Index: utils/perf-training/perf-helper.py
===================================================================
--- utils/perf-training/perf-helper.py
+++ utils/perf-training/perf-helper.py
@@ -114,7 +114,7 @@
   # Find the cc1 command used by the compiler. To do this we execute the
   # compiler with '-###' to figure out what it wants to do.
   cmd = cmd + ['-###']
-  cc_output = subprocess.check_output(cmd, stderr=subprocess.STDOUT, env=env).strip()
+  cc_output = subprocess.check_output(cmd, stderr=subprocess.STDOUT, env=env, universal_newlines=True).strip()
   cc_commands = []
   for ln in cc_output.split('\n'):
       # Filter out known garbage.
@@ -296,7 +296,7 @@
       counts[a] = counts.get(a,0) + 1
 
   by_count = counts.items()
-  by_count.sort(key = lambda (_,n): -n)
+  by_count.sort(key = lambda _,n: -n)
   return [s for s,n in by_count]
  
 def form_by_random(symbol_lists):
@@ -340,7 +340,7 @@
   # If the user gave us a binary, get all the symbols in the binary by
   # snarfing 'nm' output.
   if opts.binary_path is not None:
-     output = subprocess.check_output(['nm', '-P', opts.binary_path])
+     output = subprocess.check_output(['nm', '-P', opts.binary_path], universal_newlines=True)
      lines = output.split("\n")
      all_symbols = [ln.split(' ',1)[0]
                     for ln in lines