# idx_binary.py

# idx_binary.py

def idx_binary(binary_string):
    indices = []
    idx = 0
    while 1:
        idx = binary_string.find('1', idx)
        if idx == -1:
            break
        indices.append(idx)
        idx = idx + 1
    return indices

binary_string = '00110100'
indices = idx_binary(binary_string)
print(indices)