class_docstr: Validate input from a simple callable.
class_docstr_tok: ["Validate","input","from","a","simple","callable","."]
code: def __repr__(self) -> str:
      return f"Validator.from_callable({self.func!r})"
  
imports: from __future__ import annotations
  from abc import ABCMeta, abstractmethod
  from typing import Callable
  from prompt_toolkit.eventloop import run_in_executor_with_context
  from .document import Document
  from .filters import FilterOrBool, to_filter
label_desc: Use image node_id 2 for calling the _ValidatorFromCallable obj's underlying member method code with example usage: obj.__repr__() and returns: str, self, str