[Numpy-discussion] Astype and strings

Travis Oliphant oliphant@enthought....
Tue Oct 27 14:59:04 CDT 2009


On Oct 26, 2009, at 9:54 AM, Eli Bressert wrote:

> Hi Everyone,
>
> Is Numpy supposed to behave this like this when converting an array of
> numbers to an array of strings with astype?

In general you have to tell NumPy how big the string should be (i.e.  
np.str is generic).

There are a few places where NumPy will look at the data you have in  
order to guess a size, but as you've seen astype is not one of those  
places.

I think astype could be fixed (by putting a special-case check in the  
current code for conversion to an unspecified-length string), but that  
has not been implemented.

Please file a feature enhancement issue on the Trac so we don't lose  
sight of this.

-Travis





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