code: def get_editor(self):
      if self.editor is not None:
          return self.editor
      for key in "VISUAL", "EDITOR":
          rv = os.environ.get(key)
          if rv:
              return rv
      if WIN:
          return "notepad"
      for editor in "sensible-editor", "vim", "nano":
          if os.system("which {} >/dev/null 2>&1".format(editor)) == 0:
              return editor
      return "vi"
  
imports: import contextlib
  import math
  import os
  import sys
  import time
  from ._compat import _default_text_stdout
  from ._compat import CYGWIN
  from ._compat import get_best_encoding
  from ._compat import int_types
  from ._compat import isatty
  from ._compat import open_stream
  from ._compat import range_type
  from ._compat import strip_ansi
  from ._compat import term_len
  from ._compat import WIN
  from .exceptions import ClickException
  from .utils import echo
label_desc: Use image node_id 2 for calling the Editor obj's underlying member method code with example usage: obj.get_editor() and returns: str, self, str, rv, editor