remove empty lines

moviepy/video/io/sliders.py

@@ -40,8 +40,7 @@ def volume(x,y,z):
 
     sliders = []
 
-    for i, properties in enumerate(sliders_properties):
-
+    for i, properties in enumerate(sliders_properties):    
         ax = plt.axes([0.1 , 0.95-0.9*(i+1)*slider_width,
                        0.8 , 0.8* slider_width])
         if not isinstance(properties,dict):
@@ -52,31 +51,23 @@ def volume(x,y,z):
 
     # CREATE THE CALLBACK FUNCTIONS
 
-    def on_changed(event) : 
-
+    def on_changed(event) :     
         res = f(*(s.val for s in sliders))
-
         if res is not None:
-
             print( res )
 
     def on_key_press(event):
-
         if event.key is 'enter':
-
             on_changed(event)   
 
     figure.canvas.mpl_connect('key_press_event', on_key_press)
 
     # AUTOMATIC UPDATE ?
 
     if not wait_for_validation:
-
         for s in sliders :
-
             s.on_changed(on_changed)
 
 
     # DISPLAY THE SLIDERS
-
     plt.show()