diff --git a/supysonic/api/__init__.py b/supysonic/api/__init__.py
index 0d612aa..4965d4c 100644
--- a/supysonic/api/__init__.py
+++ b/supysonic/api/__init__.py
@@ -24,7 +24,7 @@ api = Blueprint("api", __name__)
 
 def api_routing(endpoint):
     def decorator(func):
-        viewendpoint = "{}.view".format(endpoint)
+        viewendpoint = f"{endpoint}.view"
         api.add_url_rule(endpoint, view_func=func, methods=["GET", "POST"])
         api.add_url_rule(viewendpoint, view_func=func, methods=["GET", "POST"])
         return func
diff --git a/supysonic/api/annotation.py b/supysonic/api/annotation.py
index ae1fa4f..b1cec69 100644
--- a/supysonic/api/annotation.py
+++ b/supysonic/api/annotation.py
@@ -29,11 +29,11 @@ def star_single(cls, starcls, eid):
     try:
         e = cls[eid]
     except cls.DoesNotExist:
-        raise NotFound("{} {}".format(cls.__name__, eid))
+        raise NotFound(f"{cls.__name__} {eid}")
 
     try:
         starcls[request.user, eid]
-        raise GenericError("{} {} already starred".format(cls.__name__, eid))
+        raise GenericError(f"{cls.__name__} {eid} already starred")
     except starcls.DoesNotExist:
         pass
 
diff --git a/supysonic/api/exceptions.py b/supysonic/api/exceptions.py
index 48e7a42..dce00b9 100644
--- a/supysonic/api/exceptions.py
+++ b/supysonic/api/exceptions.py
@@ -21,7 +21,7 @@ class SubsonicAPIException(HTTPException):
 
     def __str__(self):
         code = self.api_code if self.api_code is not None else "??"
-        return "{}: {}".format(code, self.message)
+        return f"{code}: {self.message}"
 
 
 class GenericError(SubsonicAPIException):
@@ -38,7 +38,7 @@ class ServerError(GenericError):
 
 class UnsupportedParameter(GenericError):
     def __init__(self, parameter, *args, **kwargs):
-        message = "Unsupported parameter '{}'".format(parameter)
+        message = f"Unsupported parameter '{parameter}'"
         super().__init__(message, *args, **kwargs)
 
 
@@ -89,7 +89,7 @@ class NotFound(SubsonicAPIException):
 
     def __init__(self, entity, *args, **kwargs):
         super().__init__(*args, **kwargs)
-        self.message = "{} not found".format(entity)
+        self.message = f"{entity} not found"
 
 
 class AggregateException(SubsonicAPIException):
diff --git a/supysonic/api/formatters.py b/supysonic/api/formatters.py
index c9f6375..1a15a2c 100644
--- a/supysonic/api/formatters.py
+++ b/supysonic/api/formatters.py
@@ -82,7 +82,7 @@ class JSONPFormatter(JSONBaseFormatter):
             )
 
         rv = self._subsonicify(elem, data)
-        rv = "{}({})".format(self.__callback, json.dumps(rv))
+        rv = f"{self.__callback}({json.dumps(rv)})"
         rv = make_response(rv)
         rv.mimetype = "application/javascript"
         return rv
diff --git a/supysonic/api/media.py b/supysonic/api/media.py
index f43311d..a5d3f0f 100644
--- a/supysonic/api/media.py
+++ b/supysonic/api/media.py
@@ -115,14 +115,14 @@ def stream_media():
     if dst_suffix != src_suffix or dst_bitrate != res.bitrate:
         # Requires transcoding
         cache = current_app.transcode_cache
-        cache_key = "{}-{}.{}".format(res.id, dst_bitrate, dst_suffix)
+        cache_key = f"{res.id}-{dst_bitrate}.{dst_suffix}"
 
         try:
             response = send_file(
                 cache.get(cache_key), mimetype=dst_mimetype, conditional=True
             )
         except CacheMiss:
-            transcoder = config.get("transcoder_{}_{}".format(src_suffix, dst_suffix))
+            transcoder = config.get(f"transcoder_{src_suffix}_{dst_suffix}")
             decoder = config.get("decoder_" + src_suffix) or config.get("decoder")
             encoder = config.get("encoder_" + dst_suffix) or config.get("encoder")
             if not transcoder and (not decoder or not encoder):
@@ -134,10 +134,10 @@ def stream_media():
                     logger.info(message)
                     raise GenericError(message)
 
