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Why are several JSON data types being serialized and others not?

Numpy has many different base types, all of which are listed here .

I tracked the problem in my program before float32that is not JSON-serializable, so I started testing all the data types from the list above:

>>> import numpy as np
>>> from json import dumps
>>> dumps(np.bool(True))
'true'
>>> dumps(np.bool_(True))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.4/json/__init__.py", line 230, in dumps
    return _default_encoder.encode(obj)
  File "/usr/lib/python3.4/json/encoder.py", line 192, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/lib/python3.4/json/encoder.py", line 250, in iterencode
    return _iterencode(o, 0)
  File "/usr/lib/python3.4/json/encoder.py", line 173, in default
    raise TypeError(repr(o) + " is not JSON serializable")
TypeError: True is not JSON serializable
>>> dumps(np.int(0))
'0'
>>> dumps(np.int_(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.intc(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.intp(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.int8(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.int16(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.int32(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.int64(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.uint8(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.uint16(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.uint32(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.uint64(0))
Traceback (most recent call last):
  [...]
TypeError: 0 is not JSON serializable
>>> dumps(np.float(0))
'0.0'
>>> dumps(np.float_(0))
'0.0'
>>> dumps(np.float16(0))
Traceback (most recent call last):
  [...]
TypeError: 0.0 is not JSON serializable
>>> dumps(np.float32(0))
Traceback (most recent call last):
  [...]
TypeError: 0.0 is not JSON serializable
>>> dumps(np.float64(0))
'0.0'
>>> dumps(np.complex(0))
Traceback (most recent call last):
  [...]
TypeError: 0j is not JSON serializable
>>> dumps(np.complex_(0))
Traceback (most recent call last):
  [...]
TypeError: 0j is not JSON serializable
>>> dumps(np.complex64(0))
Traceback (most recent call last):
  [...]
TypeError: 0j is not JSON serializable
>>> dumps(np.complex128(0))
Traceback (most recent call last):
  [...]
TypeError: 0j is not JSON serializable

So the type is complexnot serializable, which makes sense.

But it boolworks, but bool_not. intIt works, but there is nothing else with intin its name. float, float_And float64everything is in order, but float16and float32are not.

? , , , repr() . ? ?

+6
1

, JSON, Python:

>>> np.int is int
True
>>> np.float is float
True
>>> np.bool is bool
True

, NumPy, , JSON. , .

np.float _ - , np.float64 ( MacOS):

>>> np.float_ is np.float64
True

:

np.float64

64- . 'd'. Python .

:

np.float32

32- . 'f'. C .

, Python json.dumps(), C.

+4

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