diff --git a/src/PIL/ImageGrab.py b/src/PIL/ImageGrab.py
index c23b40295..44bc6d38f 100644
--- a/src/PIL/ImageGrab.py
+++ b/src/PIL/ImageGrab.py
@@ -146,18 +146,27 @@ def grabclipboard():
             except subprocess.CalledProcessError:
                 loginctl = None
         else:
-            loginctl =  None
+            loginctl = None
 
         if loginctl is not None:
             username = subprocess.check_output("whoami").decode().strip("\n")
-            sessionid = [line.split()[0] for line in loginctl if username in line.split()][0]
-            sessiontype = subprocess.check_output(
-                ["loginctl", "show-session", sessionid, "-p", "Type"]
-                ).decode().strip("\n").split("=")[1]
-        else: # Session type check failed
+            sessionid = [
+                line.split()[0] for line in loginctl if username in line.split()
+            ][0]
+            sessiontype = (
+                subprocess.check_output(
+                    ["loginctl", "show-session", sessionid, "-p", "Type"]
+                )
+                .decode()
+                .strip("\n")
+                .split("=")[1]
+            )
+        else:  # Session type check failed
             sessiontype = None
 
-        if shutil.which("wl-paste") and ((sessiontype == "wayland") or (sessiontype is None)):
+        if shutil.which("wl-paste") and (
+            (sessiontype == "wayland") or (sessiontype is None)
+        ):
             output = subprocess.check_output(["wl-paste", "-l"]).decode()
             mimetypes = output.splitlines()
             if "image/png" in mimetypes:
@@ -170,7 +179,9 @@ def grabclipboard():
             args = ["wl-paste"]
             if mimetype:
                 args.extend(["-t", mimetype])
-        elif shutil.which("xclip") and ((sessiontype == "x11") or (sessiontype is None)):
+        elif shutil.which("xclip") and (
+            (sessiontype == "x11") or (sessiontype is None)
+        ):
             args = ["xclip", "-selection", "clipboard", "-t", "image/png", "-o"]
         else:
             msg = "wl-paste or xclip is required for ImageGrab.grabclipboard() on Linux"