str.format() with nested dictionary

Question

I want to use the str.format() method like this:

my_str = "Username: {username}, User data: {user_data.attribute}".format(**items)

And apply it to items as shown below:

items = {
    "username" : "Peter",
    "user_data" : {
         "attribute" : "foo"
    }}

Is this feasible, and if so, then how? If not, I'm interested in your recommended approach.

Fanniefannin

(you don't need to have Python in the title, the tag python automatically append "python" to the title) – Tenaculum

@Tenaculum It does append the first tag to the title of the webpage (<TITLE> here </TITLE>) but doesn't append it the title of the question – Braun

Exact dupe. – Tenaculum

@Braun But still, it's not encouraged to tag in the title. Meta post. – Tenaculum

... votes are weird. Sometimes dupes are downvoted and sometimes they are upvoted. – Tenaculum

Possible duplicate of How to use string.format with nested dict – Weatherwise

Answer 1

Try it like this:

items = {'username': 'Peter', 'user_data': {'attribute': 'foo'}}

my_str = "Username: {username}, User data: {user_data[attribute]}".format(**items)

>>> my_str
'Username: Peter, User data: foo'

Shoffner

Huh. That works. I didn't expect it to be that easy, many thanks! I hope the question will be helpful to somebody else. – Fanniefannin

@Fanniefannin It was =) – Valuer