In this json array:
json_string=[{"Id": "report","Value": "3001"},{"Id": "user","Value": "user123"}]
How can I get back user123 if I pass in user
When I try to do this:
content = json.loads(json_string)
content['user']
I get an error that says you have to use integer to reference an element.
I am brand new to Python.
Thanks!
content is a list so you should get the element by index first:
>>> content[1]['Value']
'user123'
>>> for d in content:
... if 'user' in d.values():
... print d['Value']
'user123'
Assuming user is always mapped to Id:
>>> for d in content:
... if d['Id'] == 'user':
... print d['Value']
One liner:
>>> [d['Value'] for d in content if d['Id'] == 'user'][0]
'user123'
[ x for x in content where x['Id'] == "user"][0]["Value"]
Id always.Assuming you want to focus on the first occurrence of an element in the list with a given field (e.g. 'Id') with a certain value (e.g. 'user'):
def look_for(string, field, val):
return next((el['Value'] for el in string if el[field] == val))
json_string = [{"Id": "report","Value": "3001"}, {"Id": "user","Value": "user123"}]
found_val = look_for(json_string, 'Id', 'user')
produces
'user123'
Obviously, also the output field can become a parameter instead of being hardcoded to Value
