinity):
if self >= integer.Integer(0) \
and self < integer.Integer(1):
return integer.Integer(0)
else:
return infinity.Infinity(
other._is_positive == (self > integer.Integer(0)))
raise AttributeError("Not a numerical term: " + str(other))