[dict] contains and extract value

[huangweiwu]

How to check if a nanobind::dict object contains a key and extract its value as a specified type like float?
Is there any way like the code below?

nanobind::dict d;
if (d.contains("key"))
{
float v = d.value("key");
}

[wjakob]

instead of .value, use operator[]. The contains function was indeed missing, I added in commit 654dbaa just now.

[huangweiwu]

The contains function works now!
The operator[] returns an accessor, how to get the result? nanobind::cast?

[wjakob]

The accessor supports implicit conversion to nb::object, so you can simply assign it to such a variable.

[gillesdegottex]

Just as a follow up for anyone stumbling on this. This works:

float value = nb::cast<float>(nb::object(kwargs["key"]));

both for arguments key=1 or key=1.0 (which is handy for code flexibility)