class_docstr: Dictiory that maps input sequences to a boolean indicating whether there is
  any key that start with this characters.
code: def __missing__(self, prefix):
      # (hard coded) If this could be a prefix of a CPR response, return
      # True.
      if _cpr_response_prefix_re.match(
          prefix
      ) or _mouse_event_prefix_re.match(prefix):
          result = True
      else:
          # If this could be a prefix of anything else, also return True.
          result = any(
              v
              for k, v in ANSI_SEQUENCES.items()
              if k.startswith(prefix) and k != prefix
          )
  
      self[prefix] = result
      return result
  
imports: from __future__ import unicode_literals
  import os
  import re
  import six
  import termios
  import tty
  from six.moves import range
  from ..keys import Keys
  from ..key_binding.input_processor import KeyPress
label_desc: Use image node_id 1 for calling the _IsPrefixOfLongerMatchCache obj's underlying member method code with example usage: obj.__missing__(prefix) and returns: result