code: def _check_py_version():
      if sys.version_info[0] < 3:
          raise Exception(
              "Please use Python 3. Python 2 is not supported."
          )
  
file_path: tf-quant-finance/tf_quant_finance/__init__.py
imports: import sys
  from tf_quant_finance import black_scholes
  from tf_quant_finance import datetime
  from tf_quant_finance import math
  from tf_quant_finance import models
  from tf_quant_finance import rates
  from tf_quant_finance import types
  from tf_quant_finance import utils
  from tensorflow.python.util.all_util import remove_undocumented
label_desc: Use image node_id 1 for calling a global function with example usage: _check_py_version() without return types