function.py 文件源码

def _diff_wrt(self):
        """Allow derivatives wrt Derivatives if it contains a function.

        Examples
        ========

            >>> from sympy import Function, Symbol, Derivative
            >>> f = Function('f')
            >>> x = Symbol('x')
            >>> Derivative(f(x),x)._diff_wrt
            True
            >>> Derivative(x**2,x)._diff_wrt
            False
        """
        if self.expr.is_Function:
            return True
        else:
            return False