How to use the pyflink.dataset.ExecutionEnvironment.get_execution_environment function in pyflink

def setUp(self):
        super(PyFlinkBatchTableTestCase, self).setUp()
        self.env = ExecutionEnvironment.get_execution_environment()
        self.env.set_parallelism(2)
        self.t_env = BatchTableEnvironment.create(self.env)

def word_count():
    content = "line Licensed to the Apache Software Foundation ASF under one " \
              "line or more contributor license agreements See the NOTICE file " \
              "line distributed with this work for additional information " \
              "line regarding copyright ownership The ASF licenses this file " \
              "to you under the Apache License Version the " \
              "License you may not use this file except in compliance " \
              "with the License"

    t_config = TableConfig()
    env = ExecutionEnvironment.get_execution_environment()
    t_env = BatchTableEnvironment.create(env, t_config)

    # register Results table in table environment
    tmp_dir = tempfile.gettempdir()
    result_path = tmp_dir + '/result'
    if os.path.exists(result_path):
        try:
            if os.path.isfile(result_path):
                os.remove(result_path)
            else:
                shutil.rmtree(result_path)
        except OSError as e:
            logging.error("Error removing directory: %s - %s.", e.filename, e.strerror)

    logging.info("Results directory: %s", result_path)