Fix flake8 errors

Oops, my bad.

Author: LemonBoy

lib/mpl_toolkits/mplot3d/axes3d.py

@@ -1703,8 +1703,8 @@ def plot_surface(self, X, Y, Z, *, norm=None, vmin=None,
                         colset.append(fcolors[rs][cs])
 
         # In cases where there are non-finite values in the data (possibly NaNs from
-        # masked arrays), artifacts can be introduced. Here check whether such values are
-        # present and remove them.
+        # masked arrays), artifacts can be introduced. Here check whether such values
+        # are present and remove them.
         if not isinstance(polys, np.ndarray) or not np.isfinite(polys).all():
             new_polys = []
             new_colset = []

lib/mpl_toolkits/mplot3d/tests/test_axes3d.py

@@ -2239,7 +2239,7 @@ def test_surface3d_zsort_inf():
     fig = plt.figure()
     ax = fig.add_subplot(projection='3d')
 
-    x, y = np.mgrid[-2:2:0.1,-2:2:0.1]
+    x, y = np.mgrid[-2:2:0.1, -2:2:0.1]
     z = np.sin(x)**2 + np.cos(y)**2
     z[x.shape[0] // 2:, x.shape[1] // 2:] = np.inf