gromadzić sumę elementów na liście

# accumulate sum of elements in list
import itertools					# import python module itertools
st1 = [ 1, 2, 3, 4, 5 ]
sum_list = itertools.accumulate(st1)			# accumulate sum of elements
print(list(sum_list))					# [ 1, 3, 6, 10, 15 ]
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