We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Missing py.typed declaration?
`mypy` is complaining about not being able to find type annotations for `httpx`: 

`error: Cannot find module named 'httpx'`

I'm somewhat new to using type annotations/static type checking in Python, but from the mypy documentation [here](https://mypy.readthedocs.io/en/latest/installed_packages.html#making-pep-561-compatible-packages) it looks like there may be a missing declaration in `setup.py`?

--- 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 # -*- coding: utf-8 -*-
3 
4 import re
5 from pathlib import Path
6 
7 from setuptools import setup
8 
9 
10 def get_version(package):
11     """
12     Return package version as listed in `__version__` in `init.py`.
13     """
14     version = Path(package, "__version__.py").read_text()
15     return re.search("__version__ = ['\"]([^'\"]+)['\"]", version).group(1)
16 
17 
18 def get_long_description():
19     """
20     Return the README.
21     """
22     long_description = ""
23     with open("README.md", encoding="utf8") as f:
24         long_description += f.read()
25     long_description += "\n\n"
26     with open("CHANGELOG.md", encoding="utf8") as f:
27         long_description += f.read()
28     return long_description
29 
30 
31 def get_packages(package):
32     """
33     Return root package and all sub-packages.
34     """
35     return [str(path.parent) for path in Path(package).glob("**/__init__.py")]
36 
37 
38 setup(
39     name="httpx",
40     python_requires=">=3.6",
41     version=get_version("httpx"),
42     url="https://github.com/encode/httpx",
43     license="BSD",
44     description="The next generation HTTP client.",
45     long_description=get_long_description(),
46     long_description_content_type="text/markdown",
47     author="Tom Christie",
48     author_email="tom@tomchristie.com",
49     package_data={"httpx": ["py.typed"]},
50     packages=get_packages("httpx"),
51     include_package_data=True,
52     install_requires=[
53         "certifi",
54         "chardet==3.*",
55         "h11==0.8.*",
56         "h2==3.*",
57         "hstspreload>=2019.8.27",
58         "idna==2.*",
59         "rfc3986==1.*",
60     ],
61     classifiers=[
62         "Development Status :: 3 - Alpha",
63         "Environment :: Web Environment",
64         "Intended Audience :: Developers",
65         "License :: OSI Approved :: BSD License",
66         "Operating System :: OS Independent",
67         "Topic :: Internet :: WWW/HTTP",
68         "Programming Language :: Python :: 3",
69         "Programming Language :: Python :: 3.6",
70         "Programming Language :: Python :: 3.7",
71         "Programming Language :: Python :: 3.8",
72     ],
73 )
74
```
--- 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
@@ -49,6 +49,7 @@
     package_data={"httpx": ["py.typed"]},
     packages=get_packages("httpx"),
     include_package_data=True,
+    zip_safe=False,
     install_requires=[
         "certifi",
         "chardet==3.*",

{"golden_diff": "diff --git a/setup.py b/setup.py\n--- a/setup.py\n+++ b/setup.py\n@@ -49,6 +49,7 @@\n     package_data={\"httpx\": [\"py.typed\"]},\n     packages=get_packages(\"httpx\"),\n     include_package_data=True,\n+    zip_safe=False,\n     install_requires=[\n         \"certifi\",\n         \"chardet==3.*\",\n", "issue": "Missing py.typed declaration?\n`mypy` is complaining about not being able to find type annotations for `httpx`: \r\n\r\n`error: Cannot find module named 'httpx'`\r\n\r\nI'm somewhat new to using type annotations/static type checking in Python, but from the mypy documentation [here](https://mypy.readthedocs.io/en/latest/installed_packages.html#making-pep-561-compatible-packages) it looks like there may be a missing declaration in `setup.py`?\n", "before_files": [{"content": "#!/usr/bin/env python\n# -*- coding: utf-8 -*-\n\nimport re\nfrom pathlib import Path\n\nfrom setuptools import setup\n\n\ndef get_version(package):\n    \"\"\"\n    Return package version as listed in `__version__` in `init.py`.