-            transcoder, decoder, encoder = [
+            transcoder, decoder, encoder = (
                 prepare_transcoding_cmdline(x, res, src_suffix, dst_suffix, dst_bitrate)
                 for x in (transcoder, decoder, encoder)
-            ]
+            )
             try:
                 if transcoder:
                     dec_proc = None
@@ -280,7 +280,7 @@ def download_media():
         raise GenericError("Nothing to download")
 
     resp = Response(z, mimetype="application/zip")
-    resp.headers["Content-Disposition"] = "attachment; filename={}.zip".format(rv.name)
+    resp.headers["Content-Disposition"] = f"attachment; filename={rv.name}.zip"
     resp.headers["Content-Length"] = len(z)
     return resp
 
@@ -291,7 +291,7 @@ def _cover_from_track(obj):
     Returns None if no cover art is available.
     """
     cache = current_app.cache
-    cache_key = "{}-cover".format(obj.id)
+    cache_key = f"{obj.id}-cover"
     try:
         return cache.get(cache_key)
     except CacheMiss:
@@ -383,15 +383,15 @@ def cover_art():
         mimetype = None
         if os.path.splitext(cover_path)[1].lower() not in EXTENSIONS:
             with Image.open(cover_path) as im:
-                mimetype = "image/{}".format(im.format.lower())
+                mimetype = f"image/{im.format.lower()}"
         return send_file(cover_path, mimetype=mimetype)
 
     with Image.open(cover_path) as im:
-        mimetype = "image/{}".format(im.format.lower())
+        mimetype = f"image/{im.format.lower()}"
         if size > im.width and size > im.height:
             return send_file(cover_path, mimetype=mimetype)
 
-        cache_key = "{}-cover-{}".format(eid, size)
+        cache_key = f"{eid}-cover-{size}"
         try:
             return send_file(cache.get(cache_key), mimetype=mimetype)
         except CacheMiss:
@@ -447,7 +447,7 @@ def lyrics():
     unique = hashlib.md5(
         json.dumps([x.lower() for x in (artist, title)]).encode("utf-8")
     ).hexdigest()
-    cache_key = "lyrics-{}".format(unique)
+    cache_key = f"lyrics-{unique}"
 
     lyrics = {}
     try:
diff --git a/supysonic/api/unsupported.py b/supysonic/api/unsupported.py
index 3a8e310..a0607d8 100644
--- a/supysonic/api/unsupported.py
+++ b/supysonic/api/unsupported.py
@@ -24,9 +24,5 @@ def unsupported():
 
 
 for m in methods:
-    api.add_url_rule(
-        "/{}".format(m), "unsupported", unsupported, methods=["GET", "POST"]
-    )
-    api.add_url_rule(
-        "/{}.view".format(m), "unsupported", unsupported, methods=["GET", "POST"]
-    )
+    api.add_url_rule(f"/{m}", "unsupported", unsupported, methods=["GET", "POST"])
+    api.add_url_rule(f"/{m}.view", "unsupported", unsupported, methods=["GET", "POST"])
diff --git a/supysonic/cli.py b/supysonic/cli.py
index 2eacb5f..a586057 100644
--- a/supysonic/cli.py
+++ b/supysonic/cli.py
@@ -28,7 +28,7 @@ class TimedProgressDisplay:
 
     def __call__(self, name, scanned):
         if time.time() - self.__last_display > self.__interval:
-            progress = "Scanning '{}': {} files scanned".format(name, scanned)
+            progress = f"Scanning '{name}': {scanned} files scanned"
             self.__stdout.write("\b" * self.__last_len)
             self.__stdout.write(progress)
             self.__stdout.flush()
@@ -55,7 +55,7 @@ def folder_list():
 
     click.echo("Name\t\tPath\n----\t\t----")
     for f in Folder.select().where(Folder.root):
-        click.echo("{: <16}{}".format(f.name, f.path))
+        click.echo(f"{f.name: <16}{f.path}")
 
 
 @folder.command("add")
@@ -76,7 +76,7 @@ def folder_add(name, path):
 
     try:
         FolderManager.add(name, path)
-        click.echo("Folder '{}' added".format(name))
+        click.echo(f"Folder '{name}' added")
     except ValueError as e:
         raise ClickException(str(e)) from e
 
