Python - 异常未处理“名称'main'未定义”

Question

I am currently learning python and would like some assistance.

I am unsure where the syntax is incorrect. It states "name 'main' is not defined"

I have seen other examples where the syntax looks the same but for some reason mine is not working.

 class Main(main):
    """description of class"""

    def main():
      print('starting etl')
      # establish connection for target database (sql-server)
      target_cnx = pyodbc.connect(**datawarehouse_db_config)    
      # loop through credentials

      # sql-server
      for config in sqlserver_db_config: 
        try:
          print("loading db: " + config['database'])
          etl_process(sqlserver_queries, target_cnx, config, 'sqlserver')
        except Exception as error:
          print("etl for {} has error".format(config['database']))
          print('error message: {}'.format(error))
          continue
      target_cnx.close()

    if __name__ == "__main__":
        main()

Any help will be much appreciated.

Answer 1

Your class Main tries to inherit from non-existent class main .

main is only defined as a method of class Main .

Looks like you only wanted to have a function main without the class Main .

def main():
  print('starting etl')
  # establish connection for target database (sql-server)
  target_cnx = pyodbc.connect(**datawarehouse_db_config)    
  # loop through credentials

  # sql-server
  for config in sqlserver_db_config: 
    try:
      print("loading db: " + config['database'])
      etl_process(sqlserver_queries, target_cnx, config, 'sqlserver')
    except Exception as error:
      print("etl for {} has error".format(config['database']))
      print('error message: {}'.format(error))
      continue
  target_cnx.close()

if __name__ == "__main__":
    main()