We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Issue with Twisted and Python 3.4 
Twisted had a patch 3 days ago and it's causing test suite to fail for py34 environment. 
Twisted , according to their Readme, support Python 3.5+. This needs to be fixed if the builds need to pass

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `setup.py`
Content:
```
1 from os.path import dirname, join
2 from pkg_resources import parse_version
3 from setuptools import setup, find_packages, __version__ as setuptools_version
4 
5 
6 with open(join(dirname(__file__), 'scrapy/VERSION'), 'rb') as f:
7     version = f.read().decode('ascii').strip()
8 
9 
10 def has_environment_marker_platform_impl_support():
11     """Code extracted from 'pytest/setup.py'
12     https://github.com/pytest-dev/pytest/blob/7538680c/setup.py#L31
13 
14     The first known release to support environment marker with range operators
15     it is 18.5, see:
16     https://setuptools.readthedocs.io/en/latest/history.html#id235
17     """
18     return parse_version(setuptools_version) >= parse_version('18.5')
19 
20 
21 extras_require = {}
22 
23 if has_environment_marker_platform_impl_support():
24     extras_require[':platform_python_implementation == "PyPy"'] = [
25         'PyPyDispatcher>=2.1.0',
26     ]
27 
28 
29 setup(
30     name='Scrapy',
31     version=version,
32     url='https://scrapy.org',
33     description='A high-level Web Crawling and Web Scraping framework',
34     long_description=open('README.rst').read(),
35     author='Scrapy developers',
36     maintainer='Pablo Hoffman',
37     maintainer_email='pablo@pablohoffman.com',
38     license='BSD',
39     packages=find_packages(exclude=('tests', 'tests.*')),
40     include_package_data=True,
41     zip_safe=False,
42     entry_points={
43         'console_scripts': ['scrapy = scrapy.cmdline:execute']
44     },
45     classifiers=[
46         'Framework :: Scrapy',
47         'Development Status :: 5 - Production/Stable',
48         'Environment :: Console',
49         'Intended Audience :: Developers',
50         'License :: OSI Approved :: BSD License',
51         'Operating System :: OS Independent',
52         'Programming Language :: Python',
53         'Programming Language :: Python :: 2',
54         'Programming Language :: Python :: 2.7',
55         'Programming Language :: Python :: 3',
56         'Programming Language :: Python :: 3.4',
57         'Programming Language :: Python :: 3.5',
58         'Programming Language :: Python :: 3.6',
59         'Programming Language :: Python :: 3.7',
60         'Programming Language :: Python :: Implementation :: CPython',
61         'Programming Language :: Python :: Implementation :: PyPy',
62         'Topic :: Internet :: WWW/HTTP',
63         'Topic :: Software Development :: Libraries :: Application Frameworks',
64         'Topic :: Software Development :: Libraries :: Python Modules',
65     ],
66     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
67     install_requires=[
68         'Twisted>=13.1.0',
69         'w3lib>=1.17.0',
70         'queuelib',
71         'lxml',
72         'pyOpenSSL',
73         'cssselect>=0.9',
74         'six>=1.5.2',
75         'parsel>=1.5',
76         'PyDispatcher>=2.0.5',
77         'service_identity',
78     ],
79     extras_require=extras_require,
80 )
81
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/setup.py b/setup.py
--- a/setup.py
+++ b/setup.py
@@ -65,7 +65,8 @@
     ],
     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',
     install_requires=[
-        'Twisted>=13.1.0',
+        'Twisted>=13.1.0;python_version!="3.4"',
+        'Twisted>=13.1.0,<=19.2.0;python_version=="3.4"',
         'w3lib>=1.17.0',
         'queuelib',
         'lxml',

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -65,7 +65,8 @@\n     ],\n     python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',\n     install_requires=[\n-        'Twisted>=13.1.0',\n+        'Twisted>=13.1.0;python_version!=\"3.4\"',\n+        'Twisted>=13.1.0,<=19.2.0;python_version==\"3.4\"',\n         'w3lib>=1.17.0',\n         'queuelib',\n         'lxml',\n", "issue": "Issue with Twisted and Python 3.4 \nTwisted had a patch 3 days ago and it's causing test suite to fail for py34 environment. \r\nTwisted , according to their Readme, support Python 3.5+. This needs to be fixed if the builds need to pass\n", "before_files": [{"content": "from os.path import dirname, join\nfrom pkg_resources import parse_version\nfrom setuptools import setup, find_packages, __version__ as setuptools_version\n\n\nwith open(join(dirname(__file__), 'scrapy/VERSION'), 'rb') as f:\n    version = f.read().decode('ascii').strip()\n\n\ndef has_environment_marker_platform_impl_support():\n    \"\"\"Code extracted from 'pytest/setup.py'\n    https://github.com/pytest-dev/pytest/blob/7538680c/setup.py#L31\n\n    The first known release to support environment marker with range operators\n    it is 18.5, see:\n    https://setuptools.readthedocs.io/en/latest/history.html#id235\n    \"\"\"\n    return parse_version(setuptools_version) >= parse_version('18.5')\n\n\nextras_require = {}\n\nif has_environment_marker_platform_impl_support():\n    extras_require[':platform_python_implementation == \"PyPy\"'] = [\n        'PyPyDispatcher>=2.1.0',\n    ]\n\n\nsetup(\n    name='Scrapy',\n    version=version,\n    url='https://scrapy.org',\n    description='A high-level Web Crawling and Web Scraping framework',\n    long_description=open('README.rst').read(),\n    author='Scrapy developers',\n    maintainer='Pablo Hoffman',\n    maintainer_email='pablo@pablohoffman.com',\n    license='BSD',\n    packages=find_packages(exclude=('tests', 'tests.