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[3.13] gh-68453: Fix IDLE -s together with -c, -r or - (GH-157592) #157642

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terryjreedy merged 1 commit into from
Sep 16, 2026
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[3.13] gh-68453: Fix IDLE -s together with -c, -r or - (GH-157592) #157642

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gh-68453: Fix IDLE -s together with -c, -r or - (GH-157592) 
The startup file runs in the subprocess asynchronously, so the command
or script was queued while it was still executing: an "Already
executing" dialog was shown, sys.argv was not set, and the subprocess
was restarted, discarding the startup file. Wait for the startup file
to finish first.
(cherry picked from commit 9cc3547)

Co-authored-by: Serhiy Storchaka <[email protected]>
Co-authored-by: Claude Opus 5 (1M context) <[email protected]>
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@serhiy-storchaka @claude @miss-islington
2 people authored and miss-islington committed Sep 16, 2026
commit 5cc4c6c99d19ddb7693971f119b315214256096b
4 changes: 4 additions & 0 deletions Lib/idlelib/pyshell.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1675,6 +1675,10 @@ def main():
if filename and os.path.isfile(filename):
shell.interp.execfile(filename)
if cmd or script:
# Let the startup file finish first: the command or script
# is to run after it, in its namespace (gh-68453).
while shell.executing:
root.update()
shell.interp.runcommand("""if 1:
import sys as _sys
_sys.argv = {!r}
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/IDLE/2026-09-15-21-20-04.gh-issue-68453.hlxbog.rst
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@@ -0,0 +1,3 @@
Fix running IDLE with the -s option together with -c, -r or -: the command
or script now runs after the startup file, without an error dialog and
without restarting the shell.
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