gh-133439: fix dot commands with trailing spaces are not recognized in sqlite3 CLI

Author: tanloong

Lib/sqlite3/__main__.py

@@ -48,6 +48,7 @@ def runsource(self, source, filename="<input>", symbol="single"):
         Return True if more input is needed; buffering is done automatically.
         Return False if input is a complete statement ready for execution.
         """
+        source = source.strip()
         match source:
             case ".version":
                 print(f"{sqlite3.sqlite_version}")

Lib/test/test_sqlite3/test_cli.py

@@ -110,6 +110,15 @@ def test_interact_version(self):
         self.assertEqual(out.count(self.PS2), 0)
         self.assertIn(sqlite3.sqlite_version, out)
 
+    def test_interact_whitespace_stripping(self):
+        out, err = self.run_cli(commands=(" " + ".version" + " ",))
+        self.assertIn(self.MEMORY_DB_MSG, err)
+        self.assertIn(sqlite3.sqlite_version + "\n", out)
+        self.assertEndsWith(out, self.PS1)
+        self.assertEqual(out.count(self.PS1), 2)
+        self.assertEqual(out.count(self.PS2), 0)
+        self.assertIn(sqlite3.sqlite_version, out)
+
     def test_interact_valid_sql(self):
         out, err = self.run_cli(commands=("SELECT 1;",))
         self.assertIn(self.MEMORY_DB_MSG, err)