(self)
return self.__class__
The top-level function in an expression.

        The following should hold for all objects::

            >> x == x.func(*x.args)

        Examples
        ========

        >>> from sympy.abc import x
        >>> a = 2*x
        >>> a.func
        <class 'sympy.core.mul.Mul'>
        >>> a.args
        (2, x)
        >>> a.func(*a.args)
        2*x
        >>> a == a.func(*a.args)
        True
The top-level function in an expression.
The top - level function in an expression .
def func(self):
        """
        The top-level function in an expression.

        The following should hold for all objects::

            >> x == x.func(*x.args)

        Examples
        ========

        >>> from sympy.abc import x
        >>> a = 2*x
        >>> a.func
        <class 'sympy.core.mul.Mul'>
        >>> a.args
        (2, x)
        >>> a.func(*a.args)
        2*x
        >>> a == a.func(*a.args)
        True

        """
        return self.__class__
def func ( self ) : return self . __class__