Fix type equality checks

Use is/is not instead of == when checking for equality of types. Fixes linter errors that recently appeared in the flake8 checker.

setup.py.old

-import distutils
-import io
-import os
-from contextlib import redirect_stdout
-from importlib import import_module
-
-import setuptools
-
-import versioneer
-
-try:
-    import cython  # noqa
-
-    USE_CYTHON = True
-except ImportError:
-    USE_CYTHON = False
-
-quick_tests = [
-    'test_quicktests.test_basic_kernel',
-    'test_quicktests.test_basic_blocking_staggered',
-    'test_quicktests.test_basic_vectorization',
-]
-
-
-class SimpleTestRunner(distutils.cmd.Command):
-    """A custom command to run selected tests"""
-
-    description = 'run some quick tests'
-    user_options = []
-
-    @staticmethod
-    def _run_tests_in_module(test):
-        """Short test runner function - to work also if py.test is not installed."""
-        test = f'pystencils_tests.{test}'
-        mod, function_name = test.rsplit('.', 1)
-        if isinstance(mod, str):
-            mod = import_module(mod)
-
-        func = getattr(mod, function_name)
-        print(f"   -> {function_name} in {mod.__name__}")
-        with redirect_stdout(io.StringIO()):
-            func()
-
-    def initialize_options(self):
-        pass
-
-    def finalize_options(self):
-        pass
-
-    def run(self):
-        """Run command."""
-        for test in quick_tests:
-            self._run_tests_in_module(test)
-
-
-def readme():
-    with open('README.md') as f:
-        return f.read()
-
-
-def cython_extensions(*extensions):
-    from distutils.extension import Extension
-    if USE_CYTHON:
-        ext = '.pyx'
-        result = [Extension(e, [os.path.join(*e.split(".")) + ext]) for e in extensions]
-        from Cython.Build import cythonize
-        result = cythonize(result, language_level=3)
-        return result
-    elif all([os.path.exists(os.path.join(*e.split(".")) + '.c') for e in extensions]):
-        ext = '.c'
-        result = [Extension(e, [os.path.join(*e.split(".")) + ext]) for e in extensions]
-        return result
-    else:
-        return None
-
-
-def get_cmdclass():
-    cmdclass = {"quicktest": SimpleTestRunner}
-    cmdclass.update(versioneer.get_cmdclass())
-    return cmdclass
-
-
-setuptools.setup(name='pystencils',
-                 description='Speeding up stencil computations on CPUs and GPUs',
-                 version=versioneer.get_version(),
-                 long_description=readme(),
-                 long_description_content_type="text/markdown",
-                 author='Martin Bauer, Jan Hönig, Markus Holzer',
-                 license='AGPLv3',
-                 author_email='cs10-codegen@fau.de',
-                 url='https://i10git.cs.fau.de/pycodegen/pystencils/', 
-                 packages=['pystencils'] + ['pystencils.' + s for s in setuptools.find_packages('pystencils')], # TODO: Why?
-                 install_requires=['sympy>=1.6,<=1.11.1', 'numpy>=1.8.0', 'pymbolic>=2022.2', 'appdirs', 'joblib'],
-                 package_data={'pystencils': ['include/*.h', # todo: MANIFEST?
-                                              'backends/cuda_known_functions.txt',
-                                              'backends/opencl1.1_known_functions.txt',
-                                              'boundaries/createindexlistcython.c',
-                                              'boundaries/createindexlistcython.pyx']},
-                 ext_modules=cython_extensions("pystencils.boundaries.createindexlistcython"), # todo: must remain here
-                 classifiers=[
-                     'Development Status :: 4 - Beta',
-                     'Framework :: Jupyter',
-                     'Topic :: Software Development :: Code Generators',
-                     'Topic :: Scientific/Engineering :: Physics',
-                     'Intended Audience :: Developers',
-                     'Intended Audience :: Science/Research',
-                     'License :: OSI Approved :: GNU Affero General Public License v3 or later (AGPLv3+)',
-                 ],
-                 project_urls={
-                     "Bug Tracker": "https://i10git.cs.fau.de/pycodegen/pystencils/-/issues",
-                     "Documentation": "https://pycodegen.pages.i10git.cs.fau.de/pystencils/",
-                     "Source Code": "https://i10git.cs.fau.de/pycodegen/pystencils",
-                 },
-                 extras_require={
-                     'gpu': ['cupy'],
-                     'alltrafos': ['islpy', 'py-cpuinfo'],
-                     'bench_db': ['blitzdb', 'pymongo', 'pandas'],
-                     'interactive': ['matplotlib', 'ipy_table', 'imageio', 'jupyter', 'pyevtk', 'rich', 'graphviz'],
-                     'doc': ['sphinx', 'sphinx_rtd_theme', 'nbsphinx',
-                             'sphinxcontrib-bibtex', 'sphinx_autodoc_typehints', 'pandoc'],
-                     'use_cython': ['Cython']
-                 },
-                 tests_require=['pytest',
-                                'pytest-cov',
-                                'pytest-html',
-                                'ansi2html',
-                                'pytest-xdist',
-                                'flake8',
-                                'nbformat',
-                                'nbconvert',
-                                'ipython',
-                                'randomgen>=1.18'],
-
-                 python_requires=">=3.10",
-                 cmdclass=get_cmdclass() # todo: remove?
-                 )