Sometimes keystrokes are swallowed in the new REPL on Windows

Bug report

Bug description:

Especially when using the meta (ALT) key.

For instance, Alt + b for

cpython/Lib/_pyrepl/reader.py

Line 85 in 6b4e3fe

(r"\M-b", "backward-word"),

the first hit is swallowed in a Windwos Terminal.

It happens, when there is nothing to be read from the console, i.e.

cpython/Lib/_pyrepl/windows_console.py

Line 569 in 6b4e3fe

def wait(self, timeout: float | None) -> bool:

returns False but there is data in self.event_queue. The fix is easy and brings us in sync with

cpython/Lib/_pyrepl/unix_console.py

Lines 434 to 441 in 6b4e3fe

    
               def wait(self, timeout: float | None = None) -> bool: 
        
                   """ 
        
                   Wait for events on the console. 
        
                   """ 
        
                   return ( 
        
                       not self.event_queue.empty() 
        
                       or bool(self.pollob.poll(timeout)) 
        
                   )

.

CPython versions tested on:

3.14, CPython main branch

Operating systems tested on:

Windows

Linked PRs

gh-139262: Prevent swallowing REPL input on Windows (GH-139263)

pythongh-139262: Prevent swallowing REPL input on Windows (pythonGH-1…

[3.14] gh-139262: Prevent swallowing REPL input on Windows (GH-139263) (

[3.13] gh-139262: Prevent swallowing REPL input on Windows (GH-139263) (

Fixed! Thanks for your contribution.

pythongh-139262: Prevent swallowing REPL input on Windows (pythonGH-1…

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Sometimes keystrokes are swallowed in the new REPL on Windows #139262

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Bug description:

CPython versions tested on:

Operating systems tested on:

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	def wait(self, timeout: float \| None = None) -> bool:
	"""
	Wait for events on the console.
	"""
	return (
	not self.event_queue.empty()
	or bool(self.pollob.poll(timeout))
	)

Sometimes keystrokes are swallowed in the new REPL on Windows #139262

Description

Bug report

Bug description:

CPython versions tested on:

Operating systems tested on:

Linked PRs

Activity

ambv commented on Jan 2, 2026

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