Merge pull request matplotlib#30626 from QuLogic/fix-f401

MNT: Fix new F401 unused imports warnings

Author: timhoffm

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

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__)
 

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.