message: Py_test and py_binary placeholders to set python_version attribute later.
diff: @@ -1971,6 +1971,7 @@ def tf_py_wrap_cc(
  # //third_party/tensorflow/tools/pip_package:win_pip_package_marker for specific reasons.
  # 2. When --define=no_tensorflow_py_deps=false (by default), it's a normal py_test.
  def py_test(deps = [], data = [], kernels = [], **kwargs):
  + # Python version placeholder
  native.py_test(
  # TODO(jlebar): Ideally we'd use tcmalloc here.,
  deps = select({
  @@ -1999,6 +2000,8 @@ def py_binary(name, deps = [], **kwargs):
  name = name + "_deps",
  deps = deps,
  )
  +
  + # Python version placeholder
  native.py_binary(
  name = name,
  deps = select({
  