Merge elements in list based on given indices

Question

I want to merge element in the list based on given start and stop index of tuple (non-overlap for tuple). I\'ll leave the indices that don\'t mention as it is. This is my ex

Answer 1

Short "trick" with reversed merge list:

ls = ['1', '2', '3', '4', '5', '6', '7']
merge = [(1, 3), (5, 7)]

for t in merge[::-1]:
    merged = ''.join(ls[t[0]:t[1]])  # merging values within a range
    ls[t[0]:t[1]] = [merged]         # slice replacement

print(ls)

The output:

['1', '23', '4', '5', '67']