[Numpy-discussion] datetime dtype possible regression

Charles R Harris charlesr.harris@gmail....
Sat Apr 28 10:18:19 CDT 2012


On Sat, Apr 28, 2012 at 9:13 AM, Wes McKinney <wesmckinn@gmail.com> wrote:

> On Fri, Apr 27, 2012 at 4:57 PM, Robert Kern <robert.kern@gmail.com>
> wrote:
> > On Fri, Apr 27, 2012 at 21:52, Travis Vaught <travis@vaught.net> wrote:
> >> With NumPy 1.6.1 (from EPD 7.2-2) I get this behavior:
> >>
> >>
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >>
> >> In [1]: import numpy as np
> >>
> >> In [2]: schema = np.dtype({'names':['symbol', 'date', 'open', 'high',
> 'low',
> >>    ...:                        'close', 'volume', 'adjclose'],
> >>    ...:                    'formats':['S8', 'M8', float, float, float,
> >> float,
> >>    ...:                        float, float]})
> >>
> >> In [3]: data = [("AAPL", "2012-04-12", 600.0, 605.0, 598.0, 602.0,
> 50000000,
> >> 602.0),]
> >>
> >> In [4]: recdata = np.array(data, dtype=schema)
> >>
> >> In [5]: recdata
> >> Out[5]:
> >> array([ ('AAPL', datetime.datetime(2012, 4, 12, 0, 0), 600.0, 605.0,
> 598.0,
> >> 602.0, 50000000.0, 602.0)],
> >>       dtype=[('symbol', '|S8'), ('date', ('<M8[us]', {})), ('open',
> '<f8'),
> >> ('high', '<f8'), ('low', '<f8'), ('close', '<f8'), ('volume', '<f8'),
> >> ('adjclose', '<f8')])
> >>
> >>
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >>
> >>
> >> With numpy-1.7.0.dev_3cb783e I get this:
> >>
> >>>>> import numpy as np
> >>
> >>>>> schema =
> >>>>>
> np.dtype({'names':['symbol','data','open','high','low','close','volume','adjclose'],
> >>>>> 'formats':['S8','M8',float,float,float,float,float,float]})
> >>
> >>>>> data =  [("AAPL", "2012-04-12", 600.0, 605.0, 598.0, 602.0, 50000000,
> >>>>> 602.0),]
> >>
> >>>>> recdata = np.array(data, dtype=schema)
> >> Traceback (most recent call last):
> >>   File "<stdin>", line 1, in <module>
> >> ValueError: Cannot create a NumPy datetime other than NaT with generic
> units
> >>
> >>>>> np.version.version
> >> '1.7.0.dev-3cb783e'
> >>
> >> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >>
> >> Any hints about a regression I can check for? Or perhaps I missed an api
> >> change for specifying datetime dtypes?
> >
> > Judging from the error message, it looks like an intentional API change.
> >
> > --
> > Robert Kern
> > _______________________________________________
> > NumPy-Discussion mailing list
> > NumPy-Discussion@scipy.org
> > http://mail.scipy.org/mailman/listinfo/numpy-discussion
>
> Maybe this should be raised as a bug (where do we report NumPy bugs
> these days, still Trac?). As I'm moving to datetime64 in pandas if
> NumPy 1.6.1 data has unpickling issues on NumPy 1.7+ it's going to be
> very problematic.
>

I was wondering what datetime you were using since the version in 1.6 had
issues. Have you tested with both?

Chuck
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