Typcasting with typing._GenericAlias fails

[stephen-bunn]

In some use cases typing types are considered to be typing._GenericAlias subclasses instead of typing.GenericMeta. In these cases the type.__extra__ attribute is not defined as it is not considered to be part of the typing module. However the type.__origin__ attribute contains the same needed data.

(type.__args__ is the same no matter what)

This can be mitigated by trying __extra__ first (as that is the more likely scenario) and catching AttributeError in order to then try and load the base type from type.__origin__ this bug appears on https://github.com/stephen-bunn/file-config/blob/master/src/file_config/utils.py#L370.

Your Environment

• File Config Version: 0.3.3
• Python Version: 3.7
• Operating System and Version: Ubuntu 18.04

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❤️ Thank you!

[stephen-bunn]

Fixed in 3a386a4