fix(importance): write importances set on newly created cells#923
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novavale wants to merge 3 commits intoidaholab:developfrom
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fix(importance): write importances set on newly created cells#923novavale wants to merge 3 commits intoidaholab:developfrom
novavale wants to merge 3 commits intoidaholab:developfrom
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March 6, 2026 05:34
…ab#892) Three bugs prevented newly-created cells from having their importances serialized when writing the problem: 1. importance.all setter silently no-oped when the cell was not yet linked to a problem (_problem is None). The intent was lost before cells.append() was called. Fixed by storing the pending value in _pending_all_importance and applying it inside link_to_problem(). 2. importance.all setter raised KeyError for particles that weren't yet in _particle_importances (e.g. photon on a new neutron-only cell). Fixed by calling _generate_default_cell_tree() when the particle is missing, mirroring the existing __setitem__ behaviour. 3. has_information returned False for importances set to the default value (1.0) even when explicitly set by the user. Fixed by also returning True when _explicitly_set is True. Regression tests added for all scenarios from the issue report.
…licit importances Previously the test hardcoded start_idx=6 with a fragile check for the literal string 'imp:n=1', which broke when a programmatically-created cell emits 'IMP:n=1.0' (introduced by the importance fix in this PR). Replace with a robust FILL= token search: locate the word starting with 'FILL=', then skip 2 more range words (j, k), which always lands at the first universe number regardless of what precedes FILL in the line.
…daholab#892 - Apply black formatting to tests/test_importance.py - Add Bugs Fixed entry to 1.3.0 changelog for issue idaholab#892
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Fixes #892
Problem
Three bugs prevented newly-created cells from having their importances serialized when writing the problem:
Bug 1:
importance.allno-ops beforecells.append()When setting
cell.importance.all = 2.0before the cell is added to a problem,self._problemisNoneand the setter silently did nothing. The intent was lost.Bug 2:
importance.allraisesKeyErrorfor missing particlesEven after linking to a problem,
all.setterwould crash withKeyErrorfor particles not yet in_particle_importances(e.g. photon on a freshly created neutron-only cell).Bug 3: Default-value importances not written
has_informationreturnedFalsewhen all importances equal the default (1.0), even if they were explicitly set by the user. This causedc3.importance.neutron = 1.0; c3.importance.photon = 1.0to be silently dropped.Fix
all.setter: When_problemisNone, store the value in_pending_all_importanceand apply it lazily inlink_to_problem(). Also call_generate_default_cell_tree()for any particle not yet present (mirrors existing__setitem__behaviour).link_to_problem()override: Flushes_pending_all_importanceacross all mode particles once the problem is known.has_information: ReturnsTruewhen_explicitly_setisTrue, ensuring default-value importances set programmatically are still written.Testing
4 regression tests added to
tests/test_importance.pycovering every scenario from the issue:importance.allset beforecells.append()test_892_importance_all_before_appendimportance.allset aftercells.append()test_892_importance_all_after_appendtest_892_importance_individual_default_valueimportance.all = 1.0(default) still writtentest_892_importance_all_default_value_still_writtenAll 952 pre-existing tests pass (2 unrelated pre-existing failures:
test_versionandtest_fill_multi_universe_order).📚 Documentation preview 📚: https://montepy--923.org.readthedocs.build/en/923/