code: def size_file(self, path):
      file_exists = self.is_file([path])[0]
      if file_exists:
          path = self.full_uri(path)
          try:
              return os.path.getsize(path)
          except OSError:
              return None
      return None
  
file_path: metaflow/metaflow/plugins/datastores/local_storage.py
imports: import json
  import os
  from metaflow.metaflow_config import DATASTORE_LOCAL_DIR, DATASTORE_SYSROOT_LOCAL
  from metaflow.datastore.datastore_storage import CloseAfterUse, DataStoreStorage
label_desc: Use image node_id 5 for calling the LocalStorage obj's underlying member method code with example usage: obj.size_file(path) and returns: None, os, None