May 11, 2025
diff --git a/Lib/_pyrepl/commands.py b/Lib/_pyrepl/commands.py
            r.update_screen()
            r.console.finish()
            raise EOFError
        elif "\n" in b and self.event[-1] == "\004":
            self.finish = True

        for i in range(r.get_arg()):
            if r.pos != len(b):
                del b[r.pos]
diff --git a/Lib/test/test_pyrepl/test_pyrepl.py b/Lib/test/test_pyrepl/test_pyrepl.py
        # Extra stuff (newline and `exit` rewrites) are necessary
        # because of how run_repl works.
        self.assertNotIn(">>> \n>>> >>>", cleaned_output)

 class TestPyReplCtrlD(TestCase):
    def prepare_reader(self, events):
        console = FakeConsole(events)
        config = ReadlineConfig(readline_completer=None)
        reader = ReadlineAlikeReader(console=console, config=config)
        return reader

    def test_ctrl_d_empty_buffer(self):
        """Test that pressing Ctrl+D on empty buffer exits the program"""
        events = [
            Event(evt="key", data="\x04", raw=bytearray(b"\x04")),  # Ctrl+D
        ]
        reader = self.prepare_reader(events)
        with self.assertRaises(EOFError):
            multiline_input(reader)

    def test_ctrl_d_multiline_mode(self):
        """Test that pressing Ctrl+D in multiline mode exits multiline mode"""
        events = itertools.chain(
            code_to_events("def f():\n"),  # Enter multiline mode
            [
                Event(evt="key", data="\x04", raw=bytearray(b"\x04")),  # Ctrl+D
            ],
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, "def f():\n    ")  # Should return current input

    def test_ctrl_d_single_line(self):
        """Test that pressing Ctrl+D in single line mode deletes current character"""
        events = itertools.chain(
            code_to_events("hello"),
            [Event(evt="key", data="left", raw=bytearray(b"\x1bOD"))],  # move left
            [Event(evt="key", data="\x04", raw=bytearray(b"\x04"))],    # Ctrl+D
            code_to_events("\n"),
        )
        reader = self.prepare_reader(events)
        output = multiline_input(reader)
        self.assertEqual(output, "hell")  # Should delete the last character
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-05-11-09-40-19.gh-issue-133400.zkWla8.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-05-11-09-40-19.gh-issue-133400.zkWla8.rst
 Fixed Ctrl+D (^D) behavior in _pyrepl module: Now properly exits multiline
 mode when pressed in multiline section. Added test cases to verify the
 behavior in both multiline and single line modes.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -421,6 +421,9 @@ def do(self) -> None:
		r.update_screen()
		r.console.finish()
		raise EOFError
		elif "\n" in b and self.event[-1] == "\004":
		self.finish = True

		for i in range(r.get_arg()):
		if r.pos != len(b):
		del b[r.pos]
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1610,3 +1610,43 @@ def test_prompt_after_help(self):
		# Extra stuff (newline and `exit` rewrites) are necessary
		# because of how run_repl works.
		self.assertNotIn(">>> \n>>> >>>", cleaned_output)

		class TestPyReplCtrlD(TestCase):
		def prepare_reader(self, events):
		console = FakeConsole(events)
		config = ReadlineConfig(readline_completer=None)
		reader = ReadlineAlikeReader(console=console, config=config)
		return reader

		def test_ctrl_d_empty_buffer(self):
		"""Test that pressing Ctrl+D on empty buffer exits the program"""
		events = [
		Event(evt="key", data="\x04", raw=bytearray(b"\x04")), # Ctrl+D
		]
		reader = self.prepare_reader(events)
		with self.assertRaises(EOFError):
		multiline_input(reader)

		def test_ctrl_d_multiline_mode(self):
		"""Test that pressing Ctrl+D in multiline mode exits multiline mode"""
		events = itertools.chain(
		code_to_events("def f():\n"), # Enter multiline mode
		[
		Event(evt="key", data="\x04", raw=bytearray(b"\x04")), # Ctrl+D
		],
		)
		reader = self.prepare_reader(events)
		output = multiline_input(reader)
		self.assertEqual(output, "def f():\n ") # Should return current input

		def test_ctrl_d_single_line(self):
		"""Test that pressing Ctrl+D in single line mode deletes current character"""
		events = itertools.chain(
		code_to_events("hello"),
		[Event(evt="key", data="left", raw=bytearray(b"\x1bOD"))], # move left
		[Event(evt="key", data="\x04", raw=bytearray(b"\x04"))], # Ctrl+D
		code_to_events("\n"),
		)
		reader = self.prepare_reader(events)
		output = multiline_input(reader)
		self.assertEqual(output, "hell") # Should delete the last character
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		Fixed Ctrl+D (^D) behavior in _pyrepl module: Now properly exits multiline
		mode when pressed in multiline section. Added test cases to verify the
		behavior in both multiline and single line modes.