1.2.3.4
1.2.5.6
2.4
10.6
变成1.234，1.256，2.4，10.6

  def get_bom_namenum(self, cr, uid, ids, field_name, arg, context=None):

        rvalue={}

        for obj in self.browse(cr,uid,ids,context=None):

           firstnum=''

           centernum=''

           endnum=0.0

           for i in range(len(obj.name.split('.'))):

               if i==0:

                  firstnum=obj.name.split('.')[0]+'.'

               else:

                  centernum+=obj.name.split('.')[i]

           endnum=firstnum+centernum

           rvalue[obj.id]=float(endnum)

        return rvalue

list1=[1.22222,2.3333,3.2222,3.14145,2.025]

sorted(list1)

print sorted(list1)

[1.22222, 2.025, 2.3333, 3.14145, 3.2222]