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gh-142948: Fall back to basic REPL if stdout is non-interactive #142951

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gh-142948: Fall back to basic REPL if stdout is non-interactive #142951

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Fallback to basic REPL for non-TTY stdout
johnslavik Dec 18, 2025
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johnslavik Dec 18, 2025
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2 changes: 2 additions & 0 deletions Lib/_pyrepl/main.py
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,8 @@
raise RuntimeError("Windows 10 TH2 or later required")
if not os.isatty(sys.stdin.fileno()):
raise OSError(errno.ENOTTY, "tty required", "stdin")
if not os.isatty(sys.stdout.fileno()):
raise OSError(errno.ENOTTY, "tty required", "stdout")
from .simple_interact import check
if err := check():
raise RuntimeError(err)
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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Library/2025-12-18-20-27-53.gh-issue-142948.dhySDC.rst
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@@ -0,0 +1,3 @@
The new REPL now falls back to basic REPL if stdout is non-interactive.
Previously it could flood the output if such stdout was a broken pipe.
Contributed by Bartosz Sławecki.
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