text: import codecs
  import pathlib
  import re
  import sys
  from distutils.command.build_ext import build_ext
  from distutils.errors import (CCompilerError, DistutilsExecError,
                                DistutilsPlatformError)
  
  from setuptools import Extension, setup
  
  
  if sys.version_info < (3, 5, 3):
      raise RuntimeError("aiohttp 3.x requires Python 3.5.3+")
  
  here = pathlib.Path(__file__).parent
  
  try:
      from Cython.Build import cythonize
      USE_CYTHON = True
  except ImportError:
      USE_CYTHON = False
  
  if (here / '.git').exists() and not USE_CYTHON:
      print("Install cython when building from git clone", file=sys.stderr)
      print("Hint:", file=sys.stderr)
      print("  pip install cython", file=sys.stderr)
      sys.exit(1)
  
  
  if (here / '.git').exists() and not (here / 'vendor/http-parser/README.md'):
      print("Install submodules when building from git clone", file=sys.stderr)
      print("Hint:", file=sys.stderr)
      print("  git submodule update --init", file=sys.stderr)
      sys.exit(2)
  
  
  ext = '.pyx' if USE_CYTHON else '.c'
  
  
  extensions = [Extension('aiohttp._websocket', ['aiohttp/_websocket' + ext]),
                Extension('aiohttp._http_parser',
                          ['aiohttp/_http_parser' + ext,
                           'vendor/http-parser/http_parser.c',
                           'aiohttp/_find_header.c'],
                          define_macros=[('HTTP_PARSER_STRICT', 0)],
                          ),
                Extension('aiohttp._frozenlist',
                          ['aiohttp/_frozenlist' + ext]),
                Extension('aiohttp._helpers',
                          ['aiohttp/_helpers' + ext]),
                Extension('aiohttp._http_writer',
                          ['aiohttp/_http_writer' + ext])]
  
  
  if USE_CYTHON:
      extensions = cythonize(extensions)
  
  
  class BuildFailed(Exception):
      pass
  
  
  class ve_build_ext(build_ext):
      # This class allows C extension building to fail.
  
      def run(self):
          try:
              build_ext.run(self)
          except (DistutilsPlatformError, FileNotFoundError):
              raise BuildFailed()
  
      def build_extension(self, ext):
          try:
              build_ext.build_extension(self, ext)
          except (CCompilerError, DistutilsExecError,
                  DistutilsPlatformError, ValueError):
              raise BuildFailed()
  
  
  
  txt = (here / 'aiohttp' / '__init__.py').read_text('utf-8')
  try:
      version = re.findall(r"^__version__ = '([^']+)'\r?$",
                           txt, re.M)[0]
  except IndexError:
      raise RuntimeError('Unable to determine version.')
  
  install_requires = [
      'attrs>=17.3.0',
      'chardet>=2.0,<4.0',
      'multidict>=4.0,<5.0',
      'async_timeout>=3.0,<4.0',
      'yarl>=1.0,<2.0',
      'idna-ssl>=1.0; python_version<"3.7"',
  ]
  
  
  def read(f):
      return (here / f).read_text('utf-8').strip()
  
  
  NEEDS_PYTEST = {'pytest', 'test'}.intersection(sys.argv)
  pytest_runner = ['pytest-runner'] if NEEDS_PYTEST else []
  
  tests_require = ['pytest', 'gunicorn',
                   'pytest-timeout', 'async-generator']
  
  
  args = dict(
      name='aiohttp',
      version=version,
      description='Async http client/server framework (asyncio)',
      long_description='\n\n'.join((read('README.rst'), read('CHANGES.rst'))),
      classifiers=[
          'License :: OSI Approved :: Apache Software License',
          'Intended Audience :: Developers',
          'Programming Language :: Python',
          'Programming Language :: Python :: 3',
          'Programming Language :: Python :: 3.5',
          'Programming Language :: Python :: 3.6',
          'Programming Language :: Python :: 3.7',
          'Development Status :: 5 - Production/Stable',
          'Operating System :: POSIX',
          'Operating System :: MacOS :: MacOS X',
          'Operating System :: Microsoft :: Windows',
          'Topic :: Internet :: WWW/HTTP',
          'Framework :: AsyncIO',
      ],
      author='Nikolay Kim',
      author_email='fafhrd91@gmail.com',
      maintainer=', '.join(('Nikolay Kim <fafhrd91@gmail.com>',
                            'Andrew Svetlov <andrew.svetlov@gmail.com>')),
      maintainer_email='aio-libs@googlegroups.com',
      url='https://github.com/aio-libs/aiohttp',
      project_urls={
          'Chat: Gitter': 'https://gitter.im/aio-libs/Lobby',
          'CI: AppVeyor': 'https://ci.appveyor.com/project/aio-libs/aiohttp',
          'CI: Circle': 'https://circleci.com/gh/aio-libs/aiohttp',
          'CI: Shippable': 'https://app.shippable.com/github/aio-libs/aiohttp',
          'CI: Travis': 'https://travis-ci.com/aio-libs/aiohttp',
          'Coverage: codecov': 'https://codecov.io/github/aio-libs/aiohttp',
          'Docs: RTD': 'https://docs.aiohttp.org',
          'GitHub: issues': 'https://github.com/aio-libs/aiohttp/issues',
          'GitHub: repo': 'https://github.com/aio-libs/aiohttp',
      },
      license='Apache 2',
      packages=['aiohttp'],
      python_requires='>=3.5.3',
      install_requires=install_requires,
      tests_require=tests_require,
      setup_requires=pytest_runner,
      include_package_data=True,
      ext_modules=extensions,
      cmdclass=dict(build_ext=ve_build_ext),
  )
  
  try:
      setup(**args)
  except BuildFailed:
      print("************************************************************")
      print("Cannot compile C accelerator module, use pure python version")
      print("************************************************************")
      del args['ext_modules']
      del args['cmdclass']
      setup(**args)
  