We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
deprecate `__version__`  attribute
The `__version__` attribute is an old pattern from early in Python packaging. Setuptools eventually made it easier to use the pattern by allowing reading the value from the attribute at build time, and some other build backends have done the same.

However, there's no reason to expose this directly in code anymore. It's usually easier to use feature detection (`hasattr`, `try/except`) instead. `importlib.metadata.version("click")` can be used to get the version at runtime in a standard way, if it's really needed.

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `src/click/__init__.py`
Content:
```
1 """
2 Click is a simple Python module inspired by the stdlib optparse to make
3 writing command line scripts fun. Unlike other modules, it's based
4 around a simple API that does not come with too much magic and is
5 composable.
6 """
7 from __future__ import annotations
8 
9 from .core import Argument as Argument
10 from .core import Command as Command
11 from .core import CommandCollection as CommandCollection
12 from .core import Context as Context
13 from .core import Group as Group
14 from .core import Option as Option
15 from .core import Parameter as Parameter
16 from .decorators import argument as argument
17 from .decorators import command as command
18 from .decorators import confirmation_option as confirmation_option
19 from .decorators import group as group
20 from .decorators import help_option as help_option
21 from .decorators import make_pass_decorator as make_pass_decorator
22 from .decorators import option as option
23 from .decorators import pass_context as pass_context
24 from .decorators import pass_obj as pass_obj
25 from .decorators import password_option as password_option
26 from .decorators import version_option as version_option
27 from .exceptions import Abort as Abort
28 from .exceptions import BadArgumentUsage as BadArgumentUsage
29 from .exceptions import BadOptionUsage as BadOptionUsage
30 from .exceptions import BadParameter as BadParameter
31 from .exceptions import ClickException as ClickException
32 from .exceptions import FileError as FileError
33 from .exceptions import MissingParameter as MissingParameter
34 from .exceptions import NoSuchOption as NoSuchOption
35 from .exceptions import UsageError as UsageError
36 from .formatting import HelpFormatter as HelpFormatter
37 from .formatting import wrap_text as wrap_text
38 from .globals import get_current_context as get_current_context
39 from .termui import clear as clear
40 from .termui import confirm as confirm
41 from .termui import echo_via_pager as echo_via_pager
42 from .termui import edit as edit
43 from .termui import getchar as getchar
44 from .termui import launch as launch
45 from .termui import pause as pause
46 from .termui import progressbar as progressbar
47 from .termui import prompt as prompt
48 from .termui import secho as secho
49 from .termui import style as style
50 from .termui import unstyle as unstyle
51 from .types import BOOL as BOOL
52 from .types import Choice as Choice
53 from .types import DateTime as DateTime
54 from .types import File as File
55 from .types import FLOAT as FLOAT
56 from .types import FloatRange as FloatRange
57 from .types import INT as INT
58 from .types import IntRange as IntRange
59 from .types import ParamType as ParamType
60 from .types import Path as Path
61 from .types import STRING as STRING
62 from .types import Tuple as Tuple
63 from .types import UNPROCESSED as UNPROCESSED
64 from .types import UUID as UUID
65 from .utils import echo as echo
66 from .utils import format_filename as format_filename
67 from .utils import get_app_dir as get_app_dir
68 from .utils import get_binary_stream as get_binary_stream
69 from .utils import get_text_stream as get_text_stream
70 from .utils import open_file as open_file
71 
72 __version__ = "8.2.0.dev0"
73 
74 
75 def __getattr__(name: str) -> object:
76     import warnings
77 
78     if name == "BaseCommand":
79         from .core import _BaseCommand
80 
81         warnings.warn(
82             "'BaseCommand' is deprecated and will be removed in Click 9.0. Use"
83             " 'Command' instead.",
84             DeprecationWarning,
85             stacklevel=2,
86         )
87         return _BaseCommand
88 
89     if name == "MultiCommand":
90         from .core import _MultiCommand
91 
92         warnings.warn(
93             "'MultiCommand' is deprecated and will be removed in Click 9.0. Use"
94             " 'Group' instead.",
95             DeprecationWarning,
96             stacklevel=2,
97         )
98         return _MultiCommand
99 
100     if name == "OptionParser":
101         from .parser import _OptionParser
102 
103         warnings.warn(
104             "'OptionParser' is deprecated and will be removed in Click 9.0. The"
105             " old parser is available in 'optparse'.",
106             DeprecationWarning,
107             stacklevel=2,
108         )
109         return _OptionParser
110 
111     raise AttributeError(name)
112
```
--- 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/src/click/__init__.py b/src/click/__init__.py
--- a/src/click/__init__.py
+++ b/src/click/__init__.py
@@ -69,8 +69,6 @@
 from .utils import get_text_stream as get_text_stream
 from .utils import open_file as open_file
 
-__version__ = "8.2.0.dev0"
-
 
 def __getattr__(name: str) -> object:
     import warnings
@@ -108,4 +106,17 @@
         )
         return _OptionParser
 
