在python中将参数解析为JSON字符串

Question

I want to do following in my python script:

d = {"dpid": + sys.argv [1] + ,"flow_id" : "flow0001"," "actions":{"output":2}}

Its a JSON string further I am loading in my application, can any help, how should I parse that argument in the string ?

Answer 1

Your code is incorrect. Replace it with:

d  = "{\"dpid\":" + sys.argv[1] + ",\"flow_id\":\"flow0001\",\"actions\":{\"output\":2}}"

Make sure the argument you type is an integer. If you want to parse the json string and get the dpid later, write this (python 3 code):

import json
j = json.loads(d)
print(j['dpid'])

Answer 2

If your file name is test.py Then pass args like below

$ python test.py arg1 arg2 arg3

in test.py file you can access them as string by str(sys.argv[index])

in your scenario

d = '{"dpid":"' + str(sys.argv [1]) +'" ,"flow_id":"flow0001", "actions":{"output":2}}'

then parse that string as below,

import json
obj = json.loads(d)