How to set python source code encoding with swig

Question

When I wraps a library with swig

swig -python my_ext.i

This generate a my_ext.py file.

How to add file encoding in the first line, when creating my extension with distutils.extension.Extension ?

# -*- coding: utf-8

I have tried:

%pythonbegin %{
# -*- coding: utf-8
%}

But my comment is append after swig banner.

Does your SWIG output include non-ASCII characters without an encoding declaration? If so, that's a SWIG bug. (Wait, no, they changed the default in 3.0 - no encoding declaration is necessary for UTF-8.) — user2357112
– user2357112, Commented Nov 23, 2021 at 17:06
I use docstrings to generate the documentation. So my .i file is utf-8 and contains lots of é, è, à, ... And I also need to maintain py2 code. — Balaïtous
– Balaïtous, Commented Nov 23, 2021 at 17:08

Balaïtous · Accepted Answer · 2021-11-23 17:00:12Z

The only solution I have found is to override the build_ext command:

from setuptools.command.build_ext import build_ext as _build_ext

if sys.version_info[0] == 2:

    class build_ext(_build_ext):

        def swig_sources(self, sources, extension):
            new_sources = _build_ext.swig_sources(self, sources, extension)
            for src in sources:
                py_src = os.path.splitext(src)[0].replace("-", "_") + ".py"
                if os.path.exists(py_src):
                    with open(py_src) as infile:
                        content = infile.read()
                    with open(py_src, "w") as outfile:
                        outfile.write("# -*- coding: utf-8 -*-\n")
                        outfile.write(content)
            return new_sources

else:

    build_ext = _build_ext

...

setup(
    cmdclass={"build_ext": build_ext},
    ...
)

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