Edited : how to declare array of struct in Python

Question

EDITED ALL

import struct
from collections import namedtuple

FDResult = namedtuple('FDResult', ['DeviceID', 'PageNum'])
#bla = [FDResult(DeviceID='NR0951113', PageNum=[1,2,3,4]),
 #FDResult(DeviceID='NR0951114', PageNum=[17,28,63,64]),
 #FDResult(DeviceID='NR0951115', PageNum=[2,3,4,5])]

bla = [FDResult(DeviceID='NR0951115', PageNum=[1])] #how to declare bla as FDResult array and blank data inside,Length of bla should equal 0
bla.append(FDResult(DeviceID='NR0951112', PageNum=[2])) 
print(len(bla))

bla[0].PageNum.append(16)

how to declare array of struct in Python?
FDResult array and blank data inside,Length of bla should equal 0

ANSWER

FDResult = namedtuple('FDResult', ['DeviceID', 'PageNum'])
#bla = [FDResult(DeviceID='NR0951113', PageNum=[1,2,3,4]),
 #FDResult(DeviceID='NR0951114', PageNum=[17,28,63,64]),
 #FDResult(DeviceID='NR0951115', PageNum=[2,3,4,5])]
NodeList = []

Node = FDResult(DeviceID='NR0951113', PageNum=[1,2,3,4])
NodeList.append(Node)
print(len(NodeList))
NodeList[0].PageNum.append(16)

[See this answer](http://stackoverflow.com/a/2970722/1907098) — Volatility, Feb 06 '13 at 09:15

score 0 · Accepted Answer · answered Feb 06 '13 at 09:31

You can create namedtuple array like this.

from collections import namedtuple

MyStruct = namedtuple('MyStruct', 'Mark nPackLen nFlag nGisIp nPort sData sEnd')

NodeList = []
Node = MyStruct(None, '', '', '', '',  -1, 0)
for id in range(4):
     NodeList.append(Node)

score 0 · Answer 2 · answered Feb 06 '13 at 09:37

0

If length of bla should be zero, just create an empty list:

bla = []

A Python list can contain objects of any type. If bla is only supposed to hold FDResult instances, it is your responsibility as programmer not to put anything else there.

answered Feb 06 '13 at 09:37

Janne Karila

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Edited : how to declare array of struct in Python

EDITED ALL

ANSWER

2 Answers2