diff --git a/lib/matplotlib/backends/backend_webagg.py b/lib/matplotlib/backends/backend_webagg.py
index dfc5747ef77c..e4808e8d0d32 100644
--- a/lib/matplotlib/backends/backend_webagg.py
+++ b/lib/matplotlib/backends/backend_webagg.py
@@ -21,14 +21,12 @@
 import threading
 
 try:
-    import tornado
+    import tornado.web
+    import tornado.ioloop
+    import tornado.websocket
 except ImportError as err:
     raise RuntimeError("The WebAgg backend requires Tornado.") from err
 
-import tornado.web
-import tornado.ioloop
-import tornado.websocket
-
 import matplotlib as mpl
 from matplotlib.backend_bases import _Backend
 from matplotlib._pylab_helpers import Gcf
diff --git a/lib/matplotlib/backends/backend_wx.py b/lib/matplotlib/backends/backend_wx.py
index 6645077defc9..0acb4499ed87 100644
--- a/lib/matplotlib/backends/backend_wx.py
+++ b/lib/matplotlib/backends/backend_wx.py
@@ -30,7 +30,7 @@
 from matplotlib.transforms import Affine2D
 
 import wx
-import wx.svg
+import wx.svg  # noqa: F401
 
 _log = logging.getLogger(__name__)
 
diff --git a/lib/matplotlib/pyplot.py b/lib/matplotlib/pyplot.py
index 196b4cdb75d3..cecd3dc24737 100644
--- a/lib/matplotlib/pyplot.py
+++ b/lib/matplotlib/pyplot.py
@@ -58,7 +58,6 @@
 
 from cycler import cycler  # noqa: F401
 import matplotlib
-import matplotlib.colorbar
 import matplotlib.image
 from matplotlib import _api
 # Re-exported (import x as x) for typing.