diff --git a/IPython/terminal/pt_inputhooks/qt.py b/IPython/terminal/pt_inputhooks/qt.py
index 4040b91..b7683b8 100644
--- a/IPython/terminal/pt_inputhooks/qt.py
+++ b/IPython/terminal/pt_inputhooks/qt.py
@@ -19,17 +19,17 @@ def inputhook(context):
     global _appref
     app = QtCore.QCoreApplication.instance()
     if not app:
-        if sys.platform == "linux":
-            if not os.environ.get("DISPLAY") and not os.environ.get("WAYLAND_DISPLAY"):
+        if sys.platform == 'linux':
+            if not os.environ.get('DISPLAY') \
+                    and not os.environ.get('WAYLAND_DISPLAY'):
                 import warnings
-
                 global _already_warned
                 if not _already_warned:
                     _already_warned = True
                     warnings.warn(
-                        "The DISPLAY or WAYLAND_DISPLAY environment variable is "
-                        "not set or empty and Qt5 requires this environment "
-                        "variable. Deactivate Qt5 code."
+                        'The DISPLAY or WAYLAND_DISPLAY environment variable is '
+                        'not set or empty and Qt5 requires this environment '
+                        'variable. Deactivate Qt5 code.'
                     )
                 return
         QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
@@ -43,7 +43,7 @@ def inputhook(context):
 
     event_loop = QtCore.QEventLoop(app)
 
-    if sys.platform == "win32":
+    if sys.platform == 'win32':
         # The QSocketNotifier method doesn't appear to work on Windows.
         # Use polling instead.
         timer = QtCore.QTimer()
@@ -55,7 +55,8 @@ def inputhook(context):
     else:
         # On POSIX platforms, we can use a file descriptor to quit the event
         # loop when there is input ready to read.
-        notifier = QtCore.QSocketNotifier(context.fileno(), QtCore.QSocketNotifier.Read)
+        notifier = QtCore.QSocketNotifier(context.fileno(),
+                                          QtCore.QSocketNotifier.Read)
         try:
             # connect the callback we care about before we turn it on
             # lambda is necessary as PyQT inspect the function signature to know