Python中的Foreach循环从json响应中的数组中提取值
Python中的Foreach循环从json响应中的数组中提取值
提问于 2018-07-26 06:19:14
我得到了这个json响应：
{
"properties": {
"basic": {
"bandwidth_class": "",
"failure_pool": "",
"max_connection_attempts": 0,
"max_idle_connections_pernode": 50,
"max_timed_out_connection_attempts": 2,
"monitors": [
"Simple HTTP"
],
"node_close_with_rst": false,
"node_connection_attempts": 3,
"node_delete_behavior": "immediate",
"node_drain_to_delete_timeout": 0,
"nodes_table": [
{
"node": "abc1.prod.local:80",
"priority": 1,
"state": "active",
"weight": 1
},
{
"node": "def1.prod.local:80",
"priority": 1,
"state": "disabled",
"weight": 1
},
{
"node": "ghi1.prod.local:80",
"priority": 1,
"state": "disabled",
"weight": 1
},
{
"node": "jkl1.prod.local:80",
"priority": 1,
"state": "active",
"weight": 1
}
],
"note": "",
"passive_monitoring": true,
"persistence_class": "",
"transparent": false
}
}
}还有这个powershell脚本：
$nodesAarray = "abc1.prod.local:80", "jkl1.prod.local:80"
foreach($node in $nodesArray)
{
$nodes_match_and_enabled = $GetNodesResponse.properties.basic.nodes_table | Where { $_.node -eq $node -and $_.state -eq "active" }
if($nodes_match_and_enabled)
{
Write-Output "$node exists in the pool and active"
}
else
{
Write-Output "$node is either not active or the name mismatches"
$global:invalidNodeArray.Add($node)
}
}在我的powershell脚本中，我循环检查数组中的两个节点是否按值匹配，并且状态是活动的。它的工作方式和我预期的一样。
然而，我正在用Python编写相同的逻辑脚本(我是初学者)，但不确定如何接近它。你知道这个脚本在Python中会是什么样子吗？
回答 3
Stack Overflow用户
回答已采纳
发布于 2018-07-26 06:52:46
首先过滤所有主动节点，然后与节点列表进行比较：
data = json.loads(text)
active_nodes = {
n['node']
for n in data['properties']['basic']['nodes_table']
if n['state'] == 'active'
}
nodes = {"abc1.prod.local:80", "jkl1.prod.local:80"}
for node in nodes:
if node in active_nodes:
print('{} exists in the pool and active'.format(node))
else:
print('{} is either not active or the name mismatches'.format(node))
invalid_nodes = nodes - active_nodesStack Overflow用户
发布于 2018-07-26 06:27:28
应该可以在Python 2或3中工作，我认为：
#!/usr/bin/env python
import sys
import json
res = ""
for line in sys.stdin:
res += line.rstrip()
res_obj = json.loads(res)
nodes = [ 'abc1.prod.local:80', 'jkl1.prod.local:80' ]
invalid_nodes = []
for node in nodes:
try:
found = False
test_node_objs = res_obj['properties']['basic']['nodes_table']
for test_node_obj in test_node_objs:
test_node = test_node_obj['node']
if node == test_node:
found = True
break
if found:
sys.stdout.write("%s exists in the pool and active\n" % (node))
else:
sys.stdout.write("%s is either not active or the name mismatches\n" % (node))
invalid_nodes.append(node)
except KeyError as ke:
sys.stderr.write("malformed response? check input...\n")
pass示例用法：
$ ./parse_response.py < response.jsonStack Overflow用户
发布于 2018-07-26 06:35:00
下面是一个实现：
jsonObj = json.loads(jsonSrc)
expectedNodes = {"abc1.prod.local:80", "jkl1.prod.local:80"}
for node in expectedNodes:
node_table = jsonObj['properties']['basic']['nodes_table']
node_match = list(filter(lambda t_node: node == t_node['node'], node_table))
is_node_matches_and_active = len(node_match) > 0 and node_match[0]['state'] == "active"
if is_node_matches_and_active:
print('node {} exists and is active'.format(node))
else:
print('node {} not found or not active'.format(node))输出：
node jkl1.prod.local:80 exists and is active
node abc1.prod.local:80 exists and is active页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/51528461
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