How to use the poetry.utils._compat.to_str function in poetry

def test_make_pkg_info_any_python():
    poetry = Factory().create_poetry(project("module1"))

    builder = SdistBuilder(poetry, NullEnv(), NullIO())
    pkg_info = builder.build_pkg_info()
    p = Parser()
    parsed = p.parsestr(to_str(pkg_info))

    assert "Requires-Python" not in parsed

# Optional fields
        if self._meta.home_page:
            content += "Home-page: {}\n".format(self._meta.home_page)

        if self._meta.license:
            content += "License: {}\n".format(self._meta.license)

        if self._meta.keywords:
            content += "Keywords: {}\n".format(self._meta.keywords)

        if self._meta.author:
            content += "Author: {}\n".format(to_str(self._meta.author))

        if self._meta.author_email:
            content += "Author-email: {}\n".format(to_str(self._meta.author_email))

        if self._meta.maintainer:
            content += "Maintainer: {}\n".format(to_str(self._meta.maintainer))

        if self._meta.maintainer_email:
            content += "Maintainer-email: {}\n".format(
                to_str(self._meta.maintainer_email)
            )

        if self._meta.requires_python:
            content += "Requires-Python: {}\n".format(self._meta.requires_python)

        for classifier in self._meta.classifiers:
            content += "Classifier: {}\n".format(classifier)

        for extra in sorted(self._meta.provides_extra):

python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )

for extra in sorted(self._meta.provides_extra):
            content += "Provides-Extra: {}\n".format(extra)

        for dep in sorted(self._meta.requires_dist):
            content += "Requires-Dist: {}\n".format(dep)

        for url in sorted(self._meta.project_urls, key=lambda u: u[0]):
            content += "Project-URL: {}\n".format(to_str(url))

        if self._meta.description_content_type:
            content += "Description-Content-Type: {}\n".format(
                self._meta.description_content_type
            )

        if self._meta.description is not None:
            content += "\n" + to_str(self._meta.description) + "\n"

        return content

if self._package.python_versions != "*":
            python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )

extra.append("'extras_require': extras_require,")

        entry_points = self.convert_entry_points()
        if entry_points:
            before.append("entry_points = \\\n{}\n".format(pformat(entry_points)))
            extra.append("'entry_points': entry_points,")

        if self._package.python_versions != "*":
            python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )

entry_points = self.convert_entry_points()
        if entry_points:
            before.append("entry_points = \\\n{}\n".format(pformat(entry_points)))
            extra.append("'entry_points': entry_points,")

        if self._package.python_versions != "*":
            python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )

if entry_points:
            before.append("entry_points = \\\n{}\n".format(pformat(entry_points)))
            extra.append("'entry_points': entry_points,")

        if self._package.python_versions != "*":
            python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )

before.append("entry_points = \\\n{}\n".format(pformat(entry_points)))
            extra.append("'entry_points': entry_points,")

        if self._package.python_versions != "*":
            python_requires = self._meta.requires_python

            extra.append("'python_requires': {!r},".format(python_requires))

        return encode(
            SETUP.format(
                before="\n".join(before),
                name=to_str(self._meta.name),
                version=to_str(self._meta.version),
                description=to_str(self._meta.summary),
                long_description=to_str(self._meta.description),
                author=to_str(self._meta.author),
                author_email=to_str(self._meta.author_email),
                maintainer=to_str(self._meta.maintainer),
                maintainer_email=to_str(self._meta.maintainer_email),
                url=to_str(self._meta.home_page),
                extra="\n    ".join(extra),
                after="\n".join(after),
            )