class_docstr: Interface for Neptune objects that supports subscripting (selecting namespaces)
  It could be a Run, Model, ModelVersion, Project or already selected namespace (Handler).
  
  Example:
      >>> from neptune import init_run
      >>> from neptune.typing import SupportsNamespaces
      >>> class NeptuneCallback:
      ...     # Proper type hinting of `start_from` parameter.
      ...     def __init__(self, start_from: SupportsNamespaces):
      ...         self._start_from = start_from
      ...
      ...     def log_accuracy(self, accuracy: float) -> None:
      ...         self._start_from["train/acc"] = accuracy
      ...
      >>> run = init_run()
      >>> callback = NeptuneCallback(start_from=run)
      >>> callback.log_accuracy(0.8)
      >>> # or
      ... callback = NeptuneCallback(start_from=run["some/random/path"])
      >>> callback.log_accuracy(0.8)
code: def __delitem__(self, path) -> None:
      ...
  
file_path: neptune-client/src/neptune/metadata_containers/abstract.py
imports: from abc import ABC, abstractmethod
  from typing import TYPE_CHECKING, Callable, Optional, Union
label_desc: Use image node_id 3 for calling the SupportsNamespaces obj's underlying member method code with example usage: obj.__delitem__(path) without return types