diff --git a/ttkHyperlinkLabel.py b/ttkHyperlinkLabel.py
index 8dd08644..5a13a5fc 100644
--- a/ttkHyperlinkLabel.py
+++ b/ttkHyperlinkLabel.py
@@ -1,7 +1,23 @@
+"""
+A clickable ttk label for HTTP links.
+
+In addition to standard ttk.Label arguments, takes the following arguments:
+  url: The URL as a string that the user will be sent to on clicking on
+  non-empty label text. If url is a function it will be called on click with
+  the current label text and should return the URL as a string.
+  underline: If True/False the text is always/never underlined. If None (the
+  default) the text is underlined only on hover.
+  popup_copy: Whether right-click on non-empty label text pops up a context
+  menu with a 'Copy' option. Defaults to no context menu. If popup_copy is a
+  function it will be called with the current label text and should return a
+  boolean.
+
+May be imported by plugins
+"""
 import sys
 import tkinter as tk
 import webbrowser
-from tkinter import font as tkFont
+from tkinter import font as tk_font
 from tkinter import ttk
 
 if sys.platform == 'win32':
@@ -10,15 +26,10 @@ if sys.platform == 'win32':
 
 # A clickable ttk Label
 #
-# In addition to standard ttk.Label arguments, takes the following arguments:
-#   url: The URL as a string that the user will be sent to on clicking on non-empty label text. If url is a function it will be called on click with the current label text and should return the URL as a string.
-#   underline: If True/False the text is always/never underlined. If None (the default) the text is underlined only on hover.
-#   popup_copy: Whether right-click on non-empty label text pops up a context menu with a 'Copy' option. Defaults to no context menu. If popup_copy is a function it will be called with the current label text and should return a boolean.
-#
-# May be imported by plugins
 
 
 class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object):
+    """Clickable label for HTTP links."""
 
     def __init__(self, master=None, **kw):
         self.url = 'url' in kw and kw.pop('url') or None
@@ -51,8 +62,8 @@ class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object)
                        text=kw.get('text'),
                        font=kw.get('font', ttk.Style().lookup('TLabel', 'font')))
 
-    # Change cursor and appearance depending on state and text
-    def configure(self, cnf=None, **kw):
+    def configure(self, cnf=None, **kw):  # noqa: CCR001
+        """Change cursor and appearance depending on state and text."""
         # This class' state
         for thing in ['url', 'popup_copy', 'underline']:
             if thing in kw:
@@ -71,7 +82,7 @@ class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object)
 
         if 'font' in kw:
             self.font_n = kw['font']
-            self.font_u = tkFont.Font(font=self.font_n)
+            self.font_u = tk_font.Font(font=self.font_n)
             self.font_u.configure(underline=True)
             kw['font'] = self.underline is True and self.font_u or self.font_n
 
@@ -86,7 +97,13 @@ class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object)
 
         super(HyperlinkLabel, self).configure(cnf, **kw)
 
-    def __setitem__(self, key, value):
+    def __setitem__(self, key, value) -> None:
+        """
+        Allow for dict member style setting of options.
+
+        :param key: option name
+        :param value: option value
+        """
         self.configure(None, **{key: value})
 
     def _enter(self, event):
@@ -108,17 +125,23 @@ class HyperlinkLabel(sys.platform == 'darwin' and tk.Label or ttk.Label, object)
         if self['text'] and (self.popup_copy(self['text']) if callable(self.popup_copy) else self.popup_copy):
             self.menu.post(sys.platform == 'darwin' and event.x_root + 1 or event.x_root, event.y_root)
 
-    def copy(self):
+    def copy(self) -> None:
+        """Copy the current text to the clipboard."""
         self.clipboard_clear()
         self.clipboard_append(self['text'])
 
 
-def openurl(url):
+def openurl(url) -> None:  # noqa: CCR001
+    """
+    Open the given URL in appropriate browser.
+
+    :param url: URL to open.
+    """
     if sys.platform == 'win32':
+        # FIXME: Is still still true with supported Windows 10 and 11 ?
         # On Windows webbrowser.open calls os.startfile which calls ShellExecute which can't handle long arguments,
         # so discover and launch the browser directly.
         # https://blogs.msdn.microsoft.com/oldnewthing/20031210-00/?p=41553
-
         try:
             hkey = OpenKeyEx(HKEY_CURRENT_USER,
                              r'Software\Microsoft\Windows\Shell\Associations\UrlAssociations\https\UserChoice')
@@ -128,23 +151,28 @@ def openurl(url):
                 # IE and Edge can't handle long arguments so just use webbrowser.open and hope
                 # https://blogs.msdn.microsoft.com/ieinternals/2014/08/13/url-length-limits/
                 cls = None
+
             else:
                 cls = value
-        except:
+
+        except Exception:
             cls = 'https'
 
         if cls:
             try:
-                hkey = OpenKeyEx(HKEY_CLASSES_ROOT, r'%s\shell\open\command' % cls)
+                hkey = OpenKeyEx(HKEY_CLASSES_ROOT, rf'{cls}\shell\open\command')
                 (value, typ) = QueryValueEx(hkey, None)
                 CloseKey(hkey)
                 if 'iexplore' not in value.lower():
                     if '%1' in value:
-                        subprocess.Popen(buf.value.replace('%1', url))
+                        subprocess.Popen(value.replace('%1', url))
+
                     else:
-                        subprocess.Popen('%s "%s"' % (buf.value, url))
+                        subprocess.Popen(f'{value} "{url}"')
+
                     return
-            except:
+
+            except Exception:
                 pass
 
     webbrowser.open(url)