code: def import_(module, objects=None, via=None):
      
      if PY3:
          mod = __import__(module, fromlist=['*'])
      else:
          path = modules_mapping.get(module)
          if not path:
              raise Exception("Can't find the module %s in mappings." % module)
          if isinstance(path, list):
              if not via:
                  raise Exception("You should give a via parameter to enable import from py2.")
              path = via
          mod = __import__(path, fromlist=['*'])
  
      if objects:
          if not isinstance(objects, (list, tuple)):
              raise Exception("objects parameter should be a list or tuple.")
          r = []
          for x in objects:
              r.append(getattr(mod, x))
          if len(r) > 1:
              return tuple(r)
          else:
              return r[0]
      else:
          return mod
docs: :param module: py3 compatiable module path
      :param objects: objects want to imported, it should be a list
      :param via: for some py2 module, you should give the import path according the
          objects which you want to imported
      :return: object or module