Use Python🐍to get items that only show up once in a list & preserve order:

singles.py

def get_singles(a_list):
    while a_list:
        x = a_list.pop(0)
        if x in a_list:
            a_list.remove(x)
        else:
            yield x


list(get_singles([0, 1, 1, 2, 3]))
# [0, 2, 3]