在Python中编辑字典列表中的值

Question

我有一个python词典列表。字典包含我需要为所有字典更新的“sequenceId”，确保每个sequenceId是均匀的且不可重复。 为了更新SequenceID，我使用了一个for循环，但其行为并不是我所期望的

seqId = 0
for index in range(20):
    FinalNodes[index]['sequenceId'] = seqId
    seqId +=2

print(FinalNodes[7]['sequenceId'])

预期产量：-14

观察到的输出：-38

这是完整的代码snipet

import json
import time

with open('test.json', "r") as json_file:
    data = json.load(json_file)

numberofJobs = 10

NodesList = data['nodes']
nNodes = len(NodesList)
#Divide all node into first, main and last
MainNodes = NodesList[1:nNodes-1]
FirstNode = NodesList[0:1]
LastNode  = NodesList[nNodes-1:nNodes] 

#prepare final nodes
FinalNodes = FirstNode.copy()
for i in range(numberofJobs):
    FinalNodes.extend(MainNodes)
FinalNodes.extend(LastNode)

print(FinalNodes[7]['sequenceId'])

seqId = 0
for index in range(0,20):
    FinalNodes[index]['sequenceId'] = seqId
    seqId +=2
    print(FinalNodes[index]['sequenceId'],index)


print(FinalNodes[7]['sequenceId'])

回路内的输出：-

0 0
2 1
4 2
6 3
8 4
10 5
12 6
14 7
16 8
18 9
20 10
22 11
24 12
26 13
28 14
30 15
32 16
34 17
36 18
38 19

Answer 1

请检查您的FinalNodes字典，因为我运行了相同的代码，它工作正常

FinalNodes= []
for i in range(20):
    FinalNodes.append({"sequenceId":0})
seqId = 0
for index in range(8):
    FinalNodes[index]['sequenceId'] = seqId
    seqId +=2

print(FinalNodes[7]['sequenceId']) #14