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【Python】几种排序算法

作者:FuniK / 发布于2013/10/11/ 679


	import sys, getopt, random

	def bubble_sort(seq):
	for i in range(len(seq)):
	 for j in range(1,len(seq)):
	 if seq[j-1]>seq[j]:
	 seq[j-1], seq[j]= seq[j], seq[j-1]
	return seq

	def insertion_sort(seq):
	for i in range(1,len(seq)):
	 tmp=seq[i]
	 pos=i;
	 for j in range(i-1,-1,-1):
	 if seq[j]>tmp:
	 seq[j+1]=seq[j]
	 pos=j
	 seq[pos]=tmp
	return seq

	def selection_sort(seq):
	for i in range(len(seq)):
	 min_index=i;
	 for j in range(i,len(seq)):
	 if seq[j]<seq[min_index]:
	 min_index=j
	 seq[i],seq[min_index]=seq[min_index],seq[i]
	return seq

	def partition(seq,p,l,r):
	pivot = seq[p]
	seq[p],seq[r]=seq[r],seq[p]
	p_pos = l
	for i in range(l,r):
	 if seq[i]<=pivot:
	 seq[i],seq[p_pos]=seq[p_pos],seq[i]
	 p_pos=p_pos+1
	seq[p_pos],seq[r]=seq[r],seq[p_pos]
	return p_pos

	
	def quick_sort(seq,left,right):
	if left < right:
	 pivot = random.randint(left,right)
	 mid = partition(seq,pivot,left,right)
	 quick_sort(seq,left,mid-1)
	 quick_sort(seq,mid+1,right)
	return seq

	def shell_sort(seq):
	incr = len(seq)/2
	while(incr>=1):
	 for i in range(incr,len(seq)):
	 tmp=seq[i]
	 pos=i;
	 for j in range(i-incr,-1,-incr):
	 if seq[j]>tmp:
	 seq[j+incr]=seq[j]
	 pos=j
	 seq[pos]=tmp
	 incr = incr/2
	return seq

	def usage():
	print 'Usage: python sort.py sorttype[-q|-i|-b|-s|--shell] sequence'
	print 'Example: python sort.py -q 11,32,3,24,5'

	def main():
	try:
	 if(len(sys.argv)==1) or (len(sys.argv)!=3):
	 raise Exception()
	 else:
	 opts,args=getopt.getopt(sys.argv[1:],'qibs',['shell'])

	 if len(args)>0:
	 seq=[]
	 tmp=args[0].split(',')
	 for i in tmp:
	 seq.append(int(i))
	 else:
	 raise Exception()

	 for opt in opts:
	 if opt[0] =='-q':
	 print quick_sort(seq,0,len(seq)-1)
	 elif opt[0] =='-i':
	 print insertion_sort(seq)
	 elif opt[0] =='-b':
	 print bubble_sort(seq)
	 elif opt[0] =='-s':
	 print selection_sort(seq)
	 elif opt[0] =='--shell':
	 print shell_sort(seq)

	except Exception,e:
	 usage()
	 print e
	 sys.exit()

	if __name__ =="__main__":
	main()

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