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About the language syntax in featuretools4s file

In advance, I'm glad your effort. the grammar syntax in featruetool4s file look like Scala syntax instead of Python syntax ? but the suffix of the file is .py ,is work???

ValueError("Neither {0} or {1} is in its previous relationships: {2}") was met when table relationships have more than 3 levels (e.g order->goods->brand)

Maybe you forgot to append entity to scanned_entities in the for loop.

for relationship in self.relationships[1:]:
    if parent_col == child_col:
        print('parent_col=child_col:', parent_col, child_col)
        if parent_entity in scannned_entities:
            res = res.join(child_df, on=parent_col)
        elif child_entity in scannned_entities:
            res = res.join(parent_df, on=parent_col)
        else:
            raise ValueError("Neither {0} or {1} is in its previous relationships: {2}"
                .format(parent_entity, child_entity, scannned_entities))  # todo
    else:
        print('parent_col<>child_col:', parent_col, child_col)
        if parent_entity in scannned_entities:
            res = res.join(child_df, res[parent_col] == child_df[child_col])
        elif child_entity in scannned_entities:
            res = res.join(parent_df, res[child_col] == parent_df[parent_col])
        else:
            raise ValueError("Neither {0} or {1} is in its previous relationships: {2}"
                .format(parent_entity, child_entity, scannned_entities))

>  scannned_entities.add(parent_entity)
>  scannned_entities.add(child_entity)

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