\n    \"\"\"\n    version = Path(package, \"__version__.py\").read_text()\n    return re.search(\"__version__ = ['\\\"]([^'\\\"]+)['\\\"]\", version).group(1)\n\n\ndef get_long_description():\n    \"\"\"\n    Return the README.\n    \"\"\"\n    long_description = \"\"\n    with open(\"README.md\", encoding=\"utf8\") as f:\n        long_description += f.read()\n    long_description += \"\\n\\n\"\n    with open(\"CHANGELOG.md\", encoding=\"utf8\") as f:\n        long_description += f.read()\n    return long_description\n\n\ndef get_packages(package):\n    \"\"\"\n    Return root package and all sub-packages.\n    \"\"\"\n    return [str(path.parent) for path in Path(package).glob(\"**/__init__.py\")]\n\n\nsetup(\n    name=\"httpx\",\n    python_requires=\">=3.6\",\n    version=get_version(\"httpx\"),\n    url=\"https://github.com/encode/httpx\",\n    license=\"BSD\",\n    description=\"The next generation HTTP client.\",\n    long_description=get_long_description(),\n    long_description_content_type=\"text/markdown\",\n    author=\"Tom Christie\",\n    author_email=\"tom@tomchristie.com\",\n    package_data={\"httpx\": [\"py.typed\"]},\n    packages=get_packages(\"httpx\"),\n    include_package_data=True,\n    install_requires=[\n        \"certifi\",\n        \"chardet==3.*\",\n        \"h11==0.8.*\",\n        \"h2==3.*\",\n        \"hstspreload>=2019.8.27\",\n        \"idna==2.*\",\n        \"rfc3986==1.*\",\n    ],\n    classifiers=[\n        \"Development Status :: 3 - Alpha\",\n        \"Environment :: Web Environment\",\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: BSD License\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet :: WWW/HTTP\",\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n    ],\n)\n", "path": "setup.py"}], "after_files": [{"content": "#!/usr/bin/env python\n# -*- coding: utf-8 -*-\n\nimport re\nfrom pathlib import Path\n\nfrom setuptools import setup\n\n\ndef get_version(package):\n    \"\"\"\n    Return package version as listed in `__version__` in `init.py`.\n    \"\"\"\n    version = Path(package, \"__version__.py\").read_text()\n    return re.search(\"__version__ = ['\\\"]([^'\\\"]+)['\\\"]\", version).group(1)\n\n\ndef get_long_description():\n    \"\"\"\n    Return the README.\n    \"\"\"\n    long_description = \"\"\n    with open(\"README.md\", encoding=\"utf8\") as f:\n        long_description += f.read()\n    long_description += \"\\n\\n\"\n    with open(\"CHANGELOG.md\", encoding=\"utf8\") as f:\n        long_description += f.read()\n    return long_description\n\n\ndef get_packages(package):\n    \"\"\"\n    Return root package and all sub-packages.\n    \"\"\"\n    return [str(path.parent) for path in Path(package).glob(\"**/__init__.py\")]\n\n\nsetup(\n    name=\"httpx\",\n    python_requires=\">=3.6\",\n    version=get_version(\"httpx\"),\n    url=\"https://github.com/encode/httpx\",\n    license=\"BSD\",\n    description=\"The next generation HTTP client.\",\n    long_description=get_long_description(),\n    long_description_content_type=\"text/markdown\",\n    author=\"Tom Christie\",\n    author_email=\"tom@tomchristie.com\",\n    package_data={\"httpx\": [\"py.typed\"]},\n    packages=get_packages(\"httpx\"),\n    include_package_data=True,\n    zip_safe=False,\n    install_requires=[\n        \"certifi\",\n        \"chardet==3.*\",\n        \"h11==0.8.*\",\n        \"h2==3.*\",\n        \"hstspreload>=2019.8.27\",\n        \"idna==2.*\",\n        \"rfc3986==1.*\",\n    ],\n    classifiers=[\n        \"Development Status :: 3 - Alpha\",\n        \"Environment :: Web Environment\",\n        \"Intended Audience :: Developers\",\n        \"License :: OSI Approved :: BSD License\",\n        \"Operating System :: OS Independent\",\n        \"Topic :: Internet :: WWW/HTTP\",\n        \"Programming Language :: Python :: 3\",\n        \"Programming Language :: Python :: 3.6\",\n        \"Programming Language :: Python :: 3.7\",\n        \"Programming Language :: Python :: 3.8\",\n    ],\n)\n", "path": "setup.py"}]}