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# general

sparse-intern-71089

08/28/2020, 4:55 AM

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many-psychiatrist-74327

08/28/2020, 5:12 AM

It looks like the pulumi engine is returning a dictionary where one of the keys has a list, while it should return a Dict[str, str]. I edited

pulumi/runtime/resource.py

and

pulumi/runtime/rpc.py

to print debugging information. The rpc response is:

Copy code

... omitted for brevity
    fields {
      key: "tags"
      value {
        struct_value {
          fields {
            key: "Name"
            value {
              string_value: "pulumi-eks-vpc"
            }
          }
          fields {
            key: "__defaults"
            value {
              list_value {
              }
            }
          }
        }
      }
    }

And the translation calls that fails:

Copy code

trying to translate value={'Name': 'pulumi-eks-vpc', '__defaults': []} with type=typing.Mapping[str, str]

Doesn’t seem like
'_defaults': []
should be there…

many-psychiatrist-74327

08/28/2020, 6:18 AM

It seems that any resource where I add

tags

will cause pulumi to fail, because the server is returning a

tags

dictionary that always includes

__defaults: []

(list), which causes the property translator to fail, because it expects a

Mapping[str, str]

microscopic-pilot-97530

08/28/2020, 9:47 PM

Yes,

__defaults

is a value coming back from the engine and is something we should be filtering out of the results. We do this for other languages, but looks like we weren’t doing it for Python, and we recently added more type checks in the Python SDK in v2.9.0, which is now resulting in this error. I am going to open an issue and start working on a fix. In the meantime, you can workaround by downgrading you Python package dependencies to