@@ -91,9 +91,9 @@ def folder_delete(name):
 
     try:
         FolderManager.delete_by_name(name)
-        click.echo("Deleted folder '{}'".format(name))
+        click.echo(f"Deleted folder '{name}'")
     except Folder.DoesNotExist as e:
-        raise ClickException("Folder '{}' does not exist.".format(name)) from e
+        raise ClickException(f"Folder '{name}' does not exist.") from e
 
 
 @folder.command("scan")
@@ -272,9 +272,9 @@ def user_delete(name):
 
     try:
         UserManager.delete_by_name(name)
-        click.echo("Deleted user '{}'".format(name))
+        click.echo(f"Deleted user '{name}'")
     except User.DoesNotExist as e:
-        raise ClickException("User '{}' does not exist.".format(name)) from e
+        raise ClickException(f"User '{name}' does not exist.") from e
 
 
 def _echo_role_change(username, name, value):
@@ -325,9 +325,9 @@ def user_changepass(name, password):
 
     try:
         UserManager.change_password2(name, password)
-        click.echo("Successfully changed '{}' password".format(name))
+        click.echo(f"Successfully changed '{name}' password")
     except User.DoesNotExist as e:
-        raise ClickException("User '{}' does not exist.".format(name)) from e
+        raise ClickException(f"User '{name}' does not exist.") from e
 
 
 @user.command("rename")
@@ -358,7 +358,7 @@ def user_rename(name, newname):
 
     user.name = newname
     user.save()
-    click.echo("User '{}' renamed to '{}'".format(name, newname))
+    click.echo(f"User '{name}' renamed to '{newname}'")
 
 
 def main():
diff --git a/supysonic/daemon/client.py b/supysonic/daemon/client.py
index 666a187..9ed5d45 100644
--- a/supysonic/daemon/client.py
+++ b/supysonic/daemon/client.py
@@ -138,7 +138,7 @@ class DaemonClient:
             return Client(address=self.__address, authkey=self.__key)
         except OSError:
             raise DaemonUnavailableError(
-                "Couldn't connect to daemon at {}".format(self.__address)
+                f"Couldn't connect to daemon at {self.__address}"
             )
 
     def add_watched_folder(self, folder):
diff --git a/supysonic/db.py b/supysonic/db.py
index 921fb73..29f7179 100644
--- a/supysonic/db.py
+++ b/supysonic/db.py
@@ -368,9 +368,9 @@ class Track(PathMixin, _Model):
         return mimetypes.guess_type(self.path, False)[0] or "application/octet-stream"
 
     def duration_str(self):
-        ret = "{:02}:{:02}".format((self.duration % 3600) / 60, self.duration % 60)
+        ret = f"{(self.duration % 3600) / 60:02}:{self.duration % 60:02}"
         if self.duration >= 3600:
-            ret = "{:02}:{}".format(self.duration / 3600, ret)
+            ret = f"{self.duration / 3600:02}:{ret}"
         return ret
 
     def suffix(self):
@@ -492,7 +492,7 @@ class Playlist(_Model):
             "id": str(self.id),
             "name": self.name
             if self.user.id == user.id
-            else "[{}] {}".format(self.user.name, self.name),
+            else f"[{self.user.name}] {self.name}",
             "owner": self.user.name,
             "public": self.public,
             "songCount": len(tracks),
@@ -536,7 +536,7 @@ class Playlist(_Model):
             tid = UUID(track)
 
         if self.tracks and len(self.tracks) > 0:
-            self.tracks = "{},{}".format(self.tracks, tid)
+            self.tracks = f"{self.tracks},{tid}"
         else:
             self.tracks = str(tid)
 
diff --git a/supysonic/frontend/__init__.py b/supysonic/frontend/__init__.py
index 205aabb..66c21a7 100644
--- a/supysonic/frontend/__init__.py
+++ b/supysonic/frontend/__init__.py
@@ -65,7 +65,7 @@ def scan_status():
             current_app.config["DAEMON"]["socket"]
         ).get_scanning_progress()
         if scanned is not None:
-            flash("Scanning in progress, {} files scanned.".format(scanned))
+            flash(f"Scanning in progress, {scanned} files scanned.")
     except DaemonUnavailableError:
         pass
 
