New submission from Thomas Arildsen: When I run the attached example in Python 2.7.9, it succeeds. In Python 3.4, it fails as shown below. I use json 2.0.9 and numpy 1.9.2 with both versions of Python. Python and all packages provided by Anaconda 2.2.0. The error seems to be caused by the serialised object containing a numpy.int64 type. It might fail with other 64-bit numpy types as well (untested).
--------------------------------------------------------------------------- TypeError Traceback (most recent call last) /home/tha/tmp/debug_json/debug_json.py in <module>() 4 test = {'value': np.int64(1)} 5 ----> 6 obj=json.dumps(test) /home/tha/.conda/envs/python3/lib/python3.4/json/__init__.py in dumps(obj, skipkeys, ensure_ascii, check_circular, allow_nan, cls, indent, separators, default, sort_keys, **kw) 228 cls is None and indent is None and separators is None and 229 default is None and not sort_keys and not kw): --> 230 return _default_encoder.encode(obj) 231 if cls is None: 232 cls = JSONEncoder /home/tha/.conda/envs/python3/lib/python3.4/json/encoder.py in encode(self, o) 190 # exceptions aren't as detailed. The list call should be roughly 191 # equivalent to the PySequence_Fast that ''.join() would do. --> 192 chunks = self.iterencode(o, _one_shot=True) 193 if not isinstance(chunks, (list, tuple)): 194 chunks = list(chunks) /home/tha/.conda/envs/python3/lib/python3.4/json/encoder.py in iterencode(self, o, _one_shot) 248 self.key_separator, self.item_separator, self.sort_keys, 249 self.skipkeys, _one_shot) --> 250 return _iterencode(o, 0) 251 252 def _make_iterencode(markers, _default, _encoder, _indent, _floatstr, /home/tha/.conda/envs/python3/lib/python3.4/json/encoder.py in default(self, o) 171 172 """ --> 173 raise TypeError(repr(o) + " is not JSON serializable") 174 175 def encode(self, o): TypeError: 1 is not JSON serializable ---------- files: debug_json.py messages: 244288 nosy: thomas-arildsen priority: normal severity: normal status: open title: json fails to serialise numpy.int64 type: crash versions: Python 3.4 Added file: http://bugs.python.org/file39530/debug_json.py _______________________________________ 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