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]

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