alifestd_mark_first_child_id_asexual

alifestd_mark_first_child_id_asexual(phylogeny_df: DataFrame, mutate: bool = False, *, mark_as: str = 'first_child_id') → DataFrame

Add column first_child_id, the smallest-id child of each node.

The output column name can be changed via the mark_as parameter.

If a node has no children (is a leaf), marks own id.

A topological sort will be applied if phylogeny_df is not topologically sorted. Dataframe reindexing (e.g., df.index) may be applied.

Input dataframe is not mutated by this operation unless mutate set True. If mutate set True, operation does not occur in place; still use return value to get transformed phylogeny dataframe.