def close(self):
        if self.file and not self.file.closed:
            self.file.close()
            self.file = None
Checks if Df/f is the derivative of an element of k(t).
dataset/ETHPy150Open ioflo/ioflo/ioflo/base/logging.py/Log.close--crossover with--dataset/ETHPy150Open sympy/sympy/sympy/integrals/prde.py/is_deriv_k