Fix Python 3.14 compatibility: RuntimeError in BaseSettings iteration#1123
Merged
maartenbreddels merged 1 commit intowidgetti:masterfrom Nov 10, 2025
Merged
Fix Python 3.14 compatibility: RuntimeError in BaseSettings iteration#1123maartenbreddels merged 1 commit intowidgetti:masterfrom
maartenbreddels merged 1 commit intowidgetti:masterfrom
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Python 3.14 enforces stricter rules around dictionary mutation during iteration. The BaseSettings class in minisettings.py was modifying cls.__dict__ via setattr() while iterating over it, causing a RuntimeError. Fixed by creating a snapshot of dictionary items before iteration in both __init_subclass__ and __init__ methods using list(cls.__dict__.items()). Fixes the import error: RuntimeError: dictionary changed size during iteration
Contributor
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Thanks! |
Contributor
Author
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Thanks for merging! Could you tag a new release? Maybe this already solves our problems. |
Contributor
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I just released 1.55, which includes this fix. thanks! |
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Python 3.14 enforces stricter rules around dictionary mutation during iteration. The BaseSettings class in minisettings.py was modifying cls.dict via setattr() while iterating over it, causing a RuntimeError.
Fixed by creating a snapshot of dictionary items before iteration in both init_subclass and init methods using list(cls.dict.items()).
Fixes the import error:
RuntimeError: dictionary changed size during iteration
Closes #1107. Cherrypick from #1108.