From d327354b106dcb132f10e2f0698d8ce1126006b8 Mon Sep 17 00:00:00 2001
From: Bruno Alla <alla.brunoo@gmail.com>
Date: Tue, 10 Sep 2024 19:40:18 +0100
Subject: [PATCH] Fix view description inspection in Python 3.13
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Python 3.13 introduced docstrings for None: https://github.com/python/cpython/pull/117813

In Python 3.12, this is an empty string:

```
 ➜ python3.12
Python 3.12.6 (main, Sep 10 2024, 19:06:17) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d = None
>>> d.__doc__
>>>
```

In Python 3.13, it's no longer empty:

```
 ➜ python3.13
Python 3.13.0rc2+ (heads/3.13:660baa1, Sep 10 2024, 18:57:50) [Clang 15.0.0 (clang-1500.3.9.4)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> d = None
>>> d.__doc__
'The type of the None singleton.'
>>>
```

Adding a check in the inspector that get the view description out the view function docstring to catch this edge case.
---
 rest_framework/schemas/inspectors.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/rest_framework/schemas/inspectors.py b/rest_framework/schemas/inspectors.py
index cb880e79d..e027b46a7 100644
--- a/rest_framework/schemas/inspectors.py
+++ b/rest_framework/schemas/inspectors.py
@@ -79,8 +79,9 @@ class ViewInspector:
         view = self.view
 
         method_name = getattr(view, 'action', method.lower())
-        method_docstring = getattr(view, method_name, None).__doc__
-        if method_docstring:
+        method_func = getattr(view, method_name, None)
+        method_docstring = method_func.__doc__
+        if method_func and method_docstring:
             # An explicit docstring on the method or action.
             return self._get_description_section(view, method.lower(), formatting.dedent(smart_str(method_docstring)))
         else: