code: def _sha256(self):
      try:
          return self._hash
      except AttributeError:
          self._hash = _calculate_sha256_for_file(self.executable)
          return self._hash
  
imports: import os
  import sys
  import hashlib
  import filecmp
  from collections import namedtuple
  from jedi._compatibility import highest_pickle_protocol, which
  from jedi.cache import memoize_method, time_cache
  from jedi.evaluate.compiled.subprocess import CompiledSubprocess, EvaluatorSameProcess, EvaluatorSubprocess
  import parso
label_desc: Use image node_id 2 for calling the _BaseEnvironment obj's underlying member method code with example usage: obj._sha256() and returns: self, self