diff --git a/supysonic/frontend/playlist.py b/supysonic/frontend/playlist.py
index 2c1f4f9..2dcedfd 100644
--- a/supysonic/frontend/playlist.py
+++ b/supysonic/frontend/playlist.py
@@ -56,9 +56,7 @@ def playlist_export(uid, playlist):
     return Response(
         render_template("playlist_export.m3u", playlist=playlist),
         mimetype="audio/mpegurl",
-        headers={
-            "Content-disposition": "attachment; filename={}.m3u".format(playlist.name)
-        },
+        headers={"Content-disposition": f"attachment; filename={playlist.name}.m3u"},
     )
 
 
diff --git a/supysonic/managers/folder.py b/supysonic/managers/folder.py
index b4bc76a..943149a 100644
--- a/supysonic/managers/folder.py
+++ b/supysonic/managers/folder.py
@@ -26,7 +26,7 @@ class FolderManager:
     def add(name, path):
         try:
             Folder.get(name=name, root=True)
-            raise ValueError("Folder '{}' exists".format(name))
+            raise ValueError(f"Folder '{name}' exists")
         except Folder.DoesNotExist:
             pass
 
diff --git a/supysonic/managers/user.py b/supysonic/managers/user.py
index 1a59e70..fb16fee 100644
--- a/supysonic/managers/user.py
+++ b/supysonic/managers/user.py
@@ -29,7 +29,7 @@ class UserManager:
     @staticmethod
     def add(name, password, **kwargs):
         if User.select().where(User.name == name).exists():
-            raise ValueError("User '{}' exists".format(name))
+            raise ValueError(f"User '{name}' exists")
 
         crypt, salt = UserManager.__encrypt_password(password)
         return User.create(name=name, password=crypt, salt=salt, **kwargs)
diff --git a/supysonic/server/__init__.py b/supysonic/server/__init__.py
index 4acc6b4..4e156fb 100644
--- a/supysonic/server/__init__.py
+++ b/supysonic/server/__init__.py
@@ -109,15 +109,13 @@ def main(server, host, port, socket, processes, threads):
         server = find_first_available_server()
         if server is None:
             raise ClickException(
-                "Couldn't load any server, please install one of {}".format(_servers)
+                f"Couldn't load any server, please install one of {_servers}"
             )
     else:
         try:
             server = get_server(server)
         except ImportError:
-            raise ClickException(
-                "Couldn't load {}, please install it first".format(server)
-            )
+            raise ClickException(f"Couldn't load {server}, please install it first")
 
     if socket is not None:
         host = None
diff --git a/supysonic/server/gunicorn.py b/supysonic/server/gunicorn.py
index 3e6613d..9e6dfd3 100644
--- a/supysonic/server/gunicorn.py
+++ b/supysonic/server/gunicorn.py
@@ -28,9 +28,9 @@ class GunicornApp(BaseApplication):
         threads = self.__config["threads"]
 
         if socket is not None:
-            self.cfg.set("bind", "unix:{}".format(socket))
+            self.cfg.set("bind", f"unix:{socket}")
         else:
-            self.cfg.set("bind", "{}:{}".format(host, port))
+            self.cfg.set("bind", f"{host}:{port}")
 
         if processes is not None:
             self.cfg.set("workers", processes)
diff --git a/tests/api/apitestbase.py b/tests/api/apitestbase.py
index 7cca930..e662625 100644
--- a/tests/api/apitestbase.py
+++ b/tests/api/apitestbase.py
@@ -23,9 +23,7 @@ class ApiTestBase(TestBase):
     def setUp(self, apiVersion="1.12.0"):
         super().setUp()
         self.apiVersion = apiVersion
-        xsd = etree.parse(
-            "tests/assets/subsonic-rest-api-{}.xsd".format(self.apiVersion)
-        )
+        xsd = etree.parse(f"tests/assets/subsonic-rest-api-{self.apiVersion}.xsd")
         self.schema = etree.XMLSchema(xsd)
 
     def _find(self, xml, path):
@@ -33,7 +31,7 @@ class ApiTestBase(TestBase):
         Helper method that insert the namespace in ElementPath 'path'
         """
 
-        path = path_replace_regexp.sub(r"/{{{}}}\1".format(NS), path)
+        path = path_replace_regexp.sub(rf"/{{{NS}}}\1", path)
         return xml.find(path)
 
     def _xpath(self, elem, path):
@@ -70,7 +68,7 @@ class ApiTestBase(TestBase):
         if "u" not in args:
             args.update({"u": "alice", "p": "Alic3"})
 
