Python找出最小的K个数实例代码

# -*- coding: utf-8 -*- 
""" 
Date: Tue Sep 19 10:50:11 2017 
 
Created by @author: xiaoguibao 
 
E-mail: mingliumengshao@163.com 
 
Content: 找最小的k个数 
 
""" 
def function1(lists,k): 
#  冒泡法 
  length = len(lists) 
  for i in range(k): 
    for j in range(i+1,length): 
      if lists[i] > lists[j]: 
        lists[j],lists[i] = lists[i],lists[j] 
  return lists[0:k] 
 
""" 
思路2 包括2个部分function2_partion和function2 
""" 
 
def function2_partion(lists,left,right): 
  #划分函数处理部分 
  key = lists[left] 
  while left < right: 
    while left < right and lists[right] >= key: 
      right -= 1 
    lists[left] = lists[right] 
    while left < right and lists[left] <= key: 
      left += 1 
    lists[right] = lists[left] 
  lists[right] = key 
  return left 
def function2(lists,k): 
  #划分法主要函数部分 
  length = len(lists) 
  left = 0 
  right = length - 1 
  index = function2_partion(lists,left,right) 
  while k!=index: 
    if index > k-1: 
      right = index-1 
    else: 
      left = index+1 
    index = function2_partion(lists,left,right)  
  return lists[0:k] 
 
def main(): 
  lists = [1,1,6,4,11,9,2,10,3] 
#  print "思路一(冒泡法):",function1(lists,8) 
  print "思路二(划分法):",function2(lists,8) 
if __name__=="__main__": 
  main()