code: def global_import(mod_name):
      
      mod_tuple = imp.find_module(mod_name, sys.path[1:])
      mod = imp.load_module(mod_name, mod_tuple[0], mod_tuple[1], mod_tuple[2])
  
      return mod
docs: This function search sys.path[1:], return specified module.
      sys.path[1:] means the directories other than current directory('./').
  
      'mod_name' as an argument is string type object.