Get start and end indices of repetitive sequences from a list.

get_sequences.py

def get_ones_coords(lst, repeat_value = 1):
    indices = range(len(lst))
    for key_, group in groupby(indices, key=lambda i: lst[i]):
        if key_ == repeat_value:
            group = list(group)
            yield group[0], group[-1] + 1

lst = [1, 1, 0, 0, 0, 1, 1, 1, 0, 1]
print(list(get_ones_coords(lst)))   # [(0, 2), (5, 8), (9, 10)]