code: def get_value(self, variable=None):
          
  
          if variable:
              self.get_values(variable)
              return self.__variables[variable]
          else:
              self.get_values()
              return foundations.common.get_first_item(self.__variables.values())
docs: Gets given environment variable value.
  
          :param variable: Variable to retrieve value.
          :type variable: unicode
          :return: Variable value.
          :rtype: unicode
  
          :note: If the **variable** argument is not given the first **self.__variables** attribute value will be returned.