python问题追问？

Question

def quicksortHelper(lyst,left,right):

     if left<right:

          pivoLocation = partion(lyst,left,right)

          quicksortHelper(lyst,left,pivoLocation-1)

          quicksortHelper(lyst,pivoLocation+1,right)

问一下quicksortHelper(lyst,left,pivoLocation-1)和quicksortHelper(lyst,left,pivoLocation-1)同时调用，还是等quicksortHelper(lyst,left,pivoLocation-1)执行完成后，再执行quicksortHelper(lyst,pivoLocation+1,right)。谢谢！

Answer 1

语句都是一条一条执行的