str.format()与嵌套字典

Question

我想使用str.format()方法,如下所示:

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

并将其应用于项目,如下所示:

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

这是可行的,如果是的话,那怎么样？如果没有,我对你推荐的方法感兴趣.

Answer 1

试试这样:

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'