Upgrade Python syntax with pyupgrade --py36-plus

Author: hugovk

livereload/server.py

@@ -240,7 +240,7 @@ def alert():
         if isinstance(func, str):
             cmd = func
             func = shell(func)
-            func.name = "shell: {}".format(cmd)
+            func.name = f"shell: {cmd}"
 
         self.watcher.watch(filepath, func, delay, ignore=ignore)
 
@@ -330,7 +330,7 @@ def serve(self, port=5500, liveport=None, host=None, root=None, debug=None,
             self.root = root
 
         self._setup_logging()
-        logger.info('Serving on http://{}:{}'.format(host, port))
+        logger.info(f'Serving on http://{host}:{port}')
 
         self.default_filename = default_filename
 
@@ -344,7 +344,7 @@ def serve(self, port=5500, liveport=None, host=None, root=None, debug=None,
 
             def opener():
                 time.sleep(open_url_delay)
-                webbrowser.open('http://{}:{}'.format(host, port))
+                webbrowser.open(f'http://{host}:{port}')
             threading.Thread(target=opener).start()
 
         try:

livereload/watcher.py

@@ -107,7 +107,7 @@ def examine(self):
                     if not name:
                         name = getattr(func, '__name__', 'anonymous')
                     logger.info(
-                        "Running task: {} (delay: {})".format(name, delay))
+                        f"Running task: {name} (delay: {delay})")
                     if sys.version_info.major < 3:
                         sig_len = len(inspect.getargspec(func)[0])
                     else: