Index: Lib/trace.py
===================================================================
--- Lib/trace.py	(revision 62268)
+++ Lib/trace.py	(working copy)
@@ -249,8 +249,7 @@
         if self.calledfuncs:
             print()
             print("functions called:")
-            calls = self.calledfuncs.keys()
-            calls.sort()
+            calls = sorted(self.calledfuncs.keys())
             for filename, modulename, funcname in calls:
                 print(("filename: %s, modulename: %s, funcname: %s"
                        % (filename, modulename, funcname)))
@@ -258,8 +257,7 @@
         if self.callers:
             print()
             print("calling relationships:")
-            calls = self.callers.keys()
-            calls.sort()
+            calls = sorted(self.callers.keys())
             lastfile = lastcfile = ""
             for ((pfile, pmod, pfunc), (cfile, cmod, cfunc)) in calls:
                 if pfile != lastfile:
@@ -318,8 +316,7 @@
                 sums[modulename] = n_lines, percent, modulename, filename
 
         if summary and sums:
-            mods = sums.keys()
-            mods.sort()
+            mods = sorted(sums.keys())
             print("lines   cov%   module   (path)")
             for m in mods:
                 n_lines, percent, modulename, filename = sums[m]