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* bpo-33018: Improve issubclass() error checking and message. (GH-5944)Miss Islington (bot)2018-03-221-0/+2
| | | | | | | This improves error message for situations when a non-class is checked w.r.t. an abstract base class. (cherry picked from commit 40472dd42de4f7265d456458cd13ad6894d736db) Co-authored-by: jab <jab@users.noreply.github.com>
* bpo-31333: Re-implement ABCMeta in C (GH-5733)Ivan Levkivskyi2018-02-181-0/+145
This adds C versions of methods used by ABCMeta that improve performance of various ABC operations.