add style checks
diff --git a/setup.py b/setup.py
index f93e52d..4ad5182 100644
--- a/setup.py
+++ b/setup.py
@@ -1,33 +1,27 @@
 from __future__ import print_function
 
-import sys
-
 import io
 import re
-from distutils.errors import (
-    CCompilerError,
-    DistutilsExecError,
-    DistutilsPlatformError,
-)
-from setuptools import (
-    Extension,
-    find_packages,
-    setup,
-)
+import sys
+from distutils.errors import CCompilerError
+from distutils.errors import DistutilsExecError
+from distutils.errors import DistutilsPlatformError
+
+from setuptools import Extension
+from setuptools import find_packages
+from setuptools import setup
 from setuptools.command.build_ext import build_ext
 
-with io.open('README.rst', 'rt', encoding='utf8') as f:
+with io.open("README.rst", "rt", encoding="utf8") as f:
     readme = f.read()
 
-with io.open('src/markupsafe/__init__.py', 'rt', encoding='utf8') as f:
-    version = re.search(r'__version__ = \'(.*?)\'', f.read()).group(1)
+with io.open("src/markupsafe/__init__.py", "rt", encoding="utf8") as f:
+    version = re.search(r'__version__ = "(.*?)"', f.read()).group(1)
 
-is_jython = 'java' in sys.platform
-is_pypy = hasattr(sys, 'pypy_version_info')
+is_jython = "java" in sys.platform
+is_pypy = hasattr(sys, "pypy_version_info")
 
-ext_modules = [
-    Extension('markupsafe._speedups', ['src/markupsafe/_speedups.c']),
-]
+ext_modules = [Extension("markupsafe._speedups", ["src/markupsafe/_speedups.c"])]
 
 
 class BuildFailed(Exception):
@@ -50,60 +44,60 @@
             raise BuildFailed()
         except ValueError:
             # this can happen on Windows 64 bit, see Python issue 7511
-            if "'path'" in str(sys.exc_info()[1]): # works with Python 2 and 3
+            if "'path'" in str(sys.exc_info()[1]):  # works with Python 2 and 3
                 raise BuildFailed()
             raise
 
 
 def run_setup(with_binary):
     setup(
-        name='MarkupSafe',
+        name="MarkupSafe",
         version=version,
-        url='https://www.palletsprojects.com/p/markupsafe/',
+        url="https://www.palletsprojects.com/p/markupsafe/",
         project_urls={
             "Documentation": "https://markupsafe.palletsprojects.com/",
             "Code": "https://github.com/pallets/markupsafe",
             "Issue tracker": "https://github.com/pallets/markupsafe/issues",
         },
-        license='BSD',
-        author='Armin Ronacher',
-        author_email='armin.ronacher@active-4.com',
-        maintainer='Pallets Team',
-        maintainer_email='contact@palletsprojects.com',
-        description='Safely add untrusted strings to HTML/XML markup.',
+        license="BSD",
+        author="Armin Ronacher",
+        author_email="armin.ronacher@active-4.com",
+        maintainer="Pallets Team",
+        maintainer_email="contact@palletsprojects.com",
+        description="Safely add untrusted strings to HTML/XML markup.",
         long_description=readme,
         classifiers=[
-            'Development Status :: 5 - Production/Stable',
-            'Environment :: Web Environment',
-            'Intended Audience :: Developers',
-            'License :: OSI Approved :: BSD License',
-            'Operating System :: OS Independent',
-            'Programming Language :: Python',
-            'Programming Language :: Python :: 2',
-            'Programming Language :: Python :: 2.7',
-            'Programming Language :: Python :: 3',
-            'Programming Language :: Python :: 3.4',
-            'Programming Language :: Python :: 3.5',
-            'Programming Language :: Python :: 3.6',
-            'Programming Language :: Python :: 3.7',
-            'Topic :: Internet :: WWW/HTTP :: Dynamic Content',
-            'Topic :: Software Development :: Libraries :: Python Modules',
-            'Topic :: Text Processing :: Markup :: HTML',
+            "Development Status :: 5 - Production/Stable",
+            "Environment :: Web Environment",
+            "Intended Audience :: Developers",
+            "License :: OSI Approved :: BSD License",
+            "Operating System :: OS Independent",
+            "Programming Language :: Python",
+            "Programming Language :: Python :: 2",
+            "Programming Language :: Python :: 2.7",
+            "Programming Language :: Python :: 3",
+            "Programming Language :: Python :: 3.4",
+            "Programming Language :: Python :: 3.5",
+            "Programming Language :: Python :: 3.6",
+            "Programming Language :: Python :: 3.7",
+            "Topic :: Internet :: WWW/HTTP :: Dynamic Content",
+            "Topic :: Software Development :: Libraries :: Python Modules",
+            "Topic :: Text Processing :: Markup :: HTML",
         ],
         packages=find_packages("src"),
         package_dir={"": "src"},
         include_package_data=True,
-        python_requires='>=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*',
-        cmdclass={'build_ext': ve_build_ext},
+        python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*",
+        cmdclass={"build_ext": ve_build_ext},
         ext_modules=ext_modules if with_binary else [],
     )
 
 
 def show_message(*lines):
-    print('=' * 74)
+    print("=" * 74)
     for line in lines:
         print(line)
-    print('=' * 74)
+    print("=" * 74)
 
 
 if not (is_pypy or is_jython):
@@ -111,21 +105,21 @@
         run_setup(True)
     except BuildFailed:
         show_message(
-            'WARNING: The C extension could not be compiled, speedups'
-            ' are not enabled.',
-            'Failure information, if any, is above.',
-            'Retrying the build without the C extension now.'
+            "WARNING: The C extension could not be compiled, speedups"
+            " are not enabled.",
+            "Failure information, if any, is above.",
+            "Retrying the build without the C extension now.",
         )
         run_setup(False)
         show_message(
-            'WARNING: The C extension could not be compiled, speedups'
-            ' are not enabled.',
-            'Plain-Python build succeeded.'
+            "WARNING: The C extension could not be compiled, speedups"
+            " are not enabled.",
+            "Plain-Python build succeeded.",
         )
 else:
     run_setup(False)
     show_message(
-        'WARNING: C extensions are not supported on this Python'
-        ' platform, speedups are not enabled.',
-        'Plain-Python build succeeded.'
+        "WARNING: C extensions are not supported on this Python"
+        " platform, speedups are not enabled.",
+        "Plain-Python build succeeded.",
     )