dtype() examples that used to work
Travis Oliphant
oliphant.travis at ieee.org
Fri Oct 27 13:01:05 EDT 2006
Joris De Ridder wrote:
> Hi,
>
> The following did once work in NumPy:
>
>
>>>> dtype([int16])
>>>> dtype([[int16]])
>>>> dtype([uint,int32])
>>>> dtype(['f8','S10'])
>>>>
>
> but now they all generate a "TypeError: data type not understood". Why?
> I could not find the answer in help(dtype), the RecordArrays tutorial on
> scipy.org, the NumPy release notes, nor in the NumPy book.
>
It's in the release notes. Look in the section from 1.0b2 to 1.0b3.
It's highlighted with a Note:
*NOTE: * When creating data-type objects from lists, the list must be in
array descriptor format. The "list of data-type objects" approach is no
longer supported due to its ambiguity with the very common array
descriptor approach. You can still get this behavior using a
comma-separated string or changing your list to an array_descriptor:
[('', x) for x in oldlist]
-Travis
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