code: def region_name(sagemaker_session):
      return sagemaker_session.boto_session.region_name
  
file_path: sagemaker-python-sdk/tests/integ/sagemaker/workflow/test_emr_steps.py
imports: from __future__ import absolute_import
  import re
  import pytest
  from sagemaker import get_execution_role, utils
  from sagemaker.workflow.emr_step import EMRStep, EMRStepConfig
  from sagemaker.workflow.parameters import ParameterInteger
  from sagemaker.workflow.pipeline import Pipeline
label_desc: Use image node_id 3 for calling a global function with example usage: region_name(sagemaker_session) and returns: sagemaker_session