fix profiling again

Author: pipermerriam

ethereum/tests/profile_vm.py

@@ -3,7 +3,7 @@
 import ethereum.testutils as testutils
 import cProfile
 import pstats
-from io import StringIO
+from io import BytesIO
 import time
 from rlp.utils import encode_hex
 from ethereum.utils import sha3, to_string
@@ -39,7 +39,7 @@ def run(profiler=None):
     if len(sys.argv) == 1:
         pr = cProfile.Profile()
         run(pr)
-        s = StringIO()
+        s = BytesIO()
         sortby = 'tottime'
         ps = pstats.Stats(pr, stream=s).sort_stats(sortby)
         ps.print_stats(50)