code: def enable(self, app=None):
      warn(
          "This function is deprecated since IPython 5.0 and will be removed in future versions.",
          DeprecationWarning,
          stacklevel=2,
      )
      os.environ["QT_API"] = "pyqt5"
      return Qt4InputHook.enable(self, app)
  
imports: import os
  import platform
  import sys
  from distutils.version import LooseVersion
  from warnings import warn
label_desc: Use image node_id 1 for calling the Qt5InputHook obj's underlying member method code with example usage: obj.enable(app) and returns: Qt4InputHook