快速排序

from random import randint

def qsort(seq):
    if len(seq) < 2:
        return seq

    middle  = seq[0]
    larger  = []
    smaller = []

    for i in seq[1:]:
       if middle < i:
           larger.append(i)
       else:
            smaller.append(i)

    return qsort(smaller) + [middle] + qsort(larger)



if __name__ == '__main__':
    alist = [randint(1,100) for i in range(20)]
    print(alist)
    print(qsort(alist)