class_docstr: (Immutable binding class.)
code: def __init__(
      self, keys, handler, filter=None, eager=None, save_before=None
  ):
      assert isinstance(keys, tuple)
      assert callable(handler)
      assert isinstance(filter, CLIFilter)
      assert isinstance(eager, CLIFilter)
      assert callable(save_before)
  
      self.keys = keys
      self.handler = handler
      self.filter = filter
      self.eager = eager
      self.save_before = save_before
  
imports: from __future__ import unicode_literals
  from abc import ABCMeta, abstractmethod
  from prompt_toolkit.cache import SimpleCache
  from prompt_toolkit.filters import CLIFilter, to_cli_filter, Never
  from prompt_toolkit.keys import Key, Keys
  from six import text_type, with_metaclass
label_desc: Use image node_id 1 to create a new _Binding object from inherited base classes: object with example: obj = _Binding(keys, handler, filter, eager, save_before)