diff --git a/.flake8 b/.flake8
index 714431f9916a..4560fc4d319f 100644
--- a/.flake8
+++ b/.flake8
@@ -65,7 +65,6 @@ per-file-ignores =
     lib/matplotlib/pyplot.py: F401, F811
     lib/matplotlib/style/__init__.py: F401
     lib/matplotlib/testing/conftest.py: F401
-    lib/matplotlib/testing/decorators.py: F401
     lib/matplotlib/tests/conftest.py: F401
     lib/matplotlib/tests/test_backend_qt.py: F401
     lib/matplotlib/tests/test_mathtext.py: E501
diff --git a/lib/matplotlib/axes/_secondary_axes.py b/lib/matplotlib/axes/_secondary_axes.py
index cfa5bc676d31..2cd0934191bb 100644
--- a/lib/matplotlib/axes/_secondary_axes.py
+++ b/lib/matplotlib/axes/_secondary_axes.py
@@ -3,7 +3,6 @@
 import matplotlib.cbook as cbook
 import matplotlib.docstring as docstring
 import matplotlib.ticker as mticker
-import matplotlib.transforms as mtransforms
 from matplotlib.axes import _axes
 from matplotlib.axes._base import _AxesBase
 
diff --git a/lib/matplotlib/backends/backend_gtk3cairo.py b/lib/matplotlib/backends/backend_gtk3cairo.py
index 92bab8d336e7..af290902d8a6 100644
--- a/lib/matplotlib/backends/backend_gtk3cairo.py
+++ b/lib/matplotlib/backends/backend_gtk3cairo.py
@@ -2,7 +2,6 @@
 
 from . import backend_cairo, backend_gtk3
 from .backend_gtk3 import Gtk, _BackendGTK3
-from matplotlib.backend_bases import cursors
 
 
 class RendererGTK3Cairo(backend_cairo.RendererCairo):
diff --git a/lib/matplotlib/bezier.py b/lib/matplotlib/bezier.py
index cdd5e4771e8c..b36e2c1aef0a 100644
--- a/lib/matplotlib/bezier.py
+++ b/lib/matplotlib/bezier.py
@@ -10,6 +10,7 @@
 
 import matplotlib.cbook as cbook
 
+
 # same algorithm as 3.8's math.comb
 @np.vectorize
 @lru_cache(maxsize=128)
diff --git a/lib/matplotlib/figure.py b/lib/matplotlib/figure.py
index cd4bc6137b52..4ba402e08654 100644
--- a/lib/matplotlib/figure.py
+++ b/lib/matplotlib/figure.py
@@ -29,7 +29,7 @@
 
 from matplotlib.axes import Axes, SubplotBase, subplot_class_factory
 from matplotlib.blocking_input import BlockingMouseInput, BlockingKeyMouseInput
-from matplotlib.gridspec import GridSpec, SubplotSpec
+from matplotlib.gridspec import GridSpec
 import matplotlib.legend as mlegend
 from matplotlib.patches import Rectangle
 from matplotlib.text import Text
diff --git a/lib/matplotlib/gridspec.py b/lib/matplotlib/gridspec.py
index cd07136beb80..dd1aba5738b5 100644
--- a/lib/matplotlib/gridspec.py
+++ b/lib/matplotlib/gridspec.py
@@ -225,7 +225,6 @@ def _check_gridspec_exists(figure, nrows, ncols):
         # else gridspec not found:
         return GridSpec(nrows, ncols, figure=figure)
 
-
     def __getitem__(self, key):
         """Create and return a `.SubplotSpec` instance."""
         nrows, ncols = self.get_geometry()
diff --git a/lib/matplotlib/rcsetup.py b/lib/matplotlib/rcsetup.py
index 51b290802d6a..3197c2d911dd 100644
--- a/lib/matplotlib/rcsetup.py
+++ b/lib/matplotlib/rcsetup.py
@@ -20,7 +20,6 @@
 import operator
 import os
 import re
-import sys
 
 import numpy as np
 
diff --git a/lib/matplotlib/testing/decorators.py b/lib/matplotlib/testing/decorators.py
index b8d7e3a3f22c..15d79f9fbc84 100644
--- a/lib/matplotlib/testing/decorators.py
+++ b/lib/matplotlib/testing/decorators.py
@@ -10,7 +10,6 @@
 import unittest
 import warnings
 
-import matplotlib as mpl
 import matplotlib.style
 import matplotlib.units
 import matplotlib.testing