diff --git a/imgrate.py b/imgrate.py
index 070ba75..67ab8cf 100755
--- a/imgrate.py
+++ b/imgrate.py
@@ -49,13 +49,18 @@ class imgrate:
 
 
 if __name__ == '__main__':
-    ap = ArgumentParser()
-    ap.add_argument('images', type=str, nargs='+', help='')
-    args = ap.parse_args()
+    def parse_arguments():
+        ap = ArgumentParser()
+        ap.add_argument('images', type=str, nargs='+', help='')
+        return ap.parse_args()
 
-    ratings = {image: imgrate(image).quality for image in args.images}
-    maximum = max(ratings, key=ratings.get)
 
-    for rating in ratings.keys():
-        maxmark = '*' if rating == maximum and len(ratings) > 1 else ' '
-        print('{}imgrate("{}") = {}'.format(maxmark, rating, ratings[rating]))
+    def run(args):
+        ratings = {image: imgrate(image).quality for image in args.images}
+        maximum = max(ratings, key=ratings.get)
+
+        for rating in ratings.keys():
+            maxmark = '*' if rating == maximum and len(ratings) > 1 else ' '
+            print('{}imgrate("{}") = {}'.format(maxmark, rating, ratings[rating]))
+
+    run(parse_arguments())