code: def __str__(self):
      return "ExecutionFailed: %d  %s\n%s" % (
          self.status,
          self.cmd,
          self.err,
      )
  
file_path: catboost/contrib/python/py/py2/py/_process/cmdexec.py
imports: import sys
  import subprocess
  import py
  from subprocess import Popen, PIPE
label_desc: Use image node_id 2 for calling the ExecutionFailed obj's underlying member method code with example usage: obj.__str__() and returns: unknown