We will start out with the following file tree:

.
├── account
│   ├── account.h
│   ├── CMakeLists.txt
│   ├── implementation
│   │   └── fortran_implementation.f90
│   ├── __init__.py
│   ├── interface_file_names.cfg.in
│   ├── test.py
│   └── version.py
├── CMakeLists.txt
├── MANIFEST.in
├── README.rst
└── setup.py

The top-level CMakeLists.txt file and all sources below account, except account/CMakeLists.txt, are unchanged from how they appeared in Chapter 9, Mixed-language Projects, Recipe 6, Mixing C, C++, Fortran, and Python using Python CFFI. We will shortly discuss the small changes we need to apply to account/CMakeLists.txt. The README.rst file is identical with the previous recipe. The setup.py script contains one extra line compared to the previous recipe (the line containing install_requires=['cffi']):

# ... up to this line the script is unchanged

setup(
    name=_this_package,
    version=version['__version__'],
    description='Description in here.',
    long_description=long_description,
    author='Bruce Wayne',
    author_email='bruce.wayne@example.com',
    url='http://example.com',
    license='MIT',
    packages=[_this_package],
    install_requires=['cffi'],
    include_package_data=True,
    classifiers=[
        'Development Status :: 3 - Alpha',
        'Intended Audience :: Science/Research',
        'Programming Language :: Python :: 2.7',
        'Programming Language :: Python :: 3.6'
    ],
    cmdclass={'build': extend_build()})

MANIFEST.in lists files that should be installed along with the Python modules and packages and contains the following:

include README.rst CMakeLists.txt
recursive-include account *.h *.f90 CMakeLists.txt

Under the account subdirectory, we see two new files. Again, there is a version.py file holding the project version for setup.py:

__version__ = '0.0.0'

The subdirectory also holds the interface_file_names.cfg.in file, which we will be discussing soon:

[configuration]
header_file_name = account.h
library_file_name = $<TARGET_FILE_NAME:account>