Essentially, functools.partial is almost good enough for specifying some of the parameters of an object's initializer, but the partial object doesn't respond properly to issubclass. Please consider adding something like partialclass described here:
https://stackoverflow.com/questions/38911146/python-equivalent-of-functools-partial-for-a-class-constructor I ended up doing the same thing here: https://stackoverflow.com/questions/50143864/is-there-a-nice-way-to-partially-bind-class-parameters-in-python/50143893#50143893 Adding functools.partialclass would be similar to the addition of partialmethod in 3.4. Best, Neil
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