Handle empty string input; Add test; Improve news entry

Author: tanloong

Lib/sqlite3/__main__.py

@@ -48,6 +48,8 @@ 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.
         """
+        if not source or source.isspace():
+            return False
         if source[0] == ".":
             match source[1:].strip():
                 case "version":

Lib/test/test_sqlite3/test_cli.py

@@ -116,15 +116,28 @@ def test_interact_version(self):
         self.assertEqual(out.count(self.PS2), 0)
         self.assertIn(sqlite3.sqlite_version, out)
 
-    def test_interact_dot_commands(self):
-        # test dot commands with whitespaces and unknow dot commands
-        out, err = self.run_cli(commands=(".version ", ". version", ".spam"))
+    def test_interact_empty_input(self):
+        out, err = self.run_cli(commands=("", " "))
+        self.assertIn(self.MEMORY_DB_MSG, err)
+        self.assertEndsWith(out, self.PS1)
+        self.assertEqual(out.count(self.PS1), 3)
+        self.assertEqual(out.count(self.PS2), 0)
+
+    def test_interact_dot_commands_unknown(self):
+        out, err = self.run_cli(commands=(".unknown_command",))
+        self.assertIn(self.MEMORY_DB_MSG, err)
+        self.assertEndsWith(out, self.PS1)
+        self.assertEqual(out.count(self.PS1), 2)
+        self.assertEqual(out.count(self.PS2), 0)
+        self.assertIn("Error: unknown command or invalid arguments", out)
+
+    def test_interact_dot_commands_with_whitespaces(self):
+        out, err = self.run_cli(commands=(".version ", ". version"))
         self.assertIn(self.MEMORY_DB_MSG, err)
         self.assertEqual(out.count(sqlite3.sqlite_version + "\n"), 2)
         self.assertEndsWith(out, self.PS1)
-        self.assertEqual(out.count(self.PS1), 4)
+        self.assertEqual(out.count(self.PS1), 3)
         self.assertEqual(out.count(self.PS2), 0)
-        self.assertIn("Error", out)
 
     def test_interact_valid_sql(self):
         out, err = self.run_cli(commands=("SELECT 1;",))

Misc/NEWS.d/next/Library/2025-05-05-22-11-24.gh-issue-133439.LpmyFz.rst

@@ -1,2 +1,2 @@
-fix dot commands with trailing spaces are mistaken for multi-line SQL
-statements in the sqlite3 command-line interface
+Fix dot commands with trailing spaces are mistaken for multi-line SQL
+statements in the sqlite3 command-line interface.