code: def get_timestamp(dt):
      """
      Python2 compatible way to compute the timestamp (seconds since 1/1/1970)
      """
      return (
          dt.replace(tzinfo=None) - datetime(1970, 1, 1)
      ).total_seconds()
  
file_path: metaflow/metaflow/plugins/datatools/s3/s3util.py
imports: from __future__ import print_function
  from datetime import datetime
  import random
  import time
  import sys
  import os
  from metaflow.exception import MetaflowException
  from metaflow.metaflow_config import DATATOOLS_CLIENT_PARAMS, DATATOOLS_SESSION_VARS, S3_RETRY_COUNT, RETRY_WARNING_THRESHOLD
label_desc: Use image node_id 4 for calling a global function with example usage: get_timestamp(dt) and returns: unknown