code: def prepend_to_path(dir):
      os.environ["PATH"] = dir + os.pathsep + os.environ["PATH"]
  
file_path: catboost/contrib/python/testpath/py2/testpath/commands.py
imports: import contextlib
  import json
  import os
  import shutil
  import sys
  import tempfile
label_desc: Use image node_id 1 for calling a global function with example usage: prepend_to_path(dir) without return types