How to make type comparisons?

[danvinci]

Hello!

First of all, thanks for this amazing package - it's saving me headaches!

I've got a question concerning how to make Python-types comparisons from Julia:

I'm using pymongo via PythonCall for querying a MongoDB instance (Mongoc.jl doesn't work as expected), and when mapping back the query results to a Julia Dict, ObjectIds are left behind (all good, it makes sense).

Being the only kind of value that has a "Py" type left in my dictionary, I can simply call 'pystr' + 'pyconvert' for retrieving the ID as a Julia String.

What I'd like, is to make a type check before performing this operation, knowing that in Python their type is:
<class 'bson.objectid.ObjectId'>

Calling pytype on the same object I get:
Python type: <class 'bson.objectid.ObjectId'>

Does anyone encountered a similar problem before?

[cjdoris]

What's the actual question? There is pyissubclass and pyisinstance which you can use to check types.

[danvinci]

Thank you!

My question was about what goes in the function call.

In Julia (with Julia types) I can do:
isa(x, String)

Using PythonCall I'd have to do:
pyisinstance(x, <python type>)

But what I don't know (maybe it's a stupid question) is how to pass the ::Type argument to the function.

I can retrieve an example of variable of the type that I need to make the comparison against, retrieve its type via pytype, and using this "type" as argument - but wondering if there's a more straightforward way knowing the name of the type.

[cjdoris]

Oh I see. You'd get the type just as you would in Python, by importing it from some module. For your particular case the type is pyimport("bson.objectid").ObjectId.

[danvinci]

Thank you, that worked!!