prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  mypy==0.782 will cause mypy-zope dependency regression in future pip releases
  ## Description
  
  Pip is planning to use a [new resolver by default from `20.3`](https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-2-2020), which is more strict in it's dependency handling.
  
  Currently, `tox`'s `mypy` test environment defines this:
  
  ```
  deps =
      {[base]deps}
      mypy==0.782
      mypy-zope
  ```
  
  Given that input, `pip>=20.3` will likely either:
  1. Choose an older `mypy-zope` package that works with `mypy==0.782`, causing a regression.
  2. ~~Reject installing outright, as this stricter dependency resolver will refuse to install incompatible packages.~~
  
  
  --- 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 #!/usr/bin/env python
  2 
  3 # Copyright 2014-2017 OpenMarket Ltd
  4 # Copyright 2017 Vector Creations Ltd
  5 # Copyright 2017-2018 New Vector Ltd
  6 #
  7 # Licensed under the Apache License, Version 2.0 (the "License");
  8 # you may not use this file except in compliance with the License.
  9 # You may obtain a copy of the License at
  10 #
  11 #     http://www.apache.org/licenses/LICENSE-2.0
  12 #
  13 # Unless required by applicable law or agreed to in writing, software
  14 # distributed under the License is distributed on an "AS IS" BASIS,
  15 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16 # See the License for the specific language governing permissions and
  17 # limitations under the License.
  18 import glob
  19 import os
  20 
  21 from setuptools import Command, find_packages, setup
  22 
  23 here = os.path.abspath(os.path.dirname(__file__))
  24 
  25 
  26 # Some notes on `setup.py test`:
  27 #
  28 # Once upon a time we used to try to make `setup.py test` run `tox` to run the
  29 # tests. That's a bad idea for three reasons:
  30 #
  31 # 1: `setup.py test` is supposed to find out whether the tests work in the
  32 #    *current* environmentt, not whatever tox sets up.
  33 # 2: Empirically, trying to install tox during the test run wasn't working ("No
  34 #    module named virtualenv").
  35 # 3: The tox documentation advises against it[1].
  36 #
  37 # Even further back in time, we used to use setuptools_trial [2]. That has its
  38 # own set of issues: for instance, it requires installation of Twisted to build
  39 # an sdist (because the recommended mode of usage is to add it to
  40 # `setup_requires`). That in turn means that in order to successfully run tox
  41 # you have to have the python header files installed for whichever version of
  42 # python tox uses (which is python3 on recent ubuntus, for example).
  43 #
  44 # So, for now at least, we stick with what appears to be the convention among
  45 # Twisted projects, and don't attempt to do anything when someone runs
  46 # `setup.py test`; instead we direct people to run `trial` directly if they
  47 # care.
  48 #
  49 # [1]: http://tox.readthedocs.io/en/2.5.0/example/basic.html#integration-with-setup-py-test-command
  50 # [2]: https://pypi.python.org/pypi/setuptools_trial
  51 class TestCommand(Command):
  52     user_options = []
  53 
  54     def initialize_options(self):
  55         pass
  56 
  57     def finalize_options(self):
  58         pass
  59 
  60     def run(self):
  61         print(
  62             """Synapse's tests cannot be run via setup.py. To run them, try:
  63      PYTHONPATH="." trial tests
  64 """
  65         )
  66 
  67 
  68 def read_file(path_segments):
  69     """Read a file from the package. Takes a list of strings to join to
  70     make the path"""
  71     file_path = os.path.join(here, *path_segments)
  72     with open(file_path) as f:
  73         return f.read()
  74 
  75 
  76 def exec_file(path_segments):
  77     """Execute a single python file to get the variables defined in it"""
  78     result = {}
  79     code = read_file(path_segments)
  80     exec(code, result)
  81     return result
  82 
  83 
  84 version = exec_file(("synapse", "__init__.py"))["__version__"]
  85 dependencies = exec_file(("synapse", "python_dependencies.py"))
  86 long_description = read_file(("README.rst",))
  87 
  88 REQUIREMENTS = dependencies["REQUIREMENTS"]
  89 CONDITIONAL_REQUIREMENTS = dependencies["CONDITIONAL_REQUIREMENTS"]
  90 ALL_OPTIONAL_REQUIREMENTS = dependencies["ALL_OPTIONAL_REQUIREMENTS"]
  91 
  92 # Make `pip install matrix-synapse[all]` install all the optional dependencies.
  93 CONDITIONAL_REQUIREMENTS["all"] = list(ALL_OPTIONAL_REQUIREMENTS)
  94 
  95 # Developer dependencies should not get included in "all".
  96 #
  97 # We pin black so that our tests don't start failing on new releases.
  98 CONDITIONAL_REQUIREMENTS["lint"] = [
  99     "isort==5.0.3",
  100     "black==19.10b0",
  101     "flake8-comprehensions",
  102     "flake8",
  103 ]
  104 
  105 # Dependencies which are exclusively required by unit test code. This is
  106 # NOT a list of all modules that are necessary to run the unit tests.
  107 # Tests assume that all optional dependencies are installed.
  108 #
  109 # parameterized_class decorator was introduced in parameterized 0.7.0
  110 CONDITIONAL_REQUIREMENTS["test"] = ["mock>=2.0", "parameterized>=0.7.0"]
  111 
  112 setup(
  113     name="matrix-synapse",
  114     version=version,
  115     packages=find_packages(exclude=["tests", "tests.*"]),
  116     description="Reference homeserver for the Matrix decentralised comms protocol",
  117     install_requires=REQUIREMENTS,
  118     extras_require=CONDITIONAL_REQUIREMENTS,
  119     include_package_data=True,
  120     zip_safe=False,
  121     long_description=long_description,
  122     python_requires="~=3.5",
  123     classifiers=[
  124         "Development Status :: 5 - Production/Stable",
  125         "Topic :: Communications :: Chat",
  126         "License :: OSI Approved :: Apache Software License",
  127         "Programming Language :: Python :: 3 :: Only",
  128         "Programming Language :: Python :: 3.5",
  129         "Programming Language :: Python :: 3.6",
  130         "Programming Language :: Python :: 3.7",
  131         "Programming Language :: Python :: 3.8",
  132     ],
  133     scripts=["synctl"] + glob.glob("scripts/*"),
  134     cmdclass={"test": TestCommand},
  135 )
  136
  ```
  --- 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()
  
  ```
  
