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The -i flag is mixed with custom REPLs in tests #140438

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The -i flag is mixed with custom REPLs in tests#140438
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3.13only security fixes3.14bugs and security fixes3.15bugs and security fixestestsTests in the Lib/test dirtopic-replRelated to the interactive shelltype-bugAn unexpected behavior, bug, or error

Description

@johnslavik
johnslavik
opened on Oct 21, 2025

Bug report

Bug description:

This is an issue for a pre-existing PR #140298.

The problem lies in:

cpython/Lib/test/test_repl.py

Lines 359 to 362 in a8edca6

class TestAsyncioREPL(unittest.TestCase):
def test_multiple_statements_fail_early(self):
user_input = "1 / 0; print(f'afterwards: {1+1}')"
p = spawn_repl("-m", "asyncio")

(I wrote this 😬)

It resorts to spawn_repl that adds -i on top of -m asyncio:

cpython/Lib/test/test_repl.py

Lines 44 to 45 in a8edca6

cmd_line = [stdin_fname, '-I', '-i']
cmd_line.extend(args)

Mixing -i with -m asyncio causes the asyncio REPL to launch first, and then a regular Python REPL--right after the former exits.
This is an expected outcome when -i and -m asyncio are mixed.
I didn't intend this result of the current setup--we want -i^<custom repl args> to run a REPL when testing without a PTY.

CPython versions tested on:

3.15

Operating systems tested on:

Linux

Linked PRs

Activity

  1. johnslavik
    added
    type-bugAn unexpected behavior, bug, or error
    on Oct 21, 2025

  2. johnslavik commented on Oct 21, 2025

    @johnslavik
    johnslavik
    on Oct 21, 2025
    MemberAuthor

    @ZeroIntensity (mentorship) Suggesting labels: topic-repl, tests, 3.13, 3.14, 3.15.

  3. ZeroIntensity
    added
    testsTests in the Lib/test dir
    3.14bugs and security fixes
    topic-replRelated to the interactive shell
    3.15bugs and security fixes
    3.13only security fixes
    on Oct 21, 2025
  4. kumaraditya303
    added a commit that references this issue on Oct 23, 2025

    gh-140438: properly run the asyncio REPL tests (#140298)

    1a3da2c
  5. miss-islington
    added 2 commits that reference this issue on Oct 23, 2025

    pythongh-140438: properly run the asyncio REPL tests (pythonGH-140298)

    9117c34

    pythongh-140438: properly run the asyncio REPL tests (pythonGH-140298)

    d21158a
  6. kumaraditya303
    added 2 commits that reference this issue on Oct 23, 2025

    [3.13] gh-140438: properly run the asyncio REPL tests (GH-140298) (#1…

    adf0c11

    [3.14] gh-140438: properly run the asyncio REPL tests (GH-140298) (#1…

    29c42cc
  7. StanFromIreland
    closed this as completedon Oct 23, 2025
  8. StanFromIreland
    added a commit that references this issue on Dec 6, 2025

    pythongh-140438: properly run the asyncio REPL tests (python#140298)

    0491b53
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    3.13only security fixes3.14bugs and security fixes3.15bugs and security fixestestsTests in the Lib/test dirtopic-replRelated to the interactive shelltype-bugAn unexpected behavior, bug, or error

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