Ahhh, fun with introspection

test.py

#!/usr/bin/env python3

class Foo:

	def __init__(self, lhs, op=None, rhs=None):
		self.lhs = lhs
		if op: self.op = op
		if rhs: self.rhs = rhs

	def __str__(self):
		try:
			return f"({self.lhs} {self.op} {self.rhs})"
		except AttributeError:
			return str(self.lhs)

	def __add__(self, other):
		return Foo(self, "__add__", other)

	def __sub__(self, other):
		return Foo(self, "__sub__", other)

	def __mul__(self, other):
		return Foo(self, "__mul__", other)

	def __truediv__(self, other):
		return Foo(self, "__truediv__", other)

	def eval(self):
		try:
			return getattr(self.lhs.eval(), self.op)(self.rhs.eval())
		except AttributeError:
			return self.lhs


a = Foo(42.0)
b = Foo(7.0)
c = (a + b) / b
print(c)
print(c.eval())

c = a + (b / b)
print(c)
print(c.eval())

Output is:

$  ./test.py
((42.0 __add__ 7.0) __truediv__ 7.0)
7.0
(42.0 __add__ (7.0 __truediv__ 7.0))
43.0