message: fix code compare
diff: @@ -168,7 +168,7 @@ def prepare(account, src, abi, full_src_path, code_type = None):
  except Exception as e:
  print(e)
  return
  - if old_code:
  + if old_code and vm_type == CODE_TYPE_PY:
  try:
  old_co = marshal.loads(old_code)
  if compare_code_object(old_co, co):
  