how to parse multiple values with same object?

Question

I want to parse the vaule of user from json response and send email to those id`s using python2.7

I can send it to one user, but not sure how to embed multiple users

role = {
    "permissions": [],
    "principals": [
        {
            "username": "[email protected]",
            "fullname": "null"
        },
        {
            "username": "[email protected]",
            "fullname": "null"
        }
    ]
}

role = json.loads(role)
for item in role['principals']:
    p = item['username']
    print(p)

It is printing as below:

[email protected]
[email protected]

Expected output:

['[email protected]','[email protected]']

Answer 1

You can use list comprehension:

p = [item['username'] for item in role['principals']]
print(p)

Safe variant (won't raise error if key doesn't exist):

result = []
for item in role.get('principals', []):
    p = item.get('username', None)
    if p:
        result.append(p)
print(result)

Safe list comprehension:

result = [item['username'] for item in role.get('principals', []) if 'username' in item]