diff -r 57875cf423c9 -r 2372284d9457 contrib/benchmarks/revset.py
--- a/contrib/benchmarks/revset.py	Sat Oct 05 10:29:34 2019 -0400
+++ b/contrib/benchmarks/revset.py	Sun Oct 06 09:45:02 2019 -0400
@@ -18,15 +18,16 @@
 
 from . import basedir, perfbench
 
+
 def createrevsetbenchmark(baseset, variants=None):
     if variants is None:
         # Default variants
-        variants = ["plain", "first", "last", "sort", "sort+first",
-                    "sort+last"]
-    fname = "track_" + "_".join("".join([
-        c if c in string.digits + string.letters else " "
-        for c in baseset
-    ]).split())
+        variants = ["plain", "first", "last", "sort", "sort+first", "sort+last"]
+    fname = "track_" + "_".join(
+        "".join(
+            [c if c in string.digits + string.letters else " " for c in baseset]
+        ).split()
+    )
 
     def wrap(fname, baseset):
         @perfbench(name=baseset, params=[("variant", variants)])
@@ -36,18 +37,21 @@
                 for var in variant.split("+"):
                     revset = "%s(%s)" % (var, revset)
             return perf("perfrevset", revset)
+
         f.__name__ = fname
         return f
+
     return wrap(fname, baseset)
 
+
 def initializerevsetbenchmarks():
     mod = sys.modules[__name__]
-    with open(os.path.join(basedir, 'contrib', 'base-revsets.txt'),
-              'rb') as fh:
+    with open(os.path.join(basedir, 'contrib', 'base-revsets.txt'), 'rb') as fh:
         for line in fh:
             baseset = line.strip()
             if baseset and not baseset.startswith('#'):
                 func = createrevsetbenchmark(baseset)
                 setattr(mod, func.__name__, func)
 
+
 initializerevsetbenchmarks()