gh-149035: Modernize legacy Python patterns in Doc/tutorial/stdlib2.rst

Doc/tutorial/errors.rst

@@ -123,7 +123,7 @@ Handlers only handle exceptions that occur in the corresponding *try clause*,
 not in other handlers of the same :keyword:`!try` statement.  An *except clause*
 may name multiple exceptions, for example::
 
-   ... except RuntimeError, TypeError, NameError:
+   ... except (RuntimeError, TypeError, NameError):
    ...     pass
 
 A class in an :keyword:`except` clause matches exceptions which are instances of the

Doc/tutorial/stdlib2.rst

@@ -178,14 +178,13 @@ tasks in background while the main program continues to run::
 
    class AsyncZip(threading.Thread):
        def __init__(self, infile, outfile):
-           threading.Thread.__init__(self)
+           super().__init__()
            self.infile = infile
            self.outfile = outfile
 
        def run(self):
-           f = zipfile.ZipFile(self.outfile, 'w', zipfile.ZIP_DEFLATED)
-           f.write(self.infile)
-           f.close()
+           with zipfile.ZipFile(self.outfile, 'w', zipfile.ZIP_DEFLATED) as f:
+               f.write(self.infile)
            print('Finished background zip of:', self.infile)
 
    background = AsyncZip('mydata.txt', 'myarchive.zip')