fix(python): clear error message when trying to serialize function #824
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A common error seems to be to try to pass a function as a parameter
into a JSII call (have seen 3 occurrences of this in the last week).
Previously, this call would fail when trying to assing the
__jsii_type__
property to the function object.Specifically catch this case to give a helpful error message.
Fixes aws/aws-cdk#4064.
Related to #806
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