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evo-dataframe-diff-report

Compares two pandas DataFrames (old vs new) by a key column to identify deleted rows and modified fields, then exports results as a properly formatted JSON report with NumPy-safe serialization.

tasks-evolved/pdf-excel-diff/environment/skills/evo-dataframe-diff-report/SKILL.md

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Sep 10, 2026
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Apache-2.0

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# evo-dataframe-diff-report

Compares old vs new DataFrames to find deletions and modifications, exports as JSON.

## Key Functions

### find_deleted_employees(df_old, df_new, id_column='ID')
Finds IDs in old but not in new. Returns sorted list of ID strings.

### find_modified_employees(df_old, df_new, id_column='ID', numeric_columns=None, float_tolerance=1e-4)
Finds field-level changes for employees in both DataFrames.
Returns list of dicts: {"id": "EMP00003", "field": "Salary", "old_value": 50020, "new_value": 55010}
Sorted by (id, field).