bdist_egg --exclude-source-files does not work with Python3

(Coming from here: https://bugs.python.org/issue28630)

I'm trying to prepare an egg file without source code.
I had used python setup.py bdist_egg --exclude-source-files, which does not work with Python3.

After digging into the issue more, I found PEP-3147 is related to the problem.
https://www.python.org/dev/peps/pep-3147/

$ git clone https://github.com/dmiyakawa/python_greeting.git
..
$ cd python_greeting
$ python --version
Python 3.5.2
$ python setup.py bdist_egg --exclude-source-files
..
$ unzip -l dist/greeting-1.0.0-py3.5.egg
Archive:  dist/greeting-1.0.0-py3.5.egg
  Length      Date    Time    Name
---------  ---------- -----   ----
        1  11-09-2016 16:31   EGG-INFO/dependency_links.txt
       57  11-09-2016 16:31   EGG-INFO/entry_points.txt
      319  11-09-2016 16:31   EGG-INFO/PKG-INFO
      213  11-09-2016 16:31   EGG-INFO/SOURCES.txt
        9  11-09-2016 16:31   EGG-INFO/top_level.txt
        1  11-09-2016 16:31   EGG-INFO/zip-safe
      139  11-09-2016 16:31   greeting/__pycache__/__init__.cpython-35.pyc
      392  11-09-2016 16:31   greeting/__pycache__/greeting.cpython-35.pyc
---------                     -------
     1131                     8 files

Here, greeting/__pycache__/__init__.cpython-35.pyc and greeting/__pycache__/greeting.cpython-35.pyc are not where they should be.
See the following results (with Python 2.7.12)

$ python --version
Python 2.7.12
$ python setup.py bdist_egg --exclude-source-files
..
$ unzip -l dist/greeting-1.0.0-py2.7.egg
Archive:  dist/greeting-1.0.0-py2.7.egg
  Length      Date    Time    Name
---------  ---------- -----   ----
        1  11-09-2016 16:32   EGG-INFO/dependency_links.txt
       57  11-09-2016 16:32   EGG-INFO/entry_points.txt
      319  11-09-2016 16:32   EGG-INFO/PKG-INFO
      213  11-09-2016 16:32   EGG-INFO/SOURCES.txt
        9  11-09-2016 16:32   EGG-INFO/top_level.txt
        1  11-09-2016 16:32   EGG-INFO/zip-safe
      143  11-09-2016 16:32   greeting/__init__.pyc
      482  11-09-2016 16:32   greeting/greeting.pyc
---------                     -------
     1225                     8 files

According to the chart in PEP-3147, original py file must also exist to make pyc cache in __pycache__ effective.

To let bdist_egg's --exclude-sourcce-files option work as it worked in Python2 era, pyc files in __pycache__ must be at where legacy Python2 placed. I tried tweaking the Py3's egg content with the following code, and the tweaked egg worked nicely.

RE_PYCACHE_FILE = re.compile('(.+/)__pycache__/(.+)\.cpython-3\d(.pyc)$')

with tempfile.TemporaryDirectory() as tmpdir:
    names_lst = []
    tmpdir_abs_path = os.path.abspath(tmpdir)
    with ZipFile(egg_path, 'r') as zf:
        for name in zf.namelist():
            m = RE_PYCACHE_FILE.match(name)
            if m:
                w_name = m.group(1) + m.group(2) + m.group(3)
            else:
                w_name = name
            w_path = os.path.join(tmpdir_abs_path, w_name)
            dir_path = os.path.dirname(w_path)
            if not os.path.exists(dir_path):
                os.makedirs(dir_path)
            with open(w_path, 'wb') as file_to_write:
                with zf.open(name) as file_to_read:
                    file_to_write.write(file_to_read.read())
            names_lst.append(w_name)
    with ZipFile(egg_path, 'w', compression=ZIP_DEFLATED) as zf:
        for name in names_lst:
            r_path = os.path.join(tmpdir_abs_path, name)
            zf.write(r_path, arcname=name)

Start at the bdist_egg entry point and reproduce the issue with python setup.py bdist_egg --exclude-source-files using the Python 3 example. Compare the generated archive with the Python 2 listing and review PEP 3147's cache-path rules. Done means Python 3 eggs exclude source files while placing bytecode where they remain usable.