new_contents: #! /usr/bin/env python
  # -*- coding: utf-8 -*-
  """Tests of MathClass in pygeoc.utils
  
      @author: Liangjun Zhu
  
      @changlog: 17-09-16 lj - origin version.\n
  """
  from pygeoc.utils import MathClass
  import pytest
  
  
  def test_mathclass_isnumerical():
      assert MathClass.isnumerical('78') == True
      assert MathClass.isnumerical('1.e-5') == True
      assert MathClass.isnumerical(None) == False
      assert MathClass.isnumerical('a1.2') == False
subject: add pytest demo