Update bench.py photutils compatibility.

bench.py

@@ -110,14 +110,9 @@
     if HAVE_PHOTUTILS:
         t0 = time.time()
         for _ in range(0, nloop):
-            try:
-                bkg = photutils.background.Background(
-                    data, (64, 64)
-                )  # estimate background
-            except AttributeError:
-                bkg = photutils.background.Background2D(
-                    data, (64, 64)
-                )  # estimate background
+            from photutils import background
+
+            bkg = background.Background2D(data, (64, 64))  # estimate background
         t1 = time.time()
         t_pu = (t1 - t0) * 1.0e3 / nloop
         line += "      {0:7.2f} ms | {1:6.2f} |".format(t_pu, t_pu / t_sep)
@@ -163,6 +158,8 @@
         line += " {0:7.2f} us/aper |".format(t_sep)
 
         if HAVE_PHOTUTILS:
+            from photutils import aperture
+
             apertures = photutils.aperture.CircularAperture(np.column_stack((x, y)), r)
             t0 = time.time()
             for _ in range(0, nloop):
@@ -196,6 +193,8 @@
         line += " {0:7.2f} us/aper |".format(t_sep)
 
         if HAVE_PHOTUTILS:
+            from photutils import aperture
+
             apertures = photutils.aperture.EllipticalAperture(
                 np.column_stack((x, y)), a * r, b * r, theta
             )