I am puzzled why this is not working. I am trying add my variable value in the JSON and everytime I add it, it is not showing properly in my JSON string.
hostname = "machineA.host.com"
I need to add the above hostname information to the below JSON document -
b"{\"Machine Name\":\"\"+hostname+\"\"}", None, True)
But whenever I am adding it in the above way, it is not working at all.
Not sure what wrong I am doing here?
You're escaping the inner double quote " in your string. It should be:
b"{\"Machine Name\":\""+hostname+"\"}", None, True)
In python you can also use single quotes ' for strings - and you don't need to escape double quotes inside single quoted strings
b'{"Machine Name":"'+hostname+'"}', None, True)
There are two better ways of doing this though. The first is string formatting which inserts a variable into a string:
b'{"Machine Name":"%s"}' % hostname # python 2.x (old way)
b'{{"Machine Name":"{0}"}}'.format(hostname) # python >= 2.6 (new way - note the double braces at the ends)
The next is with the Python JSON module by converting a python dict to a JSON string
>>> hostname = "machineA.host.com"
>>> data = {'Machine Name': hostname}
>>> json.dumps(data)
'{"Machine Name": "machineA.host.com"}'
This is probably the preferred method as it will handle escaping weird characters in your hostname and other fields, ensuring that you have valid JSON at the end.
Is there a reason you're using a bytestring
'{"Machine Name":"{0}"}'.format("yada") Traceback (most recent call last): File "<stdin>", line 1, in <module> KeyError: '"Machine Name"'
.format the outer braces should be doubled up to avoid triggering the format code. '{{"Machine Name":"{0}"}}'.format("yada") I'll fix the above, thanks for pointing it out
% looks more clean when your json variable is nested and has mutiple elemets like b'{"ResourceRecordSet": {"Name": "%s","AliasTarget": {"HostedZoneId": "%s","DNSName": "%s"}}}' % (var1, var2,...)instead of manipulating the string consider having the data as a python structure and then dump it to json
>>> d = {}
>>> d['Machine Name'] = hostname
>>> json.dumps(d)
'{"Machine Name": "machineA.host.com"}'
Please see this example you will get some idea.
test=f"Your order total is $ 150."
{"Total":"'+test+'"}
