text: """ here is a dummy documentation"""
  import os
  
  
  def square(a):
      """short description of the function square
  
      longish explanation: returns the square of a: :math:`a^2`
  
      :param a: an input argument
  
      :returns: a*a
      """
      return a*a
  
  
  assert 4 == square(2)