fix import guard

Author: tomvanmele

src/compas/utilities/images.py

@@ -3,24 +3,25 @@
 from __future__ import division
 
 import os
+import compas
 
-try:
+if not compas.IPY:
     import imageio
-except ImportError:
-    pass
 
 
-__all__ = ['gif_from_images']
+__all__ = ["gif_from_images"]
 
 
-def gif_from_images(files,
-                    gif_path,
-                    fps=10,
-                    loop=0,
-                    reverse=False,
-                    pingpong=False,
-                    subrectangles=True,
-                    delete_files=False):
+def gif_from_images(
+    files,
+    gif_path,
+    fps=10,
+    loop=0,
+    reverse=False,
+    pingpong=False,
+    subrectangles=True,
+    delete_files=False,
+):
     """Create an animated GIF from a series of images.
 
     Parameters
@@ -49,11 +50,9 @@ def gif_from_images(files,
         files.reverse()
     if pingpong:
         files += files[::-1]
-    with imageio.get_writer(gif_path,
-                            mode='I',
-                            fps=fps,
-                            loop=loop,
-                            subrectangles=subrectangles) as writer:
+    with imageio.get_writer(
+        gif_path, mode="I", fps=fps, loop=loop, subrectangles=subrectangles
+    ) as writer:
         for filename in files:
             image = imageio.imread(filename)
             writer.append_data(image)