--- a/contrib/showstack.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/contrib/showstack.py	Sun Oct 06 09:45:02 2019 -0400
@@ -9,16 +9,19 @@
 import sys
 import traceback
 
+
 def sigshow(*args):
     sys.stderr.write("\n")
     traceback.print_stack(args[1], limit=10, file=sys.stderr)
     sys.stderr.write("----\n")
 
+
 def sigexit(*args):
     sigshow(*args)
     print('alarm!')
     sys.exit(1)
 
+
 def extsetup(ui):
     signal.signal(signal.SIGQUIT, sigshow)
     signal.signal(signal.SIGALRM, sigexit)