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FIX: fix pickle.load for kinematic expressions #472

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FIX: fix pickle.load for kinematic expressions #472

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23 changes: 23 additions & 0 deletions tests/helicity/test_pickle.py
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Original file line number Diff line number Diff line change
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from __future__ import annotations

import io
import pickle # noqa: S403
from typing import TYPE_CHECKING

import ampform

if TYPE_CHECKING:
from qrules import ReactionInfo

from ampform.helicity import HelicityModel


def test_model_pickling(reaction: ReactionInfo):
"""See https://github.com/ComPWA/ampform/issues/471."""
builder = ampform.get_builder(reaction)
model = builder.formulate()
stream = io.BytesIO()
pickle.dump(model, stream)
stream.seek(0)
loaded_model: HelicityModel = pickle.load(stream) # noqa: S301
assert loaded_model.kinematic_variables == model.kinematic_variables
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