docstr: Handle a key press
code: def on_key_down(self, event):
      """Handle a key press"""
      if (
          event.GetKeyCode() == wx.WXK_DELETE
          and self.fn_delete is not None
      ):
          paths = self.get_paths(self.FLAG_SELECTED_ONLY)
          self.remove_files(paths)
          self.fn_delete(paths)
          return
      event.Skip(True)
  
imports: import logging
  import os
  import sys
  import uuid
  from urllib.request import url2pathname
  from urllib.parse import urlparse
  import wx
  import wx.lib.scrolledpanel
  from cellprofiler_core.pipeline import ImageFile
  from cellprofiler_core.preferences import report_progress
label_desc: Use image node_id 41 for calling the PathListCtrl obj's underlying member method code with example usage: obj.on_key_down(event) without return types