Mixed python/cpp Ament package

Next Generation ROS
9

Okay, this is what I have right now. My package has the following structure -

- my_pkg
    - CMakeLists.txt
    - package.xml
    - src
        - talker.cpp
    - my_pkg
        - __init__.py
        - listener.py
    - setup.py

My CMakeLists.txt looks like this -

cmake_minimum_required(VERSION 3.5)

project(my_pkg)

if(NOT WIN32)
  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14 -Wall -Wextra -Wpedantic")
endif()

find_package(ament_cmake REQUIRED)
find_package(ament_cmake_python REQUIRED)
find_package(rclcpp REQUIRED)
find_package(std_msgs REQUIRED)
find_package(python_cmake_module REQUIRED)
find_package(PythonExtra MODULE)

ament_python_install_package(${PROJECT_NAME})

add_executable(${PROJECT_NAME}_talker src/talker.cpp)
ament_target_dependencies(${PROJECT_NAME}_talker rclcpp std_msgs)

install(TARGETS
  ${PROJECT_NAME}_talker
  DESTINATION bin
)

ament_package()

My setup.py looks like this -
from setuptools import setup, Extension

setup(
    name='my_pkg',
    version='0.0.0',
    packages=[],
    py_modules=[
        'my_pkg.listener',],
    install_requires=['setuptools'],
    author='user',
    author_email='user@gmail.com',
    maintainer='user
    maintainer_email='user@gmail.com',
    keywords=['ROS'],
    classifiers=[
        'Intended Audience :: Developers',
        'License :: OSI Approved :: Apache Software License',
        'Programming Language :: Python',
        'Topic :: Software Development',
    ],
    description='Mixed Ament package  for python and cpp files.',
    license='Apache License, Version 2.0',
    test_suite='test',
    entry_points={
        'console_scripts': [
            'my_pkg_listener = my_pkg.listener:main',
        ],
    },
)

I am able to compile the package, and generate an executable for my_pkg_talker.
However ament fails to recognize the setup.py and install a target for the python node. Is there something else I need to do specifically for ament to recognize the existence of a setup.py and run it?