parameters: (self)
return_statement: return self._exp_number
docstring: experiment number
          :return:
docstring_summary: experiment number
          :return:
docstring_tokens: experiment number : return :
function: def exp_number(self):
          """
          experiment number
          :return:
          """
          return self._exp_number
function_tokens: def exp_number ( self ) : return self . _exp_number