Question

def gravitate(nums, direction):

• Description:
  o Apply "sideways gravity" to nums by combining all the numbers in toone , placing the result on one

  side in some direction, replacing all the other numbers with zeroes. Also return nums when done.

• Assumptions:

  o nums is a two-dimensional list of numbers (floats, or integers)

  o direction is a string, either "left" or "right"

• Restrictions:

  o You need to modify the list in-place, and also return it.

• Updates:

o We'd not intended it, but it's okay to use sum() on this function. You'll still need to do

modifications in-place, which was the point of the question.

o We changed one test case to avoid problematic floating point approximation issues.

• Examples:
o gravitate([[1,2,3],[4,5,6]], "left") o gravitate([[1,2,3],[4,5,6]], "right")

Answer 1

def gravitate(nums, direction):
        for row in nums:
                s = sum(row)
                for i in range(len(row)):
                        row[i] = 0
                if direction == 'left':
                        row[0] = s
                else:
                        row[-1] = s

        return nums


print(gravitate([[1,2,3],[4,5,6]], "left"))
print(gravitate([[1,2,3],[4,5,6]], "right"))

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