def merge(array_1 , array_2):
temp = []
while (array_1 and array_2):
if array_1[0] > array_2[0]:
temp.append(array_2[0])
array_2 = array_2[1:]
else:
temp.append(array_1[0])
array_1 = array_1[1:]
if array_1:
temp = temp + array_1
elif array_2:
temp = temp + array_2
return temp
def merge_sort(nums):
if not nums:
raise ValueError("")
if len(nums) == 1:
return nums
mid = len(nums) // 2
slice_1 = nums[0:mid]
slice_2 = nums[mid:]
array_1 = merge_sort(slice_1)
array_2 = merge_sort(slice_2)
return merge(array_1, array_2)
print(merge_sort([3,1,2,6]))
