code: def fill_missing_version(self):
      if self.version is not None:
          return
      dist = pkg_resources.working_set.by_key.get(self.name)
      self.version = dist.version if dist else None
  
imports: import functools
  import hashlib
  import os.path
  import re
  import sys
  from pathlib import Path
  import pkg_resources
  import sacred.optional
  from sacred import SETTINGS
  from sacred.utils import iter_prefixes
label_desc: Use image node_id 2 for calling the PackageDependency obj's underlying member method code with example usage: obj.fill_missing_version() without return types