Format with black

Author: tony

libtmux/window.py

@@ -382,8 +382,13 @@ def last_pane(self):
         return self.select_pane('-l')
 
     def split_window(
-        self, target=None, start_directory=None, attach=True, vertical=True,
-        shell=None, percent=None
+        self,
+        target=None,
+        start_directory=None,
+        attach=True,
+        vertical=True,
+        shell=None,
+        percent=None,
     ):
         """
         Split window and return the created :class:`Pane`.