code: def prepare_all(py_ver):
      dst_path = yatest.common.source_path(
          os.path.join(
              PYTHON_PACKAGE_DIR, "ut", "large", "py_envs", py_ver
          )
      )
  
      python_binary = os.path.abspath(
          os.path.join(dst_path, "python", "bin", "python" + py_ver)
      )
      python_env = {
          "PYTHONPATH": ":".join(
              [
                  os.path.join(dst_path, d)
                  for d in ["catboost", "libs", "dynlibs"]
              ]
          ),
          "LD_LIBRARY_PATH": os.path.join(
              dst_path, "python/lib/x86_64-linux-gnu"
          ),
      }
  
      return python_binary, python_env
  
imports: import os
  import pytest
  import shutil
  import yatest.common
label_desc: Use image node_id 1 for calling a global function with example usage: prepare_all(py_ver) and returns: python_binary,  python_env