-        uri = "/rest/{}.view".format(endpoint)
+        uri = f"/rest/{endpoint}.view"
         rg = self.client.get(uri, query_string=args)
         if not skip_post:
             rp = self.client.post(uri, data=args)
@@ -82,13 +80,13 @@ class ApiTestBase(TestBase):
         if xml.get("status") == "ok":
             self.assertIsNone(error)
             if tag:
-                self.assertEqual(xml[0].tag, "{{{}}}{}".format(NS, tag))
+                self.assertEqual(xml[0].tag, f"{{{NS}}}{tag}")
                 return rg, xml[0]
             else:
                 self.assertEqual(len(xml), 0)
                 return rg, None
         else:
             self.assertIsNone(tag)
-            self.assertEqual(xml[0].tag, "{{{}}}error".format(NS))
+            self.assertEqual(xml[0].tag, f"{{{NS}}}error")
             self.assertEqual(xml[0].get("code"), str(error))
             return rg
diff --git a/tests/api/test_api_setup.py b/tests/api/test_api_setup.py
index a7b8577..f4bd3ee 100644
--- a/tests/api/test_api_setup.py
+++ b/tests/api/test_api_setup.py
@@ -24,7 +24,7 @@ class ApiSetupTestCase(TestBase):
         self._patch_client()
 
     def __basic_auth_get(self, username, password):
-        hashed = base64.b64encode("{}:{}".format(username, password).encode("utf-8"))
+        hashed = base64.b64encode(f"{username}:{password}".encode("utf-8"))
         headers = {"Authorization": "Basic " + hashed.decode("utf-8")}
         return self.client.get(
             "/rest/ping.view", headers=headers, query_string={"c": "tests"}
diff --git a/tests/api/test_browse.py b/tests/api/test_browse.py
index 73579e3..0de3dfb 100644
--- a/tests/api/test_browse.py
+++ b/tests/api/test_browse.py
@@ -24,7 +24,7 @@ class BrowseTestCase(ApiTestBase):
         for letter in "ABC":
             folder = Folder.create(
                 name=letter + "rtist",
-                path="tests/assets/{}rtist".format(letter),
+                path=f"tests/assets/{letter}rtist",
                 root=False,
                 parent=self.root,
             )
diff --git a/tests/api/test_media.py b/tests/api/test_media.py
index 4272e5b..ee28e82 100644
--- a/tests/api/test_media.py
+++ b/tests/api/test_media.py
@@ -57,9 +57,7 @@ class MediaTestCase(ApiTestBase):
                 disc=1,
                 artist=artist,
                 album=album,
-                path=os.path.abspath(
-                    "tests/assets/formats/silence.{}".format(self.formats[i])
-                ),
+                path=os.path.abspath(f"tests/assets/formats/silence.{self.formats[i]}"),
                 root_folder=folder,
                 folder=folder,
                 duration=2,
diff --git a/tests/api/test_radio.py b/tests/api/test_radio.py
index 277da55..741baec 100644
--- a/tests/api/test_radio.py
+++ b/tests/api/test_radio.py
@@ -178,9 +178,9 @@ class RadioStationTestCase(ApiTestBase):
         test_range = 3
         for x in range(test_range):
             RadioStation.create(
-                stream_url="http://example.com/radio-{}".format(x),
-                name="Radio {}".format(x),
-                homepage_url="http://example.com/update-{}".format(x),
+                stream_url=f"http://example.com/radio-{x}",
+                name=f"Radio {x}",
+                homepage_url=f"http://example.com/update-{x}",
             )
 
         # verify happy path is clean
@@ -193,9 +193,9 @@ class RadioStationTestCase(ApiTestBase):
         # Test data is sequential by design.
         for x in range(test_range):
             station = child[x]
-            self.assertTrue(station.get("streamUrl").endswith("radio-{}".format(x)))
-            self.assertTrue(station.get("name").endswith("Radio {}".format(x)))
-            self.assertTrue(station.get("homePageUrl").endswith("update-{}".format(x)))
+            self.assertTrue(station.get("streamUrl").endswith(f"radio-{x}"))
+            self.assertTrue(station.get("name").endswith(f"Radio {x}"))
+            self.assertTrue(station.get("homePageUrl").endswith(f"update-{x}"))
 
