[BugFix][TVMScript] Fix invalid f-string format spec causing TypeError on Python 3.14#19362
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tlopex merged 3 commits intoapache:mainfrom Apr 6, 2026
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Replace `{obj:!r}` with `{obj!r}` in diagnostics.py. The colon-prefixed
form was treated as a format_spec by the f-string parser, which is invalid.
Python 3.14 re-implemented f-string parsing (PEP 701) and now strictly
validates format specs, causing a TypeError at import time when using
TVMScript on Python 3.14.
The correct syntax for repr() conversion in f-strings is `{obj!r}` (no colon).
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Problem
On Python 3.14, any use of TVMScript raises a
TypeErrorbefore the module body is even parsed:The traceback points to
python/tvm/script/parser/core/diagnostics.py:120:Root Cause
{obj:!r}is an invalid f-string expression. The:introduces aformat_spec, so!ris passed totype.__format__as a format string — which it does not support.The intended syntax for a
repr()conversion is{obj!r}(no colon).Python 3.14 re-implemented f-string parsing under PEP 701 and now strictly validates format specs, surfacing this latent bug. Python 3.10–3.13 silently passed the invalid spec to
__format__and happened not to raise in most code paths, so the bug went unnoticed.Fix
One character change. Valid across all Python versions >= 3.6.
Testing
Verified on Python 3.14.2 (darwin/arm64):
ir_module+prim_funcparses and compiles correctly after the fixtest_tvmscript_roundtrip.py::test_roundtrip[relax_symbolic_size_var]is pre-existing and unrelated to this change)