Antoine Pitrou added the comment: > It looks like json doesn't check for __index__, and I wonder if it should.
I don't know. Simply, under 2.7, int64 inherits from int: >>> np.int64.__mro__ (<type 'numpy.int64'>, <type 'numpy.signedinteger'>, <type 'numpy.integer'>, <type 'numpy.number'>, <type 'numpy.generic'>, <type 'int'>, <type 'object'>) while it doesn't under 3.x: >>> np.int64.__mro__ (<class 'numpy.int64'>, <class 'numpy.signedinteger'>, <class 'numpy.integer'>, <class 'numpy.number'>, <class 'numpy.generic'>, <class 'object'>) ---------- nosy: +pitrou type: crash -> enhancement versions: +Python 3.6 -Python 3.4 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue24313> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com