如果环境变量仅被单个函数使用，是否有理由在函数本身之外定义它们？

示例：

# Env variables retrieved **inside** function

def retrieve_keyvault_secrets(kv_client):
    try:
        dl_s3_access_key = kv_client.get_secret(os.environ["S3_AK_SECRET_NAME"])
        dl_s3_secret_key = kv_client.get_secret(os.envrion["S3_SK_SECRET_NAME"])
    except Exception as e:
        logging.error(f'Error retrieving key vault secrets: {e}')
    return dl_s3_access_key,dl_s3_secret_key

对比

# Env variables defined **outside** function and passed in

dl_s3_access_key = os.environ["S3_AK_SECRET_NAME"]
dl_s3_secret_key = os.envrion["S3_SK_SECRET_NAME"]

def retrieve_keyvault_secrets(kv_client,dl_s3_access_key,dl_s3_secret_key):
    try:
        dl_s3_access_key = kv_client.get_secret(dl_s3_access_key)
        dl_s3_secret_key = kv_client.get_secret(dl_s3_secret_key)
    except Exception as e:
        logging.error(f'Error retrieving key vault secrets: {e}')
    return dl_s3_access_key,dl_s3_secret_key