#!usr/bin/env python
#encoding:utf-8
from __future__ import division
 
'''
__Author__:沂水寒城
功能：Python实现列表中非负数保留，负数转化为指定的数值
'''
def handle_list_negative_nums(data_list,specificvalue=0):
 '''
 处理列表中的负数，转化为指定的数值
 '''
 res_list=[]
 for one in data_list:
  if one>=0:
   res_list.append(one)
  else:
   res_list.append(specificvalue)
 print 'res_list is:',res_list
 res_list2=map(lambda one: one if one>=0 else specificvalue,data_list)
 print 'res_list2 is:',res_list2
 
if __name__ == '__main__':
 data_list=[1.2,4,5,-9,-0.4,-34,2,3,4,0]
 handle_list_negative_nums(data_list,specificvalue=0)
 handle_list_negative_nums(data_list,specificvalue=9)
 

res_list is: [1.2, 4, 5, 0, 0, 0, 2, 3, 4, 0]
res_list2 is: [1.2, 4, 5, 0, 0, 0, 2, 3, 4, 0]
res_list is: [1.2, 4, 5, 9, 9, 9, 2, 3, 4, 0]
res_list2 is: [1.2, 4, 5, 9, 9, 9, 2, 3, 4, 0]