setup docs, bzl_library, minor cleanup

Author: rickeylev

docs/BUILD.bazel

@@ -102,6 +102,7 @@ sphinx_stardocs(
         "//python/private:py_library_rule_bzl",
         "//python/private:py_runtime_rule_bzl",
         "//python/private:py_test_rule_bzl",
+        "//python/private:rule_builders_bzl",
         "//python/private/api:py_common_api_bzl",
         "//python/private/pypi:config_settings_bzl",
         "//python/private/pypi:pkg_aliases_bzl",

python/private/BUILD.bazel

@@ -92,6 +92,15 @@ bzl_library(
     ],
 )
 
+bzl_library(
+    name = "rule_builders_bzl",
+    srcs = ["rule_builders.bzl"],
+    deps = [
+        ":builders_bzl",
+        "@bazel_skylib//lib:types",
+    ],
+)
+
 bzl_library(
     name = "bzlmod_enabled_bzl",
     srcs = ["bzlmod_enabled.bzl"],
@@ -283,6 +292,7 @@ bzl_library(
     deps = [
         ":attributes_bzl",
         ":py_executable_bzl",
+        ":rule_builders_bzl",
         ":semantics_bzl",
         "@bazel_skylib//lib:dicts",
     ],
@@ -410,6 +420,7 @@ bzl_library(
         ":flags_bzl",
         ":py_cc_link_params_info_bzl",
         ":py_internal_bzl",
+        ":rule_builders_bzl",
         ":toolchain_types_bzl",
         "@bazel_skylib//lib:dicts",
         "@bazel_skylib//rules:common_settings",
@@ -475,6 +486,7 @@ bzl_library(
         ":py_internal_bzl",
         ":py_runtime_info_bzl",
         ":reexports_bzl",
+        ":rule_builders_bzl",
         ":util_bzl",
         "@bazel_skylib//lib:dicts",
         "@bazel_skylib//lib:paths",
@@ -515,6 +527,7 @@ bzl_library(
         ":attributes_bzl",
         ":common_bzl",
         ":py_executable_bzl",
+        ":rule_builders_bzl",
         ":semantics_bzl",
         "@bazel_skylib//lib:dicts",
     ],

python/private/py_executable.bzl

@@ -1760,7 +1760,7 @@ def create_executable_rule_builder(implementation, **kwargs):
             TOOLCHAIN_TYPE,
             config_common.toolchain_type(EXEC_TOOLS_TOOLCHAIN_TYPE, mandatory = False),
         ] + _CC_TOOLCHAINS,
-        cfg = rule_builders.RuleCfgBuilder(
+        cfg = dict(
             implementation = _transition_executable_impl,
             inputs = [_PYTHON_VERSION_FLAG],
             outputs = [_PYTHON_VERSION_FLAG],