X1262: Cumulative Sum Py

Write a function which creates a cumulative sum of numbers in a list.
This is a sequence of partial sums: the first number is unchanged; the second number is the sum of the first and second; the third number is the sum of the first, second, and third; and so on.

Return the resulting list of cumulative sums.

Examples:

cumulativeSum([1,4,4,7]) -> [1,5,9,16]

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