Leakage Detector

Flag feature columns whose names suggest data leakage. A column is suspicious when its lower-cased name contains any of the substrings target, label, future, outcome or post_.

Implement solve(columns).

Returns. Return a list of the suspicious column names in their original order. Return an empty list when none match.

Examples

Example 1

Input:

solve(['age', 'income', 'target_encoded', 'future_balance', 'city'])

Output:

['target_encoded', 'future_balance']

Example 2

Input:

solve(['Age', 'Plan', 'tenure'])

Output:

[]