--- a/mercurial/statprof.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/statprof.py	Mon Feb 21 13:08:28 2022 -0700
@@ -154,7 +154,7 @@
 ## Collection data structures
 
 
-class ProfileState(object):
+class ProfileState:
     def __init__(self, frequency=None):
         self.reset(frequency)
         self.track = b'cpu'
@@ -202,7 +202,7 @@
 state = ProfileState()
 
 
-class CodeSite(object):
+class CodeSite:
     cache = {}
 
     __slots__ = ('path', 'lineno', 'function', 'source')
@@ -260,7 +260,7 @@
         return '%s:%s' % (self.filename(), self.function)
 
 
-class Sample(object):
+class Sample:
     __slots__ = ('stack', 'time')
 
     def __init__(self, stack, time):
@@ -434,7 +434,7 @@
 ## Reporting API
 
 
-class SiteStats(object):
+class SiteStats:
     def __init__(self, site):
         self.site = site
         self.selfcount = 0
@@ -708,7 +708,7 @@
 
 
 def display_hotpath(data, fp, limit=0.05, **kwargs):
-    class HotNode(object):
+    class HotNode:
         def __init__(self, site):
             self.site = site
             self.count = 0