fix linter issues

src/liburlparser/core.py

@@ -4,21 +4,26 @@
 import warnings
 from pathlib import Path
 
-
 from ._core import Host, Psl, Url, __doc__, __version__
 
-psl = Psl() # psl
+psl = Psl()  # psl
+
 
 def warning_on_one_line(message, category, filename, lineno, file=None, line=None):
     return f'{filename}:{lineno}: {category.__name__}: {message}\n'
+
+
 warnings.formatwarning = warning_on_one_line
 
 try:
     import requests
+
     def psl_update():
         resp = requests.get(psl.url)
         psl.load_from_string(resp.text)
+
     psl.update = psl_update
+
 except ImportError:
     pass
 
@@ -27,6 +32,6 @@ def psl_update():
     if psl_filename.exists():
         psl.load_from_path(psl_filename.as_posix())
     else:
-        warnings.warn("Cannot find Public_suffix_list.dat. you must import it with \"psl.load_from_path\" or \"psl.load_from_string\" or \"psl.update\" functions",
-                      RuntimeWarning, stacklevel=2)
-
+        warnings.warn(
+            "Cannot find Public_suffix_list.dat. you must import it with \"psl.load_from_path\" or \"psl.load_from_string\" or \"psl.update\" functions",
+            RuntimeWarning, stacklevel=2)