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gh-119102: Fix REPL for dumb terminal #119269

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merged 1 commit into from
May 21, 2024
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gh-119102: Fix REPL for dumb terminal #119269

merged 1 commit into from
May 21, 2024

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vstinner
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@vstinner vstinner commented May 20, 2024 •
edited by bedevere-app bot
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Move CAN_USE_PYREPL variable from _pyrepl.main to _pyrepl and rename it to _CAN_USE_PYREPL. Use the variable in the site module to decide if _pyrepl.write_history_file() can be used.

@bedevere-app bedevere-app bot mentioned this pull request May 20, 2024
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cc @pablogamboa @ambv

eugenetriguba
eugenetriguba reviewed May 20, 2024
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Lib/site.py Outdated
try:
if os.getenv("PYTHON_BASIC_REPL"):
if os.getenv("PYTHON_BASIC_REPL") or not _pyrepl._CAN_USE_PYREPL:
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question: This is working, I presume, because we're hitting the except block in __main__ when we have a dumb TERM setting? I was initially a bit confused because I wasn't seeing why an extra conditional on a setting for a win32 check would fix this

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_pyrepl._CAN_USE_PYREPL is set to False if pyrepl fails at startup.

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@ambv: Do you have an idea on how to fix mypy?

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eugenetriguba commented May 21, 2024 •
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@vstinner Using from . import _CAN_USE_PYREPL instead of import _pyrepl seems to work. Not sure if there is a better solution It seems to work in that it makes mypy happy, but it wouldn't allow updating the variable in the other module 🙂

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@vstinner Using from . import _CAN_USE_PYREPL instead of import _pyrepl seems to work.

In that case, _CAN_USE_PYREPL = False only sets the variable in __main__.py, not in __init__.py.

@vstinner
pythongh-119102: Fix REPL for dumb terminal
37dc157 
Use CAN_USE_PYREPL of _pyrepl.__main__ in the site module to decide
if _pyrepl.write_history_file() can be used.
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I rewrote the fix to please the typing gods.

@vstinner vstinner merged commit 73f4a58 into python:main May 21, 2024
@vstinner vstinner deleted the pyrepl_dumb branch May 21, 2024 12:53
@vstinner vstinner added the needs backport to 3.13 bugs and security fixes label May 21, 2024
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Thanks @vstinner for the PR 🌮🎉.. I'm working now to backport this PR to: 3.13.
🐍🍒⛏🤖

miss-islington pushed a commit to miss-islington/cpython that referenced this pull request May 21, 2024
@vstinner @miss-islington
pythongh-119102: Fix REPL for dumb terminal (pythonGH-119269)
35c9446 
Use CAN_USE_PYREPL of _pyrepl.__main__ in the site module to decide
if _pyrepl.write_history_file() can be used.
(cherry picked from commit 73f4a58)

Co-authored-by: Victor Stinner <[email protected]>
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bedevere-app bot commented May 21, 2024

GH-119308 is a backport of this pull request to the 3.13 branch.

@bedevere-app bedevere-app bot removed the needs backport to 3.13 bugs and security fixes label May 21, 2024
vstinner added a commit that referenced this pull request May 21, 2024
@miss-islington @vstinner
[3.13] gh-119102: Fix REPL for dumb terminal (GH-119269) (#119308)
f028451 
gh-119102: Fix REPL for dumb terminal (GH-119269)

Use CAN_USE_PYREPL of _pyrepl.__main__ in the site module to decide
if _pyrepl.write_history_file() can be used.
(cherry picked from commit 73f4a58)

Co-authored-by: Victor Stinner <[email protected]>
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I rewrote the fix to please the typing gods.

@vstinner the new version doesn't seem to fix the issue for me (tested on Fedora 39).

I've ran into the same problem when I was trying to fix this. It looks like from _pyrepl.__main__ import CAN_USE_PYREPL re-executes the code in __main__, and therefore CAN_USE_PYREPL will always be True on non-windows systems.

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Same behavior for me that @danielhollas described.

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Sorry, I didn't retest functionally after fixing mypy 😬

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Please check my second fix: PR gh-119332.

@ambv ambv added the topic-repl Related to the interactive shell label May 23, 2024
@JelleZijlstra JelleZijlstra mentioned this pull request May 28, 2024
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estyxx pushed a commit to estyxx/cpython that referenced this pull request Jul 17, 2024
@vstinner @estyxx
pythongh-119102: Fix REPL for dumb terminal (python#119269)
c620799 
Use CAN_USE_PYREPL of _pyrepl.__main__ in the site module to decide
if _pyrepl.write_history_file() can be used.
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@pablogsal pablogsal pablogsal approved these changes

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