*')),\n    include_package_data=True,\n    zip_safe=False,\n    entry_points={\n        'console_scripts': ['scrapy = scrapy.cmdline:execute']\n    },\n    classifiers=[\n        'Framework :: Scrapy',\n        'Development Status :: 5 - Production/Stable',\n        'Environment :: Console',\n        'Intended Audience :: Developers',\n        'License :: OSI Approved :: BSD License',\n        'Operating System :: OS Independent',\n        'Programming Language :: Python',\n        'Programming Language :: Python :: 2',\n        'Programming Language :: Python :: 2.7',\n        'Programming Language :: Python :: 3',\n        'Programming Language :: Python :: 3.4',\n        'Programming Language :: Python :: 3.5',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Programming Language :: Python :: Implementation :: CPython',\n        'Programming Language :: Python :: Implementation :: PyPy',\n        'Topic :: Internet :: WWW/HTTP',\n        'Topic :: Software Development :: Libraries :: Application Frameworks',\n        'Topic :: Software Development :: Libraries :: Python Modules',\n    ],\n    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',\n    install_requires=[\n        'Twisted>=13.1.0',\n        'w3lib>=1.17.0',\n        'queuelib',\n        'lxml',\n        'pyOpenSSL',\n        'cssselect>=0.9',\n        'six>=1.5.2',\n        'parsel>=1.5',\n        'PyDispatcher>=2.0.5',\n        'service_identity',\n    ],\n    extras_require=extras_require,\n)\n", "path": "setup.py"}], "after_files": [{"content": "from os.path import dirname, join\nfrom pkg_resources import parse_version\nfrom setuptools import setup, find_packages, __version__ as setuptools_version\n\n\nwith open(join(dirname(__file__), 'scrapy/VERSION'), 'rb') as f:\n    version = f.read().decode('ascii').strip()\n\n\ndef has_environment_marker_platform_impl_support():\n    \"\"\"Code extracted from 'pytest/setup.py'\n    https://github.com/pytest-dev/pytest/blob/7538680c/setup.py#L31\n\n    The first known release to support environment marker with range operators\n    it is 18.5, see:\n    https://setuptools.readthedocs.io/en/latest/history.html#id235\n    \"\"\"\n    return parse_version(setuptools_version) >= parse_version('18.5')\n\n\nextras_require = {}\n\nif has_environment_marker_platform_impl_support():\n    extras_require[':platform_python_implementation == \"PyPy\"'] = [\n        'PyPyDispatcher>=2.1.0',\n    ]\n\n\nsetup(\n    name='Scrapy',\n    version=version,\n    url='https://scrapy.org',\n    description='A high-level Web Crawling and Web Scraping framework',\n    long_description=open('README.rst').read(),\n    author='Scrapy developers',\n    maintainer='Pablo Hoffman',\n    maintainer_email='pablo@pablohoffman.com',\n    license='BSD',\n    packages=find_packages(exclude=('tests', 'tests.*')),\n    include_package_data=True,\n    zip_safe=False,\n    entry_points={\n        'console_scripts': ['scrapy = scrapy.cmdline:execute']\n    },\n    classifiers=[\n        'Framework :: Scrapy',\n        'Development Status :: 5 - Production/Stable',\n        'Environment :: Console',\n        'Intended Audience :: Developers',\n        'License :: OSI Approved :: BSD License',\n        'Operating System :: OS Independent',\n        'Programming Language :: Python',\n        'Programming Language :: Python :: 2',\n        'Programming Language :: Python :: 2.7',\n        'Programming Language :: Python :: 3',\n        'Programming Language :: Python :: 3.4',\n        'Programming Language :: Python :: 3.5',\n        'Programming Language :: Python :: 3.6',\n        'Programming Language :: Python :: 3.7',\n        'Programming Language :: Python :: Implementation :: CPython',\n        'Programming Language :: Python :: Implementation :: PyPy',\n        'Topic :: Internet :: WWW/HTTP',\n        'Topic :: Software Development :: Libraries :: Application Frameworks',\n        'Topic :: Software Development :: Libraries :: Python Modules',\n    ],\n    python_requires='>=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*',\n    install_requires=[\n        'Twisted>=13.1.0;python_version!=\"3.4\"',\n        'Twisted>=13.1.0,<=19.2.0;python_version==\"3.4\"',\n        'w3lib>=1.17.0',\n        'queuelib',\n        'lxml',\n        'pyOpenSSL',\n        'cssselect>=0.9',\n        'six>=1.5.2',\n        'parsel>=1.5',\n        'PyDispatcher>=2.0.5',\n        'service_identity',\n    ],\n    extras_require=extras_require,\n)\n", "path": "setup.py"}]}