Declare static methods with annotation (see #103)

src/client.py

@@ -1035,6 +1035,7 @@ class MCGAlbum:
                 return False
         return True
 
+    @staticmethod
     def compare(album1, album2, criterion=None, reverse=False):
         if criterion == None:
             criterion = SortOrder.TITLE

src/utils.py

@@ -13,6 +13,7 @@ class Utils:
     CSS_SELECTION = 'selection'
     STOCK_ICON_DEFAULT = 'image-x-generic-symbolic'
 
+    @staticmethod
     def load_pixbuf(data):
         loader = GdkPixbuf.PixbufLoader()
         try:
@@ -21,6 +22,7 @@ class Utils:
             loader.close()
         return loader.get_pixbuf()
 
+    @staticmethod
     def load_thumbnail(cache, client, album, size):
         cache_url = cache.create_filename(album)
         pixbuf = None
@@ -38,6 +40,7 @@ class Utils:
                 pixbuf.savev(cache_url, 'jpeg', [], [])
         return pixbuf
 
+    @staticmethod
     def create_artists_label(album):
         label = ', '.join(album.get_albumartists())
         if album.get_artists():
@@ -45,12 +48,14 @@ class Utils:
                 label, ", ".join(album.get_artists()))
         return label
 
+    @staticmethod
     def create_length_label(album):
         minutes = album.get_length() // 60
         seconds = album.get_length() - minutes * 60
 
         return locale.gettext("{}:{} minutes").format(minutes, seconds)
 
+    @staticmethod
     def create_track_title(track):
         title = track.get_title()
         if track.get_artists():
@@ -58,6 +63,7 @@ class Utils:
                 title, ", ".join(track.get_artists()))
         return title
 
+    @staticmethod
     def generate_id(values):
         if type(values) is not list:
             values = [values]