diff -r 9cc55b743713 -r 57875cf423c9 mercurial/pushkey.py
--- a/mercurial/pushkey.py	Fri Oct 04 15:53:45 2019 -0400
+++ b/mercurial/pushkey.py	Sat Oct 05 10:29:34 2019 -0400
@@ -14,6 +14,7 @@
     phases,
 )
 
+
 def _nslist(repo):
     n = {}
     for k in _namespaces:
@@ -22,36 +23,45 @@
         n.pop('obsolete')
     return n
 
-_namespaces = {"namespaces": (lambda *x: False, _nslist),
-               "bookmarks": (bookmarks.pushbookmark, bookmarks.listbookmarks),
-               "phases": (phases.pushphase, phases.listphases),
-               "obsolete": (obsolete.pushmarker, obsolete.listmarkers),
-              }
+
+_namespaces = {
+    "namespaces": (lambda *x: False, _nslist),
+    "bookmarks": (bookmarks.pushbookmark, bookmarks.listbookmarks),
+    "phases": (phases.pushphase, phases.listphases),
+    "obsolete": (obsolete.pushmarker, obsolete.listmarkers),
+}
+
 
 def register(namespace, pushkey, listkeys):
     _namespaces[namespace] = (pushkey, listkeys)
 
+
 def _get(namespace):
     return _namespaces.get(namespace, (lambda *x: False, lambda *x: {}))
 
+
 def push(repo, namespace, key, old, new):
     '''should succeed iff value was old'''
     pk = _get(namespace)[0]
     return pk(repo, key, old, new)
 
+
 def list(repo, namespace):
     '''return a dict'''
     lk = _get(namespace)[1]
     return lk(repo)
 
+
 encode = encoding.fromlocal
 
 decode = encoding.tolocal
 
+
 def encodekeys(keys):
     """encode the content of a pushkey namespace for exchange over the wire"""
     return '\n'.join(['%s\t%s' % (encode(k), encode(v)) for k, v in keys])
 
+
 def decodekeys(data):
     """decode the content of a pushkey namespace from exchange over the wire"""
     result = {}