golden_diff: diff --git a/setup.py b/setup.py
  --- a/setup.py
  +++ b/setup.py
  @@ -102,6 +102,8 @@
       "flake8",
   ]
   
  +CONDITIONAL_REQUIREMENTS["mypy"] = ["mypy==0.790", "mypy-zope"]
  +
   # Dependencies which are exclusively required by unit test code. This is
   # NOT a list of all modules that are necessary to run the unit tests.
   # Tests assume that all optional dependencies are installed.
  
verification_info: {"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -102,6 +102,8 @@\n     \"flake8\",\n ]\n \n+CONDITIONAL_REQUIREMENTS[\"mypy\"] = [\"mypy==0.790\", \"mypy-zope\"]\n+\n # Dependencies which are exclusively required by unit test code. This is\n # NOT a list of all modules that are necessary to run the unit tests.\n # Tests assume that all optional dependencies are installed.\n", "issue": "mypy==0.782 will cause mypy-zope dependency regression in future pip releases\n## Description\r\n\r\nPip is planning to use a [new resolver by default from `20.3`](https://pip.pypa.io/en/latest/user_guide/#changes-to-the-pip-dependency-resolver-in-20-2-2020), which is more strict in it's dependency handling.\r\n\r\nCurrently, `tox`'s `mypy` test environment defines this:\r\n\r\n```\r\ndeps =\r\n    {[base]deps}\r\n    mypy==0.782\r\n    mypy-zope\r\n```\r\n\r\nGiven that input, `pip>=20.3` will likely either:\r\n1. Choose an older `mypy-zope` package that works with `mypy==0.782`, causing a regression.\r\n2. ~~Reject installing outright, as this stricter dependency resolver will refuse to install incompatible packages.~~\r\n\n", "before_files": [{"content": "#!/usr/bin/env python\n\n# Copyright 2014-2017 OpenMarket Ltd\n# Copyright 2017 Vector Creations Ltd\n# Copyright 2017-2018 New Vector Ltd\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\nimport glob\nimport os\n\nfrom setuptools import Command, find_packages, setup\n\nhere = os.path.abspath(os.path.dirname(__file__))\n\n\n# Some notes on `setup.py test`:\n#\n# Once upon a time we used to try to make `setup.py test` run `tox` to run the\n# tests. That's a bad idea for three reasons:\n#\n# 1: `setup.py test` is supposed to find out whether the tests work in the\n#    *current* environmentt, not whatever tox sets up.\n# 2: Empirically, trying to install tox during the test run wasn't working (\"No\n#    module named virtualenv\").\n# 3: The tox documentation advises against it[1].\n#\n# Even further back in time, we used to use setuptools_trial [2]. That has its\n# own set of issues: for instance, it requires installation of Twisted to build\n# an sdist (because the recommended mode of usage is to add it to\n# `setup_requires`). That in turn means that in order to successfully run tox\n# you have to have the python header files installed for whichever version of\n# python tox uses (which is python3 on recent ubuntus, for example).\n#\n# So, for now at least, we stick with what appears to be the convention among\n# Twisted projects, and don't attempt to do anything when someone runs\n# `setup.py test`; instead we direct people to run `trial` directly if they\n# care.\n#\n# [1]: http://tox.readthedocs.io/en/2.5.0/example/basic.html#integration-with-setup-py-test-command\n# [2]: https://pypi.python.org/pypi/setuptools_trial\nclass TestCommand(Command):\n    user_options = []\n\n    def initialize_options(self):\n        pass\n\n    def finalize_options(self):\n        pass\n\n    def run(self):\n        print(\n            \"\"\"Synapse's tests cannot be run via setup.py. To run them, try:\n     PYTHONPATH=\".\" trial tests\n\"\"\"\n        )\n\n\ndef read_file(path_segments):\n    \"\"\"Read a file from the package. Takes a list of strings to join to\n    make the path\"\"\"\n    file_path = os.path.join(here, *path_segments)\n    with open(file_path) as f:\n        return f.read()\n\n\ndef exec_file(path_segments):\n    \"\"\"Execute a single python file to get the variables defined in it\"\"\"\n    result = {}\n    code = read_file(path_segments)\n    exec(code, result)\n    return result\n\n\nversion = exec_file((\"synapse\", \"__init__.py\"))[\"__version__\"]\ndependencies = exec_file((\"synapse\", \"python_dependencies.py\"))\nlong_description = read_file((\"README.rst\",))\n\nREQUIREMENTS = dependencies[\"REQUIREMENTS\"]\nCONDITIONAL_REQUIREMENTS = dependencies[\"CONDITIONAL_REQUIREMENTS\"]\nALL_OPTIONAL_REQUIREMENTS = dependencies[\"ALL_OPTIONAL_REQUIREMENTS\"]\n\n# Make `pip install matrix-synapse[all]` install all the optional dependencies.\nCONDITIONAL_REQUIREMENTS[\"all\"] = list(ALL_OPTIONAL_REQUIREMENTS)\n\n# Developer dependencies should not get included in \"all\".\n#\n# We pin black so that our tests don't start failing on new releases.\nCONDITIONAL_REQUIREMENTS[\"lint\"] = [\n    \"isort==5.0.3\",\n    \"black==19.10b0\",\n    \"flake8-comprehensions\",\n    \"flake8\",\n]\n\n# Dependencies which are exclusively required by unit test code. This is\n# NOT a list of all modules that are necessary to run the unit tests.\n# Tests assume that all optional dependencies are installed.\n#\n# parameterized_class decorator was introduced in parameterized 0.7.0\nCONDITIONAL_REQUIREMENTS[\"test\"] = [\"mock>=2.0\", \"parameterized>=0.7.0\"]\n\nsetup(\n    name=\"matrix-synapse\",\n    version=version,\n    packages=find_packages(exclude=[\"tests\", \"tests.*\"]),\n    description=\"Reference homeserver for the Matrix decentralised comms protocol\",\n    install_requires=REQUIREMENTS,\n    extras_require=CONDITIONAL_REQUIREMENTS,\n    include_package_data=True,\n    zip_safe=False,\n    long_description=long_description,\n    python_requires=\"~=3.5\",\n    classifiers=[\n        \"Development Status :: 5 - Production/Stable\",\n        \"Topic :: Communications :: Chat\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Programming Language :: Python :: 3 :: Only\",\n        \"Programming Language :: Python :: 3.5\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n    ],\n    scripts=[\"synctl\"] + glob.glob(\"scripts/*\"),\n    cmdclass={\"test\": TestCommand},\n)\n", "path": "setup.py"}], "after_files": [{"content": "#!/usr/bin/env python\n\n# Copyright 2014-2017 OpenMarket Ltd\n# Copyright 2017 Vector Creations Ltd\n# Copyright 2017-2018 New Vector Ltd\n#\n# Licensed under the Apache License, Version 2.0 (the \"License\");\n# you may not use this file except in compliance with the License.\n# You may obtain a copy of the License at\n#\n#     http://www.apache.org/licenses/LICENSE-2.0\n#\n# Unless required by applicable law or agreed to in writing, software\n# distributed under the License is distributed on an \"AS IS\" BASIS,\n# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n# See the License for the specific language governing permissions and\n# limitations under the License.\nimport glob\nimport os\n\nfrom setuptools import Command, find_packages, setup\n\nhere = os.path.abspath(os.path.dirname(__file__))\n\n\n# Some notes on `setup.py test`:\n#\n# Once upon a time we used to try to make `setup.py test` run `tox` to run the\n# tests. That's a bad idea for three reasons:\n#\n# 1: `setup.py test` is supposed to find out whether the tests work in the\n#    *current* environmentt, not whatever tox sets up.\n# 2: Empirically, trying to install tox during the test run wasn't working (\"No\n#    module named virtualenv\").\n# 3: The tox documentation advises against it[1].\n#\n# Even further back in time, we used to use setuptools_trial [2]. That has its\n# own set of issues: for instance, it requires installation of Twisted to build\n# an sdist (because the recommended mode of usage is to add it to\n# `setup_requires`). That in turn means that in order to successfully run tox\n# you have to have the python header files installed for whichever version of\n# python tox uses (which is python3 on recent ubuntus, for example).\n#\n# So, for now at least, we stick with what appears to be the convention among\n# Twisted projects, and don't attempt to do anything when someone runs\n# `setup.py test`; instead we direct people to run `trial` directly if they\n# care.\n#\n# [1]: http://tox.readthedocs.io/en/2.5.0/example/basic.html#integration-with-setup-py-test-command\n# [2]: https://pypi.python.org/pypi/setuptools_trial\nclass TestCommand(Command):\n    user_options = []\n\n    def initialize_options(self):\n        pass\n\n    def finalize_options(self):\n        pass\n\n    def run(self):\n        print(\n            \"\"\"Synapse's tests cannot be run via setup.py. To run them, try:\n     PYTHONPATH=\".\" trial tests\n\"\"\"\n        )\n\n\ndef read_file(path_segments):\n    \"\"\"Read a file from the package. Takes a list of strings to join to\n    make the path\"\"\"\n    file_path = os.path.join(here, *path_segments)\n    with open(file_path) as f:\n        return f.read()\n\n\ndef exec_file(path_segments):\n    \"\"\"Execute a single python file to get the variables defined in it\"\"\"\n    result = {}\n    code = read_file(path_segments)\n    exec(code, result)\n    return result\n\n\nversion = exec_file((\"synapse\", \"__init__.py\"))[\"__version__\"]\ndependencies = exec_file((\"synapse\", \"python_dependencies.py\"))\nlong_description = read_file((\"README.rst\",))\n\nREQUIREMENTS = dependencies[\"REQUIREMENTS\"]\nCONDITIONAL_REQUIREMENTS = dependencies[\"CONDITIONAL_REQUIREMENTS\"]\nALL_OPTIONAL_REQUIREMENTS = dependencies[\"ALL_OPTIONAL_REQUIREMENTS\"]\n\n# Make `pip install matrix-synapse[all]` install all the optional dependencies.\nCONDITIONAL_REQUIREMENTS[\"all\"] = list(ALL_OPTIONAL_REQUIREMENTS)\n\n# Developer dependencies should not get included in \"all\".\n#\n# We pin black so that our tests don't start failing on new releases.\nCONDITIONAL_REQUIREMENTS[\"lint\"] = [\n    \"isort==5.0.3\",\n    \"black==19.10b0\",\n    \"flake8-comprehensions\",\n    \"flake8\",\n]\n\nCONDITIONAL_REQUIREMENTS[\"mypy\"] = [\"mypy==0.790\", \"mypy-zope\"]\n\n# Dependencies which are exclusively required by unit test code. This is\n# NOT a list of all modules that are necessary to run the unit tests.\n# Tests assume that all optional dependencies are installed.\n#\n# parameterized_class decorator was introduced in parameterized 0.7.0\nCONDITIONAL_REQUIREMENTS[\"test\"] = [\"mock>=2.0\", \"parameterized>=0.7.0\"]\n\nsetup(\n    name=\"matrix-synapse\",\n    version=version,\n    packages=find_packages(exclude=[\"tests\", \"tests.*\"]),\n    description=\"Reference homeserver for the Matrix decentralised comms protocol\",\n    install_requires=REQUIREMENTS,\n    extras_require=CONDITIONAL_REQUIREMENTS,\n    include_package_data=True,\n    zip_safe=False,\n    long_description=long_description,\n    python_requires=\"~=3.5\",\n    classifiers=[\n        \"Development Status :: 5 - Production/Stable\",\n        \"Topic :: Communications :: Chat\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Programming Language :: Python :: 3 :: Only\",\n        \"Programming Language :: Python :: 3.5\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n    ],\n    scripts=[\"synctl\"] + glob.glob(\"scripts/*\"),\n    cmdclass={\"test\": TestCommand},\n)\n", "path": "setup.py"}]}