【python】快速排序

快速排序思想和C++的差不多，主要是通过写排序对python的语法更加了解。

# 快速排序
def qsort(arr, left, right):
    if left >= right:
        return arr
    x = arr[left]
    l = left
    r = right
    while left < right:
        while left < right and arr[right] >= x:
            right -= 1
        arr[left] = arr[right]
        while left < right and arr[left] <= x:
            left += 1
        arr[right] = arr[left]
    arr[right] = x
    qsort(arr, l, left - 1)
    qsort(arr, left + 1, r)
    return arr

print(qsort([9,2,6,7,4,0],0,5))