refactor: replace string concatenations with f-strings

youtube/playlist.py

@@ -20,7 +20,7 @@ def playlist_ctoken(playlist_id, offset, include_shorts=True):
 
     continuation_info = proto.string(3, proto.percent_b64encode(offset))
 
-    playlist_id = proto.string(2, 'VL' + playlist_id)
+    playlist_id = proto.string(2, f'VL{playlist_id}')
     pointless_nest = proto.string(80226972, playlist_id + continuation_info)
 
     return base64.urlsafe_b64encode(pointless_nest).decode('ascii')
@@ -30,7 +30,7 @@ def playlist_first_page(playlist_id, report_text="Retrieved playlist",
                         use_mobile=False):
     # Use innertube API (pbj=1 no longer works for many playlists)
     key = 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8'
-    url = 'https://www.youtube.com/youtubei/v1/browse?key=' + key
+    url = f'https://www.youtube.com/youtubei/v1/browse?key={key}'
 
     data = {
         'context': {
@@ -41,7 +41,7 @@ def playlist_first_page(playlist_id, report_text="Retrieved playlist",
                 'clientVersion': '2.20240327.00.00',
             },
         },
-        'browseId': 'VL' + playlist_id,
+        'browseId': f'VL{playlist_id}',
     }
 
     content_type_header = (('Content-Type', 'application/json'),)
@@ -58,7 +58,7 @@ def get_videos(playlist_id, page, include_shorts=True, use_mobile=False,
     page_size = 100
 
     key = 'AIzaSyAO_FJ2SlqU8Q4STEHLGCilw_Y9_11qcW8'
-    url = 'https://www.youtube.com/youtubei/v1/browse?key=' + key
+    url = f'https://www.youtube.com/youtubei/v1/browse?key={key}'
 
     ctoken = playlist_ctoken(playlist_id, (int(page)-1)*page_size,
                              include_shorts=include_shorts)
@@ -97,7 +97,7 @@ def get_playlist_page():
     if playlist_id.startswith('RD'):
         first_video_id = playlist_id[2:]  # video ID after 'RD' prefix
         return flask.redirect(
-            util.URL_ORIGIN + '/watch?v=' + first_video_id + '&list=' + playlist_id,
+            f'{util.URL_ORIGIN}/watch?v={first_video_id}&list={playlist_id}',
             302
         )
 
@@ -132,9 +132,9 @@ def get_playlist_page():
         if 'id' in item and not item.get('thumbnail'):
             item['thumbnail'] = f"{settings.img_prefix}https://i.ytimg.com/vi/{item['id']}/hqdefault.jpg"
 
-        item['url'] += '&list=' + playlist_id
+        item['url'] += f'&list={playlist_id}'
         if item['index']:
-            item['url'] += '&index=' + str(item['index'])
+            item['url'] += f'&index={item["index"]}'
 
     video_count = yt_data_extract.deep_get(info, 'metadata', 'video_count')
     if video_count is None: