We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Unit tests fail in Python 2.7, 3.5 (dependency issue)
Unit tests check fails on Python 2.7 and Python 3.5, because not all dependencies can be installed.

#### Environment details

  - OS type and version: Linux (and possibly others?)
  - Python version: 2.7, 3.5
  - pip version: `pip --version`: 20.0.2
  - `google-cloud-bigquery` version: 1.24.0

#### Steps to reproduce

  1. Run uni tests session for Python 2.7 or 3.5, e.g.:
    ```
    nox -f noxfile.py -s unit-2.7    
    ```
  2. Test do not run, an error occurs when installing dependencies.

#### Code example

```python
# example
```

#### Stack trace
```
Building wheels for collected packages: llvmlite
...
RuntimeError: Building llvmlite requires LLVM 7.0.x, 7.1.x or 8.0.x, got '11.0.0'. Be sure to set LLVM_CONFIG to the right executable path.
```

--- 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 # Copyright 2018 Google LLC
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #     http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 
15 import io
16 import os
17 
18 import setuptools
19 
20 
21 # Package metadata.
22 
23 name = "google-cloud-bigquery"
24 description = "Google BigQuery API client library"
25 version = "1.24.0"
26 # Should be one of:
27 # 'Development Status :: 3 - Alpha'
28 # 'Development Status :: 4 - Beta'
29 # 'Development Status :: 5 - Production/Stable'
30 release_status = "Development Status :: 5 - Production/Stable"
31 dependencies = [
32     'enum34; python_version < "3.4"',
33     "google-auth >= 1.9.0, < 2.0dev",
34     "google-api-core >= 1.15.0, < 2.0dev",
35     "google-cloud-core >= 1.1.0, < 2.0dev",
36     "google-resumable-media >= 0.5.0, < 0.6dev",
37     "protobuf >= 3.6.0",
38     "six >=1.13.0,< 2.0.0dev",
39 ]
40 extras = {
41     "bqstorage": [
42         "google-cloud-bigquery-storage >= 0.6.0, <2.0.0dev",
43         "pyarrow>=0.16.0, < 2.0dev",
44     ],
45     "pandas": ["pandas>=0.17.1"],
46     # Exclude PyArrow dependency from Windows Python 2.7.
47     'pyarrow: platform_system != "Windows" or python_version >= "3.4"': [
48         # Bad Linux release for 0.14.0.
49         # https://issues.apache.org/jira/browse/ARROW-5868
50         "pyarrow>=0.4.1, != 0.14.0"
51     ],
52     "tqdm": ["tqdm >= 4.0.0, <5.0.0dev"],
53     "fastparquet": ["fastparquet", "python-snappy"],
54 }
55 
56 all_extras = []
57 
58 for extra in extras:
59     if extra == "fastparquet":
60         # Skip fastparquet from "all" because it is redundant with pyarrow and
61         # creates a dependency on pre-release versions of numpy. See:
62         # https://github.com/googleapis/google-cloud-python/issues/8549
63         continue
64     all_extras.extend(extras[extra])
65 
66 extras["all"] = all_extras
67 
68 # Setup boilerplate below this line.
69 
70 package_root = os.path.abspath(os.path.dirname(__file__))
71 
72 readme_filename = os.path.join(package_root, "README.rst")
73 with io.open(readme_filename, encoding="utf-8") as readme_file:
74     readme = readme_file.read()
75 
76 # Only include packages under the 'google' namespace. Do not include tests,
77 # benchmarks, etc.
78 packages = [
79     package for package in setuptools.find_packages() if package.startswith("google")
80 ]
81 
82 # Determine which namespaces are needed.
83 namespaces = ["google"]
84 if "google.cloud" in packages:
85     namespaces.append("google.cloud")
86 
87 
88 setuptools.setup(
89     name=name,
90     version=version,
91     description=description,
92     long_description=readme,
93     author="Google LLC",
94     author_email="googleapis-packages@google.com",
95     license="Apache 2.0",
96     url="https://github.com/googleapis/python-bigquery",
97     classifiers=[
98         release_status,
99         "Intended Audience :: Developers",
100         "License :: OSI Approved :: Apache Software License",
101         "Programming Language :: Python",
102         "Programming Language :: Python :: 2",
103         "Programming Language :: Python :: 2.7",
104         "Programming Language :: Python :: 3",
105         "Programming Language :: Python :: 3.5",
106         "Programming Language :: Python :: 3.6",
107         "Programming Language :: Python :: 3.7",
108         "Programming Language :: Python :: 3.8",
109         "Operating System :: OS Independent",
110         "Topic :: Internet",
111     ],
112     platforms="Posix; MacOS X; Windows",
113     packages=packages,
114     namespace_packages=namespaces,
115     install_requires=dependencies,
116     extras_require=extras,
117     python_requires=">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*",
