code: def main():
      
      log = logging.getLogger(mod_logger + '.main')
      parser = argparse.ArgumentParser(description='This Python module retrieves artifacts from Nexus.')
      parser.add_argument('-u', '--url', help='Nexus Server URL', required=False)
      parser.add_argument('-g', '--groupId', help='Group ID', required=True)
      parser.add_argument('-a', '--artifactId', help='Artifact ID', required=True)
      parser.add_argument('-v', '--version', help='Artifact Version', required=True)
      parser.add_argument('-c', '--classifier', help='Artifact Classifier', required=False)
      parser.add_argument('-p', '--packaging', help='Artifact Packaging', required=True)
      parser.add_argument('-r', '--repo', help='Nexus repository name', required=False)
      parser.add_argument('-d', '--destinationDir', help='Directory to download to', required=True)
      parser.add_argument('-n', '--username', help='Directory to download to', required=True)
      parser.add_argument('-w', '--password', help='Directory to download to', required=True)
      args = parser.parse_args()
      try:
          get_artifact(
              nexus_url=args.url,
              group_id=args.groupId,
              artifact_id=args.artifactId,
              version=args.version,
              classifier=args.classifier,
              packaging=args.packaging,
              repo=args.repo,
              destination_dir=args.destinationDir,
              username=args.username,
              password=args.password
          )
      except Exception as e:
          msg = 'Caught exception {n}, unable for download artifact from Nexus\n{s}'.format(
              n=e.__class__.__name__, s=e)
          log.error(msg)
          return
docs: Handles calling this module as a script
  
      :return: None