Use f-string in error message

lucaznch · lucaznch · commit b036809b69b4 · 2026-03-25T20:08:19.000Z
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -6462,9 +6462,8 @@ def _pcolorargs(self, funcname, *args, shading='auto', **kwargs):
                     Y = 0.25 * (Y[:-1, :-1] + Y[:-1, 1:] + Y[1:, 1:] + Y[1:, :-1])
                     shading = 'gouraud'
                 else:
-                    raise TypeError('Dimensions of C %s are incompatible with'
-                                    ' X (%d) and/or Y (%d); see help(%s)' % (
-                                        C.shape, Nx, Ny, funcname))
+                    raise TypeError(f'Dimensions of C {C.shape} are incompatible with'
+                                    f' X ({Nx}) and/or Y ({Ny}); see help({funcname})')
             if shading == 'nearest':
                 # grid is specified at the center, so define corners
                 # at the midpoints between the grid centers and then use the
