2

I have code that produces a data struicture that looks like this:

{'AttributeId': '4192',
 'AttributeList': '',
 'ClassId': '1014 (AP)',
 'InstanceId': '0',
 'MessageType': '81 (GetAttributesResponse)',
 'ObjectInstance': '',
 'Protocol': 'BSMIS Rx',
 'RDN': '',
 'TransactionId': '66',
 'Sequences': [[],
               [1,'2013-02-26T15:01:11Z'],
               [],
               [10564,13,388,0,-321,83,'272','05',67,67,708,896,31,128,-12,-109,0,-20,-111,-1,-1,0],
               [10564,13,108,0,-11,83,'272','05',67,67,708,1796,31,128,-12,-109,0,-20,-111,-1,-1,0],
               [10589,16,388,0,-15,79,'272','05',67,67,708,8680,31,125,-16,-110,0,-20,-111,-1,-1,0],
               [10589,15,108,0,-16,81,'272','05',67,67,708,8105,31,126,-14,-109,0,-20,-111,-1,-1,0],
               [10637,40,233,0,-11,89,'272','03',30052,1,5,54013,33,103,-6,-76,1,-20,-111,-1,-1,0],
               [10662,46,234,0,-15,85,'272','03',30052,1,5,54016,33,97,-10,-74,1,-20,-111,-1,-1,0],
               [10712,51,12,0,-24,91,'272','01',4013,254,200,2973,3,62,-4,-63,0,-20,-111,-1,-1,0],
               [10737,15,224,0,-16,82,'272','01',3020,21,21,40770,33,128,-13,-108,0,-20,-111,-1,-1,0],
               [10762,14,450,0,-7,78,'272','01',3020,21,21,53215,29,125,-17,-113,0,-20,-111,-1,-1,0],
               [10762,15,224,0,-7,85,'272','01',3020,21,21,50770,33,128,-10,-105,0,-20,-111,-1,-1,0],
               [10762,14,124,0,-7,78,'272','01',3020,10,10,56880,32,128,-17,-113,0,-20,-111,-1,-1,0],
               [10812,11,135,0,-14,81,'272','02',36002,1,11,43159,31,130,-14,-113,1,-20,-111,-1,-1,0],
               [10837,42,23,0,-9,89,'272','02',36002,1,11,53529,31,99,-6,-74,1,-20,-111,-1,-1,0,54],
               [13,'2013-02-26T15:02:09Z'],
               [],
               [2,12,7,0,9,70,'272','02',20003,0,0,15535,0,0,0,0,1,100,100,-1,-1,0],
               [5,15,44,0,-205,77,'272','02',20003,0,0,15632,0,0,0,0,1,100,100,-1,-1,0],
               [7,25,9,0,0,84,'272','02',20002,0,0,50883,0,0,0,0,1,100,100,-1,-1,0]]
}

I then filtered this down to make a list of relevant values, I only wanted the first 2 elements of Sequences if the length was >=22. I did this as follows:

 len22seqs = filter(lambda s: len(s)>=22, data['Sequences'])
 UARFCNRSSI = []
 for i in range(len(len22seqs)):
     UARFCNRSSI.append([len22seqs[i][0], len22seqs[i][1]])

An example of the filtered list is:

 [[10564, 15], [10564, 13], [10589, 18], [10637, 39], [10662, 38], [10712, 50], [10737, 15], [10762, 14], [10787, 9], [10812, 12], [10837, 45], [3, 17], [7, 21], [46, 26], [48, 12], [49, 24], [64, 14], [66, 17], [976, 27], [981, 22], [982, 22], [983, 17], [985, 13], [517, 9], [521, 15], [525, 11], [526, 13], [528, 14], [698, 14], [788, 24], [792, 19]]

However I now note that I need a third element in each of these sub-lists. That is this: 

[1,'2013-02-26T15:01:11Z'],

I need the first element of every list with length of 2 to be appended to this filtered list as a third element, for the elements that follow. But when there is a new list with length 2 then I need that new value to be appended to the subsequent entries.

So my final list example could look like, note the change to 13 for the third element upon finding another list with length 2:

[[10564, 15, 1], [10564, 13, 1], [10589, 18, 1], [10637, 39, 1], [10662, 38, 1], [10837, 45, 1], [3, 17, 13], [7, 21, 13], [46, 26, 13], etc]

How do I do this? Do i have to filter twice with len >=22 and len = 2, and a separate filter for just len >=22 as I wouldn't want to append element 0 or 1 to my final list for the lists with length 2.

4

2 回答 2

4

我会尽量让它可读：

UARFCNRSSI = []
x = None        # future "third element"; please choose a better name
for item in data["Sequences"]:
   if len(item) == 2:
       x = item[0]
   elif len(item) >= 22:
       UARFCNRSSI.append([item[0], item[1], x])
于 2013-04-18T10:48:32.617 回答
3

我会使用生成器来过滤您的数据：

def filterdata(sequences):
    add = []
    for item in sequences:        
        if len(item) == 2:
            add = [item[0]]
        elif len(item) >= 22:
            yield [item[0], item[1]] + add

你可以像访问它data = list(filterdata(data['Sequences']))

于 2013-04-18T10:50:39.877 回答