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Bug description:
With any JSON Lines file, such as:
❯ cat input.jsonl
{"ingredients":["frog", "water", "chocolate", "glucose"]}
{"ingredients":["chocolate","steel bolts"]}This works on Python 3.12:
❯ python3.12 --version
Python 3.12.10
❯ python3.12 -m json.tool --json-lines input.jsonl
{
"ingredients": [
"frog",
"water",
"chocolate",
"glucose"
]
}
{
"ingredients": [
"chocolate",
"steel bolts"
]
}But not 3.13 or higher:
❯ python3.13 --version
Python 3.13.3
❯ python3.13 -m json.tool --json-lines input.jsonl
I/O operation on closed file.
❯ python3.14 --version
Python 3.14.0a7
❯ python3.14 -m json.tool --json-lines input.jsonl
I/O operation on closed file.
❯ ./python.exe --version --version
Python 3.14.0a7+ (heads/main:e42bda94411, Apr 17 2025, 14:59:38) [Clang 16.0.0 (clang-1600.0.26.6)]
❯ ./python.exe Lib/test/test_json/test_tool.py -h
❯ ./python.exe -m json.tool --json-lines input.jsonl
I/O operation on closed file.CPython versions tested on:
3.13, 3.14, CPython main branch
Operating systems tested on:
macOS, Linux
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bugs and security fixesbugs and security fixesbugs and security fixesbugs and security fixesPython modules in the Lib dirPython modules in the Lib dirAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error