Improve speed of hasattr on IDS structures - #140
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olivhoenen merged 1 commit intoAug 6, 2026
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Replace `_path` (which constructs the path including AoS indices) with the static `metadata.path_string` when an attribute cannot be found.
Speeds up the following sample from 110ms to 0.5ms (200x gain):
```python
import timeit
import imas
cp = imas.IDSFactory().core_profiles()
cp.profiles_1d.resize(1000)
def totime():
hasattr(cp.profiles_1d[999], "xyz")
print(timeit.repeat(totime, number=1000))
```
**Changed behaviour:**
Before: `AttributeError: IDS structure 'profiles_1d[999]' has no attribute 'xyz'`
After: `AttributeError: IDS structure 'profiles_1d' has no attribute 'xyz'`
Since the index of an AoS is not relevant for whether an attribute exists or not, I believe this is not a problem.
maarten-ic
requested review from
olivhoenen and
prasad-sawantdesai
as code owners
August 5, 2026 13:57
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Replace
_path(which constructs the path including AoS indices) with the staticmetadata.path_stringwhen an attribute cannot be found.Speeds up the following sample from 110ms to 0.5ms (200x gain):
Changed behaviour:
Before:
AttributeError: IDS structure 'profiles_1d[999]' has no attribute 'xyz'After:AttributeError: IDS structure 'profiles_1d' has no attribute 'xyz'Since the index of an AoS is not relevant for whether an attribute exists or not, I believe this is not a problem.