Hey everyone, I am trying to write a component library in Python and I'm up to the point of trying to install my package into a project to actually use and I'm getting the following error:

File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/host.py", line 56, in component_provider_host  
    main(ComponentProvider(components, name, namespace, version), args)      
         ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^  
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/component.py", line 61, in __init__ 
    result = self.analyzer.analyze(components)         
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/analyzer.py", line 276, in analyze  
    c = self.analyze_component(component)   
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/analyzer.py", line 355, in analyze_component   
    (inputs, inputs_mapping) = self.analyze_type(args, is_component_output=False)       
         ~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/analyzer.py", line 404, in analyze_type        
    camel_case(k): self.analyze_property(   
        ~~~~~~~~~~~~~~~~~~~~~^   
        v, 
        ^^ 
    ...<3 lines>...   
        is_component_output=is_component_output,       
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^       
    )      
    ^      
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/analyzer.py", line 594, in analyze_property    
    elif is_enum(arg):
         ~~~~~~~^^^^^ 
  File "<home_dir>/venv/lib/python3.13/site-packages/pulumi/provider/experimental/analyzer.py", line 819, in is_enum  
    return issubclass(typ, Enum) 
TypeError: issubclass() arg 1 must be a class

I did some fiddling with the analyzer and I can see that the type it's bombing on is a

Mapping[str, pulumi.Input[str]]

field on one of my objects used to configure the tags on my component. I get this error when I try to install the package from a GitHub repo, but if I clone the repo locally, set up the venv and then point the

pulumi package add

command at the local installed clone then it doesn't seem to have any problems generating SDKs with no code changes on my part. Am I hitting a bug here? What types are in scope when it comes to Pulumi generating valid SDK values from type annotations? I have tried annotated types for other fields and they also seem to cause issues. Just would like to know as debugging these type issues is basically impossible without manually fiddling with the analyzer to dump out the type causing the TypeError to be thrown

Hey @delightful-queen-14969 does it work if types are for instance Mapping[str, str] rather than Mapping[str, pulumi.Input[str]]?

I just tested running

collections.abc.Mapping

through

issubclass

for every Python version since 3.9 and found something very interesting: Python 3.9 - 3.12:

>>> issubclass(collections.abc.Mapping, Enum)
False
>>> issubclass(collections.abc.Mapping[str, str], Enum)
False

Python 3.13:

>>> issubclass(collections.abc.Mapping, Enum)
False
>>> issubclass(collections.abc.Mapping[str, str], Enum)
Traceback (most recent call last):
  File "<python-input-17>", line 1, in <module>
    issubclass(collections.abc.Mapping[str, str], Enum)
    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: issubclass() arg 1 must be a class

So, congrats, @delightful-queen-14969. I think you may have found a bug.

For sure, cheers

I think the issue is around Python 3.13 changing how type annotations work. So that

issubclass()

raises

TypeError

. But I'm not clear why that would change for you based on local vs git.

Yeah, I was reluctant to log the issue immediately because I had no idea what to set as the title. Too many moving bits and I don't want to lead people down the garden path with a wrong description of what the actual cause is