Installation crash: cannot import name etree

[c.huyck]

Sorry if there's a faq sheet that I couldn't find that already answers this.

I'm trying to install the spinnaker software.  I'm following the directions on http://spinnakermanchester.github.io/spynnaker/6.0.0/PyNNOnSpinnakerInstall.html#Central

The pips work but I crash out running http://spinnakermanchester.github.io/spynnaker/6.0.0/PyNNOnSpinnakerInstall.html#Central

I run

sudo python -m spynnaker8.setup_pynn

which crashes. The error I get is

cannot import name etree

which seems to come from the line

from lxml import etree

I installed lxml (sudo pip install lxml) and ran the sudo python again (then again in a new shell, then again after rebooting) but still crash out.

Any thoughts (or pointers to faqs)?

-Chris

[Andrew Rowley]

Hi,

 

My guess would be that you already have an lxml version installed but that it is not new enough.  It is true that our requirement for lxml doesn’t include a version, which might be because we haven’t so far encountered one that doesn’t work!

 

You could try to install the latest (which is almost certainly what our testing system uses):

pip install “lxml == 4.6.3”

 

Hopefully this will fix it, but please ask again if not,

 

Andrew :)

 

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[Chris Huyck]

Great!  