         # test for non-admin access
         rv, child = self._make_request(
diff --git a/tests/api/test_search.py b/tests/api/test_search.py
index 3aa71e8..6c9167a 100644
--- a/tests/api/test_search.py
+++ b/tests/api/test_search.py
@@ -23,7 +23,7 @@ class SearchTestCase(ApiTestBase):
         for letter in "ABC":
             folder = Folder.create(
                 name=letter + "rtist",
-                path="tests/assets/{}rtist".format(letter),
+                path=f"tests/assets/{letter}rtist",
                 root=False,
                 parent=root,
             )
diff --git a/tests/api/test_transcoding.py b/tests/api/test_transcoding.py
index 7df3724..79e75b0 100644
--- a/tests/api/test_transcoding.py
+++ b/tests/api/test_transcoding.py
@@ -81,7 +81,7 @@ class TranscodingTestCase(ApiTestBase):
         rv.response.close()
         rv.close()
 
-        key = "{}-96.rnd".format(self.trackid)
+        key = f"{self.trackid}-96.rnd"
         with self.app_context():
             self.assertTrue(current_app.transcode_cache.has(key))
             self.assertEqual(current_app.transcode_cache.size, 52000)
@@ -98,7 +98,7 @@ class TranscodingTestCase(ApiTestBase):
         rv.response.close()
         rv.close()
 
-        key = "{}-96.rnd".format(self.trackid)
+        key = f"{self.trackid}-96.rnd"
         with self.app_context():
             self.assertFalse(current_app.transcode_cache.has(key))
             self.assertEqual(current_app.transcode_cache.size, 0)
@@ -118,7 +118,7 @@ class TranscodingTestCase(ApiTestBase):
         rv.response.close()
         rv.close()
 
-        key = "{}-96.rnd".format(self.trackid)
+        key = f"{self.trackid}-96.rnd"
         with self.app_context():
             self.assertTrue(current_app.transcode_cache.has(key))
             self.assertEqual(current_app.transcode_cache.size, 52000)
diff --git a/tests/base/test_cli.py b/tests/base/test_cli.py
index 27dfbff..652117e 100644
--- a/tests/base/test_cli.py
+++ b/tests/base/test_cli.py
@@ -41,7 +41,7 @@ class CLITestCase(unittest.TestCase):
         return rv
 
     def __add_folder(self, name, path, expect_fail=False):
-        self.__invoke("folder add {} {}".format(name, shlex.quote(path)), expect_fail)
+        self.__invoke(f"folder add {name} {shlex.quote(path)}", expect_fail)
 
     def test_folder_add(self):
         with tempfile.TemporaryDirectory() as d:
diff --git a/tests/frontend/test_user.py b/tests/frontend/test_user.py
index 8009a0e..c1723cd 100644
--- a/tests/frontend/test_user.py
+++ b/tests/frontend/test_user.py
@@ -86,7 +86,7 @@ class UserTestCase(FrontendTestBase):
         rv = self.client.get("/user/whatever/changeusername", follow_redirects=True)
         self.assertIn("badly formed", rv.data)
         rv = self.client.get(
-            "/user/{}/changeusername".format(uuid.uuid4()), follow_redirects=True
+            f"/user/{uuid.uuid4()}/changeusername", follow_redirects=True
         )
         self.assertIn("No such user", rv.data)
         self.client.get("/user/{}/changeusername".format(self.users["bob"]))
@@ -96,7 +96,7 @@ class UserTestCase(FrontendTestBase):
         rv = self.client.post("/user/whatever/changeusername", follow_redirects=True)
         self.assertIn("badly formed", rv.data)
         rv = self.client.post(
-            "/user/{}/changeusername".format(uuid.uuid4()), follow_redirects=True
+            f"/user/{uuid.uuid4()}/changeusername", follow_redirects=True
         )
         self.assertIn("No such user", rv.data)
 
diff --git a/tests/issue221.py b/tests/issue221.py
index a895e03..570eaa6 100644
--- a/tests/issue221.py
+++ b/tests/issue221.py
@@ -19,7 +19,7 @@ class Issue221TestCase(unittest.TestCase):
 
         for i in range(3):
             db.Track.create(
-                title="Track {}".format(i),
+                title=f"Track {i}",
                 album=album,
                 artist=artist,
                 disc=1,
@@ -27,7 +27,7 @@ class Issue221TestCase(unittest.TestCase):
                 duration=3,
                 has_art=False,
                 bitrate=64,
-                path="tests/track{}".format(i),
+                path=f"tests/track{i}",
                 last_modification=2,
                 root_folder=root,
                 folder=root,