Fix InvalidOperationError

✅ Solution

InvalidOperationError in Polars arises when an operation is performed on a data type that doesn't support it, such as calculating the mean of strings or checking uniqueness within a list column that the function cannot handle. To fix this, either ensure the data type is appropriate for the operation (e.g., convert strings to numeric before calculating the mean) or use a different function designed for that data type (when available). Alternatively, use `pl.when/otherwise` to filter rows on supported datatypes and dtypes that raise errors should not be processed.