118     include_package_data=True,
119     zip_safe=False,
120 )
121
```
--- 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
@@ -50,7 +50,14 @@
         "pyarrow>=0.4.1, != 0.14.0"
     ],
     "tqdm": ["tqdm >= 4.0.0, <5.0.0dev"],
-    "fastparquet": ["fastparquet", "python-snappy"],
+    "fastparquet": [
+        "fastparquet",
+        "python-snappy",
+        # llvmlite >= 0.32.0 cannot be installed on Python 3.5 and below
+        # (building the wheel fails), thus needs to be restricted.
+        # See: https://github.com/googleapis/python-bigquery/issues/78
+        "llvmlite <= 0.31.0",
+    ],
 }
 
 all_extras = []

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -50,7 +50,14 @@\n         \"pyarrow>=0.4.1, != 0.14.0\"\n     ],\n     \"tqdm\": [\"tqdm >= 4.0.0, <5.0.0dev\"],\n-    \"fastparquet\": [\"fastparquet\", \"python-snappy\"],\n+    \"fastparquet\": [\n+        \"fastparquet\",\n+        \"python-snappy\",\n+        # llvmlite >= 0.32.0 cannot be installed on Python 3.5 and below\n+        # (building the wheel fails), thus needs to be restricted.\n+        # See: https://github.com/googleapis/python-bigquery/issues/78\n+        \"llvmlite <= 0.31.0\",\n+    ],\n }\n \n all_extras = []\n", "issue": "Unit tests fail in Python 2.7, 3.5 (dependency issue)\nUnit tests check fails on Python 2.7 and Python 3.5, because not all dependencies can be installed.\r\n\r\n#### Environment details\r\n\r\n  - OS type and version: Linux (and possibly others?)\r\n  - Python version: 2.7, 3.5\r\n  - pip version: `pip --version`: 20.0.2\r\n  - `google-cloud-bigquery` version: 1.24.0\r\n\r\n#### Steps to reproduce\r\n\r\n  1. Run uni tests session for Python 2.7 or 3.5, e.g.:\r\n    ```\r\n    nox -f noxfile.py -s unit-2.7    \r\n    ```\r\n  2. Test do not run, an error occurs when installing dependencies.\r\n\r\n#### Code example\r\n\r\n```python\r\n# example\r\n```\r\n\r\n#### Stack trace\r\n```\r\nBuilding wheels for collected packages: llvmlite\r\n...\r\nRuntimeError: Building llvmlite requires LLVM 7.0.x, 7.1.x or 8.0.x, got '11.0.0'. Be sure to set LLVM_CONFIG to the right executable path.\r\n```\n", "before_files": [{"content": "# Copyright 2018 Google LLC\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.\n\nimport io\nimport os\n\nimport setuptools\n\n\n# Package metadata.\n\nname = \"google-cloud-bigquery\"\ndescription = \"Google BigQuery API client library\"\nversion = \"1.24.0\"\n# Should be one of:\n# 'Development Status :: 3 - Alpha'\n# 'Development Status :: 4 - Beta'\n# 'Development Status :: 5 - Production/Stable'\nrelease_status = \"Development Status :: 5 - Production/Stable\"\ndependencies = [\n    'enum34; python_version < \"3.4\"',\n    \"google-auth >= 1.9.0, < 2.0dev\",\n    \"google-api-core >= 1.15.0, < 2.0dev\",\n    \"google-cloud-core >= 1.1.0, < 2.0dev\",\n    \"google-resumable-media >= 0.5.0, < 0.6dev\",\n    \"protobuf >= 3.6.0\",\n    \"six >=1.13.0,< 2.0.0dev\",\n]\nextras = {\n    \"bqstorage\": [\n        \"google-cloud-bigquery-storage >= 0.6.0, <2.0.0dev\",\n        \"pyarrow>=0.16.0, < 2.0dev\",\n    ],\n    \"pandas\": [\"pandas>=0.17.1\"],\n    # Exclude PyArrow dependency from Windows Python 2.7.\n    'pyarrow: platform_system != \"Windows\" or python_version >= \"3.4\"': [\n        # Bad Linux release for 0.14.0.\n        # https://issues.apache.org/jira/browse/ARROW-5868\n        \"pyarrow>=0.4.1, != 0.14.0\"\n    ],\n    \"tqdm\": [\"tqdm >= 4.0.0, <5.0.0dev\"],\n    \"fastparquet\": [\"fastparquet\", \"python-snappy\"],\n}\n\nall_extras = []\n\nfor extra in extras:\n    if extra == \"fastparquet\":\n        # Skip fastparquet from \"all\" because it is redundant with pyarrow and\n        # creates a dependency on pre-release versions of numpy. See:\n        # https://github.com/googleapis/google-cloud-python/issues/8549\n        continue\n    all_extras.extend(extras[extra])\n\nextras[\"all\"] = all_extras\n\n# Setup boilerplate below this line.\n\npackage_root = os.path.abspath(os.path.dirname(__file__))\n\nreadme_filename = os.path.join(package_root, \"README.rst\")\nwith io.open(readme_filename, encoding=\"utf-8\") as readme_file:\n    readme = readme_file.read()\n\n# Only include packages under the 'google' namespace. Do not include tests,\n# benchmarks, etc.\npackages = [\n    package for package in setuptools.find_packages() if package.startswith(\"google\")\n]\n\n# Determine which namespaces are needed.