[NEST Users] Strange interaction between NEST and IPython

Dear Python experts among the NEST Users!

I just notice a strange interaction between NEST and Ipython. In a freshly started Ipython, I execute the following three statements

import nest n = nest.Create('parrot_neuron', positions=nest.spatial.free([(x, 0) for x in range(10000)])) n

The last one takes extraordinarily long, over 10 seconds, I think. But if I instead do

print(n)

it executes instantaneously.

Also, if I do the same thing in python directly, just entering

n

shows the NodeCollection immediately.

Can anyone reproduce this and does anyone have an idea what might be going on?

I am on macOS 14.3.1 with Python 3.12.2, Ipython 8.22.2, and have checked with NEST 3.6 and a branch of recent master.

Best, Hans Ekkehard

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Prof. Dr. Hans Ekkehard Plesser

Department of Data Science Faculty of Science and Technology Norwegian University of Life Sciences PO Box 5003, 1432 Aas, Norway

Phone +47 6723 1560 Email hans.ekkehard.plesser@nmbu.nomailto:hans.ekkehard.plesser@nmbu.no Home http://arken.nmbu.no/~plesser