NumPY: Reading/Writing Arrays To/From Files

John J. Lee phrxy at
Thu Mar 29 20:18:32 CEST 2001

On Wed, 28 Mar 2001, Grant Griffin wrote:

> Ben Held wrote:
> >
> > I would like to be able to read/write NumPY array objects to/from ascii
> > files.  I could not find support for this in the NumPY code.  Any ideas?
> >
> > Ben
> I forget exactly, but I think there's something out there called
> "arrayio".  Look for Travis Oliphant's page: I think you can find it
> there.

ArrayIO I think is for binary data, not ASCII.  As far as I can tell,
Travis' pages haven't resurfaced since they disappeared a few months ago.
There is a copy at

but this may be ancient for all I know.  You can do the same thing with
the Python standard library too, IIRC.

TableIO reads ASCII tables.

There is a bug somewhere around line 40 that you'll get if you use Numeric
arrays where it wants lists.  Just delete the line that checks for array
type, and put in a try / except if you feel like it.

This is faster than a python version of course, but the GNU C library
implementation of strtok() has trouble with input like .3 or 3. (one or
the other).


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