diff --git a/skyproj/_skyproj.py b/skyproj/_skyproj.py
index b26e411..a3a548d 100644
--- a/skyproj/_skyproj.py
+++ b/skyproj/_skyproj.py
@@ -1,18 +1,15 @@
 import warnings
-import functools
 
 import matplotlib.pyplot as plt
 
 import numpy as np
 import hpgeom as hpg
 
-import mpl_toolkits.axisartist as axisartist
-import mpl_toolkits.axisartist.angle_helper as angle_helper
 from mpl_toolkits.axes_grid1.inset_locator import inset_axes
 from matplotlib.cm import ScalarMappable
 from matplotlib.colors import Normalize, LogNorm
 
-from .skycrs import get_crs, PlateCarreeCRS, GnomonicCRS, proj, proj_inverse
+from .skycrs import get_crs, GnomonicCRS, proj, proj_inverse
 from .hpx_utils import healpix_pixels_range, hspmap_to_xy, hpxmap_to_xy, healpix_to_xy, healpix_bin
 from .utils import wrap_values, _get_boundary_poly_xy, get_autoscale_vmin_vmax
 
diff --git a/skyproj/mpl_utils.py b/skyproj/mpl_utils.py
index b632654..57cdcb7 100644
--- a/skyproj/mpl_utils.py
+++ b/skyproj/mpl_utils.py
@@ -401,9 +401,6 @@ def draw(self, renderer):
             if not l.strip():
                 continue
 
-            override_ha = False
-            override_va = False
-
             self._ref_angle = a
             self.set_x(x)
             self.set_y(y)
@@ -411,12 +408,10 @@ def draw(self, renderer):
                 self.set_ha(ha_default)
             else:
                 self.set_ha(ha)
-                override_ha = True
             if va == "":
                 self.set_va(va_default)
             else:
                 self.set_va(va)
-                override_va = True
             self.set_text(l)
 
             # The following code is adapted from LabelBase.draw()
diff --git a/skyproj/skyaxes.py b/skyproj/skyaxes.py
index 8d4f266..7540fa4 100644
--- a/skyproj/skyaxes.py
+++ b/skyproj/skyaxes.py
@@ -6,12 +6,10 @@
 import matplotlib.axes
 from pyproj import Geod
 
-from .skycrs import PlateCarreeCRS, proj, proj_inverse
+from .skycrs import PlateCarreeCRS
 from .utils import wrap_values
 from .skygrid import SkyGridlines, SkyGridHelper
-from .mpl_utils import ExtremeFinderWrapped, WrappedFormatterDMS, SkyTickLabels
-from matplotlib.transforms import (
-    Affine2D, Bbox, IdentityTransform, ScaledTranslation)
+from .mpl_utils import SkyTickLabels
 
 
 __all__ = ["SkyAxes"]
diff --git a/skyproj/skycrs.py b/skyproj/skycrs.py
index 63bb083..6c8f278 100644
--- a/skyproj/skycrs.py
+++ b/skyproj/skycrs.py
@@ -1,6 +1,5 @@
 import math
 import numpy as np
-import functools
 
 from pyproj import CRS
 from pyproj import Transformer
diff --git a/skyproj/skygrid.py b/skyproj/skygrid.py
index 459b4d1..958b4db 100644
--- a/skyproj/skygrid.py
+++ b/skyproj/skygrid.py
@@ -1,7 +1,7 @@
 import functools
 import numpy as np
 import matplotlib.collections
-from matplotlib.transforms import Bbox, Transform
+from matplotlib.transforms import Bbox
 
 from .skycrs import proj, proj_inverse
 from .mpl_utils import ExtremeFinderWrapped, WrappedFormatterDMS
@@ -289,15 +289,15 @@ def get_grid_info(self, x1, y1, x2, y2):
             if np.min(lat_values) < -89.0 and np.max(lat_values) > 89.0:
                 use_equatorial_labels = True
 
-        inverted = False
+        # inverted = False
         if x1 < x2:
-            gi_side_map = {side: side for side in ['left', 'right']}
+            # gi_side_map = {side: side for side in ['left', 'right']}
             min_x = x1
             max_x = x2
         else:
-            gi_side_map = {'left': 'right',
-                           'right': 'left'}
-            inverted = True
+            # gi_side_map = {'left': 'right',
+            #                'right': 'left'}
+            # inverted = True
             min_x = x2
             max_x = x1
 
@@ -306,7 +306,7 @@ def get_grid_info(self, x1, y1, x2, y2):
                 ("lat", lat_levs, lat_factor, lat_values, lat_lines),
         ]:
             grid_info[lon_or_lat] = gi = {
-                "lines": [[l] for l in lines],
+                "lines": [[line] for line in lines],
                 "ticks": {"left": [], "right": [], "bottom": [], "top": []},
             }
             for (lx, ly), v, level in zip(lines, values, levs):