\nnamespaces = [\"google\"]\nif \"google.cloud\" in packages:\n    namespaces.append(\"google.cloud\")\n\n\nsetuptools.setup(\n    name=name,\n    version=version,\n    description=description,\n    long_description=readme,\n    author=\"Google LLC\",\n    author_email=\"googleapis-packages@google.com\",\n    license=\"Apache 2.0\",\n    url=\"https://github.com/googleapis/python-bigquery\",\n    classifiers=[\n        release_status,\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Programming Language :: Python\",\n        \"Programming Language :: Python :: 2\",\n        \"Programming Language :: Python :: 2.7\",\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.5\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet\",\n    ],\n    platforms=\"Posix; MacOS X; Windows\",\n    packages=packages,\n    namespace_packages=namespaces,\n    install_requires=dependencies,\n    extras_require=extras,\n    python_requires=\">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*\",\n    include_package_data=True,\n    zip_safe=False,\n)\n", "path": "setup.py"}], "after_files": [{"content": "# Copyright 2018 Google LLC\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.\n\nimport io\nimport os\n\nimport setuptools\n\n\n# Package metadata.\n\nname = \"google-cloud-bigquery\"\ndescription = \"Google BigQuery API client library\"\nversion = \"1.24.0\"\n# Should be one of:\n# 'Development Status :: 3 - Alpha'\n# 'Development Status :: 4 - Beta'\n# 'Development Status :: 5 - Production/Stable'\nrelease_status = \"Development Status :: 5 - Production/Stable\"\ndependencies = [\n    'enum34; python_version < \"3.4\"',\n    \"google-auth >= 1.9.0, < 2.0dev\",\n    \"google-api-core >= 1.15.0, < 2.0dev\",\n    \"google-cloud-core >= 1.1.0, < 2.0dev\",\n    \"google-resumable-media >= 0.5.0, < 0.6dev\",\n    \"protobuf >= 3.6.0\",\n    \"six >=1.13.0,< 2.0.0dev\",\n]\nextras = {\n    \"bqstorage\": [\n        \"google-cloud-bigquery-storage >= 0.6.0, <2.0.0dev\",\n        \"pyarrow>=0.16.0, < 2.0dev\",\n    ],\n    \"pandas\": [\"pandas>=0.17.1\"],\n    # Exclude PyArrow dependency from Windows Python 2.7.\n    'pyarrow: platform_system != \"Windows\" or python_version >= \"3.4\"': [\n        # Bad Linux release for 0.14.0.\n        # https://issues.apache.org/jira/browse/ARROW-5868\n        \"pyarrow>=0.4.1, != 0.14.0\"\n    ],\n    \"tqdm\": [\"tqdm >= 4.0.0, <5.0.0dev\"],\n    \"fastparquet\": [\n        \"fastparquet\",\n        \"python-snappy\",\n        # llvmlite >= 0.32.0 cannot be installed on Python 3.5 and below\n        # (building the wheel fails), thus needs to be restricted.\n        # See: https://github.com/googleapis/python-bigquery/issues/78\n        \"llvmlite <= 0.31.0\",\n    ],\n}\n\nall_extras = []\n\nfor extra in extras:\n    if extra == \"fastparquet\":\n        # Skip fastparquet from \"all\" because it is redundant with pyarrow and\n        # creates a dependency on pre-release versions of numpy. See:\n        # https://github.com/googleapis/google-cloud-python/issues/8549\n        continue\n    all_extras.extend(extras[extra])\n\nextras[\"all\"] = all_extras\n\n# Setup boilerplate below this line.\n\npackage_root = os.path.abspath(os.path.dirname(__file__))\n\nreadme_filename = os.path.join(package_root, \"README.rst\")\nwith io.open(readme_filename, encoding=\"utf-8\") as readme_file:\n    readme = readme_file.read()\n\n# Only include packages under the 'google' namespace. Do not include tests,\n# benchmarks, etc.\npackages = [\n    package for package in setuptools.find_packages() if package.startswith(\"google\")\n]\n\n# Determine which namespaces are needed.\nnamespaces = [\"google\"]\nif \"google.cloud\" in packages:\n    namespaces.append(\"google.cloud\")\n\n\nsetuptools.setup(\n    name=name,\n    version=version,\n    description=description,\n    long_description=readme,\n    author=\"Google LLC\",\n    author_email=\"googleapis-packages@google.com\",\n    license=\"Apache 2.0\",\n    url=\"https://github.com/googleapis/python-bigquery\",\n    classifiers=[\n        release_status,\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: Apache Software License\",\n        \"Programming Language :: Python\",\n        \"Programming Language :: Python :: 2\",\n        \"Programming Language :: Python :: 2.7\",\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.5\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet\",\n    ],\n    platforms=\"Posix; MacOS X; Windows\",\n    packages=packages,\n    namespace_packages=namespaces,\n    install_requires=dependencies,\n    extras_require=extras,\n    python_requires=\">=2.7,!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*\",\n    include_package_data=True,\n    zip_safe=False,\n)\n", "path": "setup.py"}]}