prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  Improve our warnings in line with PEP 565
  See astropy/astropy#8465
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `sunpy/util/exceptions.py`
  Content:
  ```
  1 # Licensed under a 3-clause BSD style license - see LICENSE.rst
  2 """
  3 This module contains errors/exceptions and warnings of general use for
  4 sunpy. Exceptions that are specific to a given subpackage should *not*
  5 be here, but rather in the particular subpackage.
  6 """
  7 
  8 class SunpyWarning(Warning):
  9     """
  10     The base warning class from which all Sunpy warnings should inherit.
  11     """
  12 
  13 
  14 class SunpyUserWarning(UserWarning, SunpyWarning):
  15     """
  16     The primary warning class for Sunpy.
  17 
  18     Use this if you do not need a specific sub-class.
  19     """
  20 
  21 
  22 class SunpyDeprecationWarning(SunpyWarning):
  23     """
  24     A warning class to indicate a deprecated feature.
  25     """
  26
  ```
  --- 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/sunpy/util/exceptions.py b/sunpy/util/exceptions.py
  --- a/sunpy/util/exceptions.py
  +++ b/sunpy/util/exceptions.py
  @@ -4,6 +4,8 @@
   sunpy. Exceptions that are specific to a given subpackage should *not*
   be here, but rather in the particular subpackage.
   """
  +import sys
  +
   
   class SunpyWarning(Warning):
       """
  @@ -19,7 +21,11 @@
       """
   
   
  -class SunpyDeprecationWarning(SunpyWarning):
  +# For PEP 565 (https://www.python.org/dev/peps/pep-0565/) compliance.
  +DeprecationClass = DeprecationWarning if sys.version_info >= (3, 7) else FutureWarning
  +
  +
  +class SunpyDeprecationWarning(DeprecationClass, SunpyWarning):
       """
       A warning class to indicate a deprecated feature.
       """
  
verification_info: {"golden_diff": "diff --git a/sunpy/util/exceptions.py b/sunpy/util/exceptions.py\n--- a/sunpy/util/exceptions.py\n+++ b/sunpy/util/exceptions.py\n@@ -4,6 +4,8 @@\n sunpy. Exceptions that are specific to a given subpackage should *not*\n be here, but rather in the particular subpackage.\n \"\"\"\n+import sys\n+\n \n class SunpyWarning(Warning):\n     \"\"\"\n@@ -19,7 +21,11 @@\n     \"\"\"\n \n \n-class SunpyDeprecationWarning(SunpyWarning):\n+# For PEP 565 (https://www.python.org/dev/peps/pep-0565/) compliance.\n+DeprecationClass = DeprecationWarning if sys.version_info >= (3, 7) else FutureWarning\n+\n+\n+class SunpyDeprecationWarning(DeprecationClass, SunpyWarning):\n     \"\"\"\n     A warning class to indicate a deprecated feature.\n     \"\"\"\n", "issue": "Improve our warnings in line with PEP 565\nSee astropy/astropy#8465\n", "before_files": [{"content": "# Licensed under a 3-clause BSD style license - see LICENSE.rst\n\"\"\"\nThis module contains errors/exceptions and warnings of general use for\nsunpy. Exceptions that are specific to a given subpackage should *not*\nbe here, but rather in the particular subpackage.\n\"\"\"\n\nclass SunpyWarning(Warning):\n    \"\"\"\n    The base warning class from which all Sunpy warnings should inherit.\n    \"\"\"\n\n\nclass SunpyUserWarning(UserWarning, SunpyWarning):\n    \"\"\"\n    The primary warning class for Sunpy.\n\n    Use this if you do not need a specific sub-class.\n    \"\"\"\n\n\nclass SunpyDeprecationWarning(SunpyWarning):\n    \"\"\"\n    A warning class to indicate a deprecated feature.\n    \"\"\"\n", "path": "sunpy/util/exceptions.py"}], "after_files": [{"content": "# Licensed under a 3-clause BSD style license - see LICENSE.rst\n\"\"\"\nThis module contains errors/exceptions and warnings of general use for\nsunpy. Exceptions that are specific to a given subpackage should *not*\nbe here, but rather in the particular subpackage.\n\"\"\"\nimport sys\n\n\nclass SunpyWarning(Warning):\n    \"\"\"\n    The base warning class from which all Sunpy warnings should inherit.\n    \"\"\"\n\n\nclass SunpyUserWarning(UserWarning, SunpyWarning):\n    \"\"\"\n    The primary warning class for Sunpy.\n\n    Use this if you do not need a specific sub-class.\n    \"\"\"\n\n\n# For PEP 565 (https://www.python.org/dev/peps/pep-0565/) compliance.\nDeprecationClass = DeprecationWarning if sys.version_info >= (3, 7) else FutureWarning\n\n\nclass SunpyDeprecationWarning(DeprecationClass, SunpyWarning):\n    \"\"\"\n    A warning class to indicate a deprecated feature.\n    \"\"\"\n", "path": "sunpy/util/exceptions.py"}]}