Write a function that returns seperate lists of positive and negative numbers from an input list - Python

[ Write a function that returns seperate lists of positive and negative numbers from an input list ]

def seperate_pn(l):
    pos_list = []
    neg_list = []
    for _ in l:
        if _<0:
            neg_list.append(_)
        else:
            pos_list.append(_)
    return pos_list, neg_list