prompt-toolkit hanging

Hi! I'm trying to run prompt-toolkit (the main prompt engine for xonsh shell) and facing with hanging:

# rustpython v0.4.0 (https://github.com/RustPython/RustPython#ebdc033c)
rustpython -m pip install prompt-toolkit

ptk.py:

from prompt_toolkit import prompt
text = prompt("Say something: ")
print("You said:", text)

Run:

~/.cargo/bin/rustpython ptk.py
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I've found that starting from prompt-toolkit==3.0.44 ptk becomes hanging.

ptk <=3.0.41 is working

I've found that this version is working:

rustpython -m pip install prompt-toolkit==3.0.41

ptk 3.0.42:

rustpython -m pip install prompt-toolkit==3.0.42
~/.local/bin/rust-xonsh --no-rc --no-env

Traceback (most recent call last):
  File "/Users/pc/.local/bin/rust-xonsh", line 3, in <module>
    from xonsh.main import main
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 12, in <module>
    import xonsh.procs.pipelines as xpp
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/__init__.py", line 2, in <module>
    from xonsh.procs import proxies  # noqa
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/procs/proxies.py", line 21, in <module>
    import xonsh.tools as xt
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/tools.py", line 55, in <module>
    HAVE_CURSOR_SHAPE = False
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/tools.py", line 45, in <module>
    from prompt_toolkit.cursor_shapes import (
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/__init__.py", line 25, in <module>
    from .application import Application
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/__init__.py", line 3, in <module>
    from .application import Application
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 110, in <module>
    pythonapi.PyOS_getsig.restype = c_void_p
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/ctypes/__init__.py", line 412, in __getattr__
    func = self.__getitem__(name)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/ctypes/__init__.py", line 417, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym failed

ptk 3.0.43

rustpython -m pip install prompt-toolkit==3.0.43
~/.local/bin/rust-xonsh --no-rc --no-env

Traceback (most recent call last):
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 512, in main
    sys.exit(main_xonsh(args))
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 628, in main_xonsh
    postmain(args)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 606, in main_xonsh
    exc_info = sys.exc_info()
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 559, in main_xonsh
    shell.shell.cmdloop()
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/main.py", line 559, in main_xonsh
    shell.shell.cmdloop()
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/shells/ptk_shell/__init__.py", line 436, in cmdloop
    break
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/shells/ptk_shell/__init__.py", line 410, in cmdloop
    line = self.singleline(auto_suggest=auto_suggest)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/xonsh/shells/ptk_shell/__init__.py", line 378, in singleline
    line = self.prompter.prompt(**prompt_args)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/shortcuts/prompt.py", line 1030, in prompt
    inputhook=inputhook,
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 1002, in run
    return asyncio.run(coro)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/runners.py", line 193, in run
    with Runner(debug=debug, loop_factory=loop_factory) as runner:
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/runners.py", line 194, in run
    return runner.run(main)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/runners.py", line 129, in run
    signal.signal(signal.SIGINT, signal.default_int_handler)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/runners.py", line 124, in run
    raise  # CancelledError
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/base_events.py", line 687, in run_until_complete
    return future.result()
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/futures.py", line 203, in result
    raise self._exception.with_traceback(self._exception_tb)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/asyncio/tasks.py", line 314, in __step_run_and_handle_result
    result = coro.send(None)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 865, in run_async
    with ExitStack() as stack:
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 877, in run_async
    stack.enter_context(set_handle_sigint(loop))
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/contextlib.py", line 530, in enter_context
    result = _enter(cm)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/contextlib.py", line 143, in __enter__
    raise RuntimeError("generator didn't yield") from None
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/contextlib.py", line 141, in __enter__
    return next(self.gen)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 810, in set_handle_sigint
    with _restore_sigint_from_ctypes():
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/contextlib.py", line 143, in __enter__
    raise RuntimeError("generator didn't yield") from None
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/contextlib.py", line 141, in __enter__
    return next(self.gen)
  File "/Users/pc/.local/lib/rustpython3.13/site-packages/prompt_toolkit/application/application.py", line 1608, in _restore_sigint_from_ctypes
    pythonapi.PyOS_getsig.restype = c_void_p
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/ctypes/__init__.py", line 412, in __getattr__
    func = self.__getitem__(name)
  File "/Users/pc/.cargo/git/checkouts/rustpython-63090cdce5e18442/ebdc033/crates/pylib/Lib/ctypes/__init__.py", line 417, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym failed

ptk >= 3.0.44

rustpython -m pip install prompt-toolkit==3.0.44
~/.local/bin/rust-xonsh --no-rc --no-env

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prompt-toolkit hanging #6504

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ptk <=3.0.41 is working

ptk 3.0.42:

ptk 3.0.43

ptk >= 3.0.44

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prompt-toolkit hanging #6504

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coderabbitai commented on Dec 25, 2025

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anki-code commented on Dec 25, 2025

ptk <=3.0.41 is working

ptk 3.0.42:

ptk 3.0.43

ptk >= 3.0.44

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