[bazel] Switch to rules_python for python rules

WORKSPACE

@@ -51,3 +51,20 @@ npm_install(
 load("@npm//:install_bazel_dependencies.bzl", "install_bazel_dependencies")
 
 install_bazel_dependencies()
+
+load("@bazel_tools//tools/build_defs/repo:git.bzl", "git_repository")
+
+git_repository(
+    name = "rules_python",
+    remote = "https://github.com/bazelbuild/rules_python.git",
+    commit = "4b84ad270387a7c439ebdccfd530e2339601ef27",
+    shallow_since = "1564776078 -0400"
+)
+
+# This call should always be present.
+load("@rules_python//python:repositories.bzl", "py_repositories")
+py_repositories()
+
+# This one is only needed if you're using the packaging rules.
+load("@rules_python//python:pip.bzl", "pip_repositories")
+pip_repositories()

py/BUILD.bazel

@@ -1,3 +1,5 @@
+load("@rules_python//python:defs.bzl", "py_binary", "py_library", "py_test")
+
 genrule(
     name = "get-attribute",
     srcs = ["//javascript/webdriver/atoms:get-attribute.js"],
@@ -34,4 +36,4 @@ py_test(
         ":main",
     ],
     legacy_create_init = False,
-)
+)

third_party/py/BUILD.bazel

@@ -0,0 +1 @@
+