As an example:
class Unevaluated(Expr):
def __new__(cls, wrapped_type, *args, **kwargs):
obj = Expr.__new__(cls, *args, **kwargs)
obj._wrapped_type = wrapped_type
kwargs["evaluate"] = False
obj._wrapped_object = wrapped_type(*args, **kwargs)
return obj
def func(self, *args, **kwargs):
return Unevaluated(self._wrapped_type, *args, **kwargs)
def __getattr__(self, name):
return getattr(self._wrapped_type, name)
def __str__(self):
return self._wrapped_object.__str__()
def __repr__(self):
return self._wrapped_object.__repr__()
def evaluate(self):
return self._wrapped_object.func(*self._wrapped_object.args)
So you would call *Unevaluated(Pow, 2, 3)* to represent *2**3* in the
unevaluated form.
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