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Hi @rasbt,
This PR addresses Issue #1112, where the association_rules function became broken for many users in v0.23.2 because num_itemsets was changed to a mandatory positional argument. This regression broke existing scripts that relied on the previous API.
Changes Implemented
Changed num_itemsets from a mandatory argument to an optional one by setting its default value to None.
Implemented logic to automatically infer num_itemsets from df_orig if provided.
Set the default to 1 when neither num_itemsets nor df_orig is provided, maintaining backward compatibility with the historical behavior of the library.
Updated error messages to provide better guidance when null_values=True.
Verification
Manual Test: Verified that the reproduction code provided in #1112 now runs successfully without a TypeError.
Automated Tests: Ran pytest mlxtend/frequent_patterns/tests/test_association_rules.py and all tests passed.
Code Quality: Formatted the code using ruff to ensure compliance with the project's styling guidelines.