Hi,
I'll just comment on the creation of your dtype:
> dt = [("<f8", "<f8")]
You are creating a dtype with one field called '<f8' and with type '<f8':
>>> dt = [("<f8", "<f8")]
>>> dty = np.dtype(dt)
>>> dty.names
('<f8',)
What you may want are two fields with type '<f8' and without fieldname:
>>> dt = [("<f8", "<f8")]
>>> dty = np.dtype(('<f8,<f8'))
>>> dty.names
('f0', 'f1')
>>> dty.descr
[('f0', '<f8'), ('f1', '<f8')]
I can't help you with the json-module and what it's doing there. As the
output is unequal to the input, I suspect JSON to be misbehaving here.
If you need to store the dtype as strings, not as binary pickle, you can
use pickle.dumps and pickle.loads
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