Revert repo-wide formatter changes outside the article folder (#803)

A repo-wide `ruff format` run reformatted 14 files belonging to 13
unrelated tutorials. Because pyproject.toml sets target-version = "py314",
ruff applied PEP 758 and stripped the parentheses from multi-exception
except clauses in 9 published sample files:

    except (ZeroDivisionError, ValueError):   ->   except ZeroDivisionError, ValueError:

That syntax is valid on Python 3.14 but a SyntaxError on 3.13 and earlier,
so those materials would stop running for most readers - and the CI matrix
is Python 3.14 only, so it stays green either way.

Reverts all 14 files to master. No changes to cursor-vs-copilot-python/.

Co-authored-by: RPBot <dan+rpbot@realpython.com>

Author: realpython-bot

asyncio-walkthrough/areq.py

@@ -74,7 +74,7 @@ async def parse(url: str, session: ClientSession, **kwargs) -> set:
             try:
                 # Ensure we return an absolute path.
                 abslink = urllib.parse.urljoin(url, link)
-            except urllib.error.URLError, ValueError:
+            except (urllib.error.URLError, ValueError):
                 logger.exception("Error parsing URL: %s", link)
                 pass
             else:

cursor-vs-windsurf-python/prompts.md

@@ -62,8 +62,6 @@ Type this into a file and let each editor complete it:
 @dataclass
 class RetryMetadata:
     attempts_made: int
-
-
 # ...
 ```
 

django-pagination/README.md

@@ -67,6 +67,7 @@ Add the Python keywords to your database:
 >>> for kw in keyword.kwlist:
 ...     k = Keyword(name=kw)
 ...     k.save()
+...
 ```
 
 Verify that the keywords were added to your database:

flask-connexion-rest-part-2/README.md

@@ -51,6 +51,7 @@ Navigate inside the `rp_flask_api/`, enter the [Python interactive shell](https:
 >>> for person_data in people:
 ...     insert_cmd = f"INSERT INTO person VALUES ({person_data})"
 ...     conn.execute(insert_cmd)
+...
 <sqlite3.Cursor object at 0x104ac4dc0>
 <sqlite3.Cursor object at 0x104ac4f40>
 <sqlite3.Cursor object at 0x104ac4fc0>

flush-print/README.md

@@ -42,7 +42,7 @@ SLIGHTLY_TOO_LARGE_FOR_BUFFER = 80_000
 # Script paused at 10919
 
 bufsize = 80_000 - 10919
-print(bufsize)  # 69081 <-- Your buffer size approximation
+print(bufsize) # 69081 <-- Your buffer size approximation
 ```
 
 You can divide the number you get by `1000` to get an estimation of your buffer size for stdout in kilobytes. In the example above, on a macOS system with a M1 chip, the buffer size of stdout when interacting with it through Python's `print()` would therefore be approximately 69 kilobytes.

python-copy/benchmark.py

@@ -32,7 +32,7 @@ def benchmark(container, executions):
 def sliceable(instance):
     try:
         instance[0:1]
-    except TypeError, KeyError:
+    except (TypeError, KeyError):
         return False
     else:
         return True

python-eval-mathrepl/mathrepl.py

@@ -53,7 +53,7 @@ def main():
         # Read user's input
         try:
             expression = input(f"{PS1} ")
-        except KeyboardInterrupt, EOFError:
+        except (KeyboardInterrupt, EOFError):
             raise SystemExit()
 
         # Handle special commands

python-import/namespace_package/local/serializers/factory.py

@@ -7,7 +7,7 @@ def get_serializer(format):
     try:
         module = importlib.import_module(f"serializers.{format}")
         serializer = getattr(module, f"{format.title()}Serializer")
-    except ImportError, AttributeError:
+    except (ImportError, AttributeError):
         raise ValueError(f"Unknown format {format!r}") from None
 
     return serializer()

python-import/population_quiz/population_quiz.py

@@ -46,7 +46,7 @@ def run_quiz(population, num_questions, num_countries):
             try:
                 guess_idx = int(guess_str) - 1
                 guess = countries[guess_idx]
-            except ValueError, IndexError:
+            except (ValueError, IndexError):
                 print(f"Please answer between 1 and {num_countries}")
             else:
                 break

python-multiple-exceptions/exception_pass.py

@@ -1,5 +1,5 @@
 try:
     with open("file.txt", mode="rt") as f:
         print(f.readlines())
-except FileNotFoundError, PermissionError:
+except (FileNotFoundError, PermissionError):
     pass