Last part (mappingproxytype) is missing a line in the code. I suppose it should be something like:

Last part (mappingproxytype) is missing a line in the code. I suppose it should be something like:


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Last part (MappingProxyType) is missing a line in the code. I suppose it should be something like: ... classes["Math"] = 'B21' classes = MappingProxyType(classes) # Can


read ... Anyway, thanks for nice article.