+    if name == "__version__":
+        import importlib.metadata
+        import warnings
+
+        warnings.warn(
+            "The '__version__' attribute is deprecated and will be removed in"
+            " Click 9.1. Use feature detection or"
+            " 'importlib.metadata.version(\"click\")' instead.",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return importlib.metadata.version("click")
+
     raise AttributeError(name)

{"golden_diff": "diff --git a/src/click/__init__.py b/src/click/__init__.py\n--- a/src/click/__init__.py\n+++ b/src/click/__init__.py\n@@ -69,8 +69,6 @@\n from .utils import get_text_stream as get_text_stream\n from .utils import open_file as open_file\n \n-__version__ = \"8.2.0.dev0\"\n-\n \n def __getattr__(name: str) -> object:\n     import warnings\n@@ -108,4 +106,17 @@\n         )\n         return _OptionParser\n \n+    if name == \"__version__\":\n+        import importlib.metadata\n+        import warnings\n+\n+        warnings.warn(\n+            \"The '__version__' attribute is deprecated and will be removed in\"\n+            \" Click 9.1. Use feature detection or\"\n+            \" 'importlib.metadata.version(\\\"click\\\")' instead.\",\n+            DeprecationWarning,\n+            stacklevel=2,\n+        )\n+        return importlib.metadata.version(\"click\")\n+\n     raise AttributeError(name)\n", "issue": "deprecate `__version__`  attribute\nThe `__version__` attribute is an old pattern from early in Python packaging. Setuptools eventually made it easier to use the pattern by allowing reading the value from the attribute at build time, and some other build backends have done the same.\r\n\r\nHowever, there's no reason to expose this directly in code anymore. It's usually easier to use feature detection (`hasattr`, `try/except`) instead. `importlib.metadata.version(\"click\")` can be used to get the version at runtime in a standard way, if it's really needed.\n", "before_files": [{"content": "\"\"\"\nClick is a simple Python module inspired by the stdlib optparse to make\nwriting command line scripts fun. Unlike other modules, it's based\naround a simple API that does not come with too much magic and is\ncomposable.\n\"\"\"\nfrom __future__ import annotations\n\nfrom .core import Argument as Argument\nfrom .core import Command as Command\nfrom .core import CommandCollection as CommandCollection\nfrom .core import Context as Context\nfrom .core import Group as Group\nfrom .core import Option as Option\nfrom .core import Parameter as Parameter\nfrom .decorators import argument as argument\nfrom .decorators import command as command\nfrom .decorators import confirmation_option as confirmation_option\nfrom .decorators import group as group\nfrom .decorators import help_option as help_option\nfrom .decorators import make_pass_decorator as make_pass_decorator\nfrom .decorators import option as option\nfrom .decorators import pass_context as pass_context\nfrom .decorators import pass_obj as pass_obj\nfrom .decorators import password_option as password_option\nfrom .decorators import version_option as version_option\nfrom .exceptions import Abort as Abort\nfrom .exceptions import BadArgumentUsage as BadArgumentUsage\nfrom .exceptions import BadOptionUsage as BadOptionUsage\nfrom .exceptions import BadParameter as BadParameter\nfrom .exceptions import ClickException as ClickException\nfrom .exceptions import FileError as FileError\nfrom .exceptions import MissingParameter as MissingParameter\nfrom .exceptions import NoSuchOption as NoSuchOption\nfrom .exceptions import UsageError as UsageError\nfrom .formatting import HelpFormatter as HelpFormatter\nfrom .formatting import wrap_text as wrap_text\nfrom .globals import get_current_context as get_current_context\nfrom .termui import clear as clear\nfrom .termui import confirm as confirm\nfrom .termui import echo_via_pager as echo_via_pager\nfrom .termui import edit as edit\nfrom .termui import getchar as getchar\nfrom .termui import launch as launch\nfrom .termui import pause as pause\nfrom .termui import progressbar as progressbar\nfrom .termui import prompt as prompt\nfrom .termui import secho as secho\nfrom .termui import style as style\nfrom .termui import unstyle as unstyle\nfrom .types import BOOL as BOOL\nfrom .types import Choice as Choice\nfrom .types import DateTime as DateTime\nfrom .types import File as File\nfrom .types import FLOAT as FLOAT\nfrom .types import FloatRange as FloatRange\nfrom .types import INT as INT\nfrom .types import IntRange as IntRange\nfrom .types import ParamType as ParamType\nfrom .types import Path as Path\nfrom .types import STRING as STRING\nfrom .types import Tuple as Tuple\nfrom .types import UNPROCESSED as UNPROCESSED\nfrom .types import UUID as UUID\nfrom .utils import echo as echo\nfrom .utils import format_filename as format_filename\nfrom .utils import get_app_dir as get_app_dir\nfrom .utils import get_binary_stream as get_binary_stream\nfrom .utils import get_text_stream as get_text_stream\nfrom .utils import open_file as open_file\n\n__version__ = \"8.2.0.dev0\"\n\n\ndef __getattr__(name: str) -> object:\n    import warnings\n\n    if name == \"BaseCommand\":\n        from .core import _BaseCommand\n\n        warnings.warn(\n            \"'BaseCommand' is deprecated and will be removed in Click 9.0. Use\"\n            \" 'Command' instead.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _BaseCommand\n\n    if name == \"MultiCommand\":\n        from .core import _MultiCommand\n\n        warnings.warn(\n            \"'MultiCommand' is deprecated and will be removed in Click 9.0. Use\"\n            \" 'Group' instead.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _MultiCommand\n\n    if name == \"OptionParser\":\n        from .parser import _OptionParser\n\n        warnings.warn(\n            \"'OptionParser' is deprecated and will be removed in Click 9.0. The\"\n            \" old parser is available in 'optparse'.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _OptionParser\n\n    raise AttributeError(name)\n", "path": "src/click/__init__.py"}], "after_files": [{"content": "\"\"\"\nClick is a simple Python module inspired by the stdlib optparse to make\nwriting command line scripts fun. Unlike other modules, it's based\naround a simple API that does not come with too much magic and is\ncomposable.\n\"\"\"\nfrom __future__ import annotations\n\nfrom .core import Argument as Argument\nfrom .core import Command as Command\nfrom .core import CommandCollection as CommandCollection\nfrom .core import Context as Context\nfrom .core import Group as Group\nfrom .core import Option as Option\nfrom .core import Parameter as Parameter\nfrom .decorators import argument as argument\nfrom .decorators import command as command\nfrom .decorators import confirmation_option as confirmation_option\nfrom .decorators import group as group\nfrom .decorators import help_option as help_option\nfrom .decorators import make_pass_decorator as make_pass_decorator\nfrom .decorators import option as option\nfrom .decorators import pass_context as pass_context\nfrom .decorators import pass_obj as pass_obj\nfrom .decorators import password_option as password_option\nfrom .decorators import version_option as version_option\nfrom .exceptions import Abort as Abort\nfrom .exceptions import BadArgumentUsage as BadArgumentUsage\nfrom .exceptions import BadOptionUsage as BadOptionUsage\nfrom .exceptions import BadParameter as BadParameter\nfrom .exceptions import ClickException as ClickException\nfrom .exceptions import FileError as FileError\nfrom .exceptions import MissingParameter as MissingParameter\nfrom .exceptions import NoSuchOption as NoSuchOption\nfrom .exceptions import UsageError as UsageError\nfrom .formatting import HelpFormatter as HelpFormatter\nfrom .formatting import wrap_text as wrap_text\nfrom .globals import get_current_context as get_current_context\nfrom .termui import clear as clear\nfrom .termui import confirm as confirm\nfrom .termui import echo_via_pager as echo_via_pager\nfrom .termui import edit as edit\nfrom .termui import getchar as getchar\nfrom .termui import launch as launch\nfrom .termui import pause as pause\nfrom .termui import progressbar as progressbar\nfrom .termui import prompt as prompt\nfrom .termui import secho as secho\nfrom .termui import style as style\nfrom .termui import unstyle as unstyle\nfrom .types import BOOL as BOOL\nfrom .types import Choice as Choice\nfrom .types import DateTime as DateTime\nfrom .types import File as File\nfrom .types import FLOAT as FLOAT\nfrom .types import FloatRange as FloatRange\nfrom .types import INT as INT\nfrom .types import IntRange as IntRange\nfrom .types import ParamType as ParamType\nfrom .types import Path as Path\nfrom .types import STRING as STRING\nfrom .types import Tuple as Tuple\nfrom .types import UNPROCESSED as UNPROCESSED\nfrom .types import UUID as UUID\nfrom .utils import echo as echo\nfrom .utils import format_filename as format_filename\nfrom .utils import get_app_dir as get_app_dir\nfrom .utils import get_binary_stream as get_binary_stream\nfrom .utils import get_text_stream as get_text_stream\nfrom .utils import open_file as open_file\n\n\ndef __getattr__(name: str) -> object:\n    import warnings\n\n    if name == \"BaseCommand\":\n        from .core import _BaseCommand\n\n        warnings.warn(\n            \"'BaseCommand' is deprecated and will be removed in Click 9.0. Use\"\n            \" 'Command' instead.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _BaseCommand\n\n    if name == \"MultiCommand\":\n        from .core import _MultiCommand\n\n        warnings.warn(\n            \"'MultiCommand' is deprecated and will be removed in Click 9.0. Use\"\n            \" 'Group' instead.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _MultiCommand\n\n    if name == \"OptionParser\":\n        from .parser import _OptionParser\n\n        warnings.warn(\n            \"'OptionParser' is deprecated and will be removed in Click 9.0. The\"\n            \" old parser is available in 'optparse'.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return _OptionParser\n\n    if name == \"__version__\":\n        import importlib.metadata\n        import warnings\n\n        warnings.warn(\n            \"The '__version__' attribute is deprecated and will be removed in\"\n            \" Click 9.1. Use feature detection or\"\n            \" 'importlib.metadata.version(\\\"click\\\")' instead.\",\n            DeprecationWarning,\n            stacklevel=2,\n        )\n        return importlib.metadata.version(\"click\")\n\n    raise AttributeError(name)\n", "path": "src/click/__init__.py"}]}