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new 93e28d1126 [BugFix][TVMScript] Fix invalid f-string format spec
causing TypeError on Python 3.14 (#19362)
93e28d1126 is described below
commit 93e28d1126d41158e440fc42db427e7358f30f44
Author: Soowon Jeong <[email protected]>
AuthorDate: Tue Apr 7 03:49:23 2026 +0900
[BugFix][TVMScript] Fix invalid f-string format spec causing TypeError on
Python 3.14 (#19362)
## Problem
On Python 3.14, any use of TVMScript raises a `TypeError` before the
module body is even parsed:
```
TypeError: unsupported format string passed to type.__format__
```
The traceback points to
`python/tvm/script/parser/core/diagnostics.py:120`:
```python
raise TypeError(f"Source for {obj:!r} not found")
```
## Root Cause
`{obj:!r}` is an invalid f-string expression. The `:` introduces a
`format_spec`, so `!r` is passed to `type.__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](https://peps.python.org/pep-0701/) 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
```diff
- raise TypeError(f"Source for {obj:!r} not found")
+ raise TypeError(f"Source for {obj!r} not found")
```
One character change. Valid across all Python versions >= 3.6.
## Testing
Verified on Python 3.14.2 (darwin/arm64):
- TVMScript `ir_module` + `prim_func` parses and compiles correctly
after the fix
- Full TVMScript test suite: **628 passed, 1 xfailed** (the 1 failure in
`test_tvmscript_roundtrip.py::test_roundtrip[relax_symbolic_size_var]`
is pre-existing and unrelated to this change)
---
python/tvm/script/parser/core/diagnostics.py | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/python/tvm/script/parser/core/diagnostics.py
b/python/tvm/script/parser/core/diagnostics.py
index 4e5ca08aae..4a6b2574c6 100644
--- a/python/tvm/script/parser/core/diagnostics.py
+++ b/python/tvm/script/parser/core/diagnostics.py
@@ -117,7 +117,7 @@ def _patched_inspect_getfile(obj):
if inspect.isfunction(member):
if obj.__qualname__ + "." + member.__name__ == member.__qualname__:
return inspect.getfile(member)
- raise TypeError(f"Source for {obj:!r} not found")
+ raise TypeError(f"Source for {obj!r} not found")
def findsource(obj):
