May 4, 2025 · May 4, 2025 · May 4, 2025 · May 4, 2025
diff --git a/Lib/pdb.py b/Lib/pdb.py
        self.completion_matches = []
        self.state = "dumb"
        self.write_failed = False
        self.multiline_block = False

    def _ensure_valid_message(self, msg):
        # Ensure the message conforms to our protocol.
            self.write_failed = True

    def read_command(self, prompt):
        self.multiline_block = False
        reply = input(prompt)

        if self.state == "dumb":
            return prefix + reply

        # Otherwise, valid first line of a multi-line statement
        self.multiline_block = True
        continue_prompt = "...".ljust(len(prompt))
        while codeop.compile_command(reply, "<stdin>", "single") is None:
            reply += "\n" + input(continue_prompt)

            origline = readline.get_line_buffer()
            line = origline.lstrip()
            stripped = len(origline) - len(line)
            begidx = readline.get_begidx() - stripped
            endidx = readline.get_endidx() - stripped
            if self.multiline_block:
                # We're completing a line contained in a multi-line block.
                # Force the remote to treat it as a Python expression.
                line = "! " + line
            offset = len(origline) - len(line)
            begidx = readline.get_begidx() - offset
            endidx = readline.get_endidx() - offset

            msg = {
                "complete": {
diff --git a/Lib/test/test_remote_pdb.py b/Lib/test/test_remote_pdb.py
            expected_state={"state": "pdb"},
        )

    def test_multiline_completion_in_pdb_state(self):
        """Test requesting tab completions at a (Pdb) continuation prompt."""
        # GIVEN
        incoming = [
            ("server", {"prompt": "(Pdb) ", "state": "pdb"}),
            ("user", {"prompt": "(Pdb) ", "input": "if True:"}),
            (
                "user",
                {
                    "prompt": "...   ",
                    "completion_request": {
                        "line": "    b",
                        "begidx": 4,
                        "endidx": 5,
                    },
                    "input": "    bool()",
                },
            ),
            ("server", {"completions": ["bin", "bool", "bytes"]}),
            ("user", {"prompt": "...   ", "input": ""}),
        ]
        self.do_test(
            incoming=incoming,
            expected_outgoing=[
                {
                    "complete": {
                        "text": "b",
                        "line": "! b",
                        "begidx": 2,
                        "endidx": 3,
                    }
                },
                {"reply": "if True:\n    bool()\n"},
            ],
            expected_completions=["bin", "bool", "bytes"],
            expected_state={"state": "pdb"},
        )

    def test_completion_in_interact_state(self):
        """Test requesting tab completions at a >>> prompt."""
        incoming = [
diff --git a/Misc/NEWS.d/next/Library/2025-05-04-13-46-20.gh-issue-133351.YsZls1.rst b/Misc/NEWS.d/next/Library/2025-05-04-13-46-20.gh-issue-133351.YsZls1.rst
 Fix remote PDB to correctly request tab completions for Python expressions
 from the server when completing a continuation line of a multi-line Python
 block.
Original file line number	Diff line number	Diff line change
Expand Up		@@ -2933,6 +2933,7 @@ def __init__(self, pid, sockfile, interrupt_script):
		self.completion_matches = []
		self.state = "dumb"
		self.write_failed = False
		self.multiline_block = False

		def _ensure_valid_message(self, msg):
		# Ensure the message conforms to our protocol.
Expand DownExpand Up		@@ -2979,6 +2980,7 @@ def _send(self, **kwargs):
		self.write_failed = True

		def read_command(self, prompt):
		self.multiline_block = False
		reply = input(prompt)

		if self.state == "dumb":
Expand All		@@ -3003,6 +3005,7 @@ def read_command(self, prompt):
		return prefix + reply

		# Otherwise, valid first line of a multi-line statement
		self.multiline_block = True
		continue_prompt = "...".ljust(len(prompt))
		while codeop.compile_command(reply, "<stdin>", "single") is None:
		reply += "\n" + input(continue_prompt)
Expand DownExpand Up		@@ -3105,9 +3108,13 @@ def complete(self, text, state):

		origline = readline.get_line_buffer()
		line = origline.lstrip()
		stripped = len(origline) - len(line)
		begidx = readline.get_begidx() - stripped
		endidx = readline.get_endidx() - stripped
		if self.multiline_block:
		# We're completing a line contained in a multi-line block.
		# Force the remote to treat it as a Python expression.
		line = "! " + line
		offset = len(origline) - len(line)
		begidx = readline.get_begidx() - offset
		endidx = readline.get_endidx() - offset

		msg = {
		"complete": {
Expand Down
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,3 @@
		Fix remote PDB to correctly request tab completions for Python expressions
		from the server when completing a continuation line of a multi-line Python
		block.