Generate non-finite float defaults as valid Python source - #212
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horejsek merged 1 commit intoAug 9, 2026
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A schema default of NaN or infinity was written into the generated
validation function with repr(), which produces the bare names `nan`,
`inf` and `-inf`. Those names do not exist in the generated module's
global state, so compiling such a schema produced a function that raised
`NameError: name 'nan' is not defined` as soon as the default was applied.
Added `repr_default()`, which renders non-finite floats as `float('nan')`
and recurses into lists, tuples and dicts so nested defaults are handled
too; everything else still goes through plain repr(). It is used for both
the default-assignment code and the `definition=` argument of the
generated exceptions, which had the same leak.
Fixes horejsek#101
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Fixes #101
A schema
defaultof NaN or infinity was written into the generated validation function withrepr(), which emits the bare namesnan/inf/-inf. Those names don't exist in the generated module's globals, so compiling such a schema produced a function that raisedNameError: name 'nan' is not definedthe moment the default was applied.Added
repr_default(), which renders non-finite floats asfloat('nan')and recurses into lists/tuples/dicts for nested defaults; everything else still goes through plainrepr(). It's also used for thedefinition=argument of the generated exceptions, which had the same leak.Regression tests in
tests/test_default.pyfail withNameErroron master and pass with the fix; full suite is green (503 passed, 4 skipped).