如何在Python中合并两个json字符串? [英] How to merge two json string in Python?
问题描述
我最近开始使用Python,并且尝试将我的JSON字符串之一与现有JSON字符串连接在一起.我也在与Zookeeper合作,所以当我使用Python kazoo库时,我从zookeeper节点获取了现有的json字符串.
I recently started working with Python and I am trying to concatenate one of my JSON String with existing JSON String. I am also working with Zookeeper so I get the existing json string from zookeeper node as I am using Python kazoo library.
# gets the data from zookeeper
data, stat = zk.get(some_znode_path)
jsonStringA = data.decode("utf-8")
如果我打印jsonStringA
,它会给我这样-
if I print jsonStringA
it gives me like this -
{"error_1395946244342":"valueA","error_1395952003":"valueB"}
但是,如果我执行print json.loads(jsonString)
,它会像这样打印出来-
But if I do print json.loads(jsonString)
then it prints out like this -
{u'error_1395946244342': u'valueA', u'error_1395952003': u'valueB'}
此处jsonStringA
将具有我现有的JSON字符串.现在,我有另一个键值对,需要在退出的jsonStringA
-
Here jsonStringA
will have my existing JSON String. Now I have another key-value pair which I need to add in the exiting jsonStringA
-
下面是我的Python代码-
Below is my Python code -
# gets the data from zookeeper
data, stat = zk.get(some_znode_path)
jsonStringA = data.decode("utf-8")
timestamp_in_ms = "error_"+str(int(round(time.time() * 1000)))
node = "/pp/tf/test/v1"
a,b,c,d = node.split("/")[1:]
host_info = "h1"
local_dc = "dc3"
step = "step2"
从Zookeeper中提取后,我现有的jsonStringA
将会是这样-
My existing jsonStringA
will be like this after extracting from zookeeper -
{"error_1395946244342":"valueA","error_1395952003":"valueB"}
现在,我需要将此键值对添加到jsonStringA
-
Now I need to append this key-value pair in the jsonStringA
-
"timestamp_in_ms":"Error Occured on machine "+host_info+" in datacenter "+ local_dc +" on the "+ step +" of process "+ c +"
因此,简而言之,我需要在键值对下面合并-
So in short I need to merge below key-value pair -
"error_1395952167":"Error Occured on machine h1 in datacenter dc3 on the step2 of process test"
因此最终的JSON字符串将如下所示-
So final JSON String will look like this -
{"error_1395946244342":"valueA","error_1395952003":"valueB","error_1395952167":"Error Occured on machine h1 in datacenter dc3 on the step2 of process test"}
这可能吗?
推荐答案
假设a和b是要合并的字典:
Assuming a and b are the dictionaries you want to merge:
c = {key: value for (key, value) in (a.items() + b.items())}
要将字符串转换为python字典,请使用以下命令:
To convert your string to python dictionary you use the following:
import json
my_dict = json.loads(json_str)
更新:使用字符串的完整代码:
Update: full code using strings:
# test cases for jsonStringA and jsonStringB according to your data input
jsonStringA = '{"error_1395946244342":"valueA","error_1395952003":"valueB"}'
jsonStringB = '{"error_%d":"Error Occured on machine %s in datacenter %s on the %s of process %s"}' % (timestamp_number, host_info, local_dc, step, c)
# now we have two json STRINGS
import json
dictA = json.loads(jsonStringA)
dictB = json.loads(jsonStringB)
merged_dict = {key: value for (key, value) in (dictA.items() + dictB.items())}
# string dump of the merged dict
jsonString_merged = json.dumps(merged_dict)
但是我不得不说,总的来说,您试图做的并不是最佳实践.请阅读有关python词典的内容.
But I have to say that in general what you are trying to do is not the best practice. Please read a bit on python dictionaries.
替代解决方案:
jsonStringA = get_my_value_as_string_from_somewhere()
errors_dict = json.loads(jsonStringA)
new_error_str = "Error Ocurred in datacenter %s blah for step %s blah" % (datacenter, step)
new_error_key = "error_%d" % (timestamp_number)
errors_dict[new_error_key] = new_error_str
# and if I want to export it somewhere I use the following
write_my_dict_to_a_file_as_string(json.dumps(errors_dict))
实际上,如果仅使用数组来保存所有错误,就可以避免所有这些情况.
And actually you can avoid all these if you just use an array to hold all your errors.
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