Breaking Change: Removed obsolete/duplicate setup.py from Python.

python/README.md

@@ -2,6 +2,11 @@
 
 This directory contains the Protobuf library for Python.
 
+For user documentation about how to use Protobuf Python, see
+https://protobuf.dev/getting-started/pythontutorial/
+
+# Installation
+
 In most cases you should install the library using `pip` or another package
 manager:
 
@@ -12,10 +17,7 @@ $ pip install protobuf
 The packages released on https://pypi.org/project/protobuf/#files include both a
 source distribution and binary wheels.
 
-For user documentation about how to use Protobuf Python, see
-https://protobuf.dev/getting-started/pythontutorial/
-
-# Building packages from this repo
+## Building packages from this repo
 
 If for some reason you wish to build the packages directly from this repo, you
 can use the following Bazel commands:
@@ -29,6 +31,15 @@ The binary wheel will build against whatever version of Python is installed on
 your system. The source package is always the same and does not depend on a
 local version of Python.
 
+## Building from `setup.py`
+
+We support building from `setup.py`, but only from a Python source package.
+You cannot build from `setup.py` using the GitHub repo or the GitHub source
+tarball.
+
+To build a source package from this repo, see the instructions in the previous
+section.
+
 # Implementation backends
 
 There are three separate implementations of Python Protobuf. All of them offer

python/build_targets.bzl

@@ -461,7 +461,6 @@ def build_targets(name):
             ":python_src_files",
             "README.md",
             "google/__init__.py",
-            "setup.cfg",
         ],
         strip_prefix = "",
         visibility = ["//python/dist:__pkg__"],
@@ -485,8 +484,6 @@ def build_targets(name):
             "google/protobuf/python_protobuf.h",
             "internal.bzl",
             "python_version_test.py",
-            "setup.cfg",
-            "setup.py",
         ],
         strip_prefix = strip_prefix.from_root(""),
         visibility = ["//pkg:__pkg__"],