implement Frames.end and Frames.count_frames as properties

itten/movie.py

@@ -30,8 +30,37 @@ class Frames(object):
         self.frames = self.get_frame_list()
         self.frm_length = self.count_total_frames()
         self.start = start
-        self.end = self._get_end_frame(end)
-        self.frm_cnt = self.count_frames()
+        self.end = end
+        self.frm_cnt = 0
+
+    @property
+    def end(self):
+        return self.__end
+
+    @end.setter
+    def end(self, nr):
+        if nr == 0:
+            self.__end = self.frm_length
+            self.frm_cnt = self.count_frames
+        elif nr > self.frm_length:
+            self.__end = self.frm_length - 1
+            self.frm_cnt = self.count_frames
+        elif nr < self.start:
+            self.__end = self.start + 1
+            self.frm_cnt = self.count_frames
+        else:
+            self.__end = nr
+            self.frm_cnt = self.count_frames
+
+    @property
+    def frm_cnt(self):
+        return self.__frm_cnt
+
+    @frm_cnt.setter
+    def frm_cnt(self, nr):
+        count = self.count_frames()
+        print(count)
+        self.__frm_cnt = count
 
     def get_frame_list(self):
         frm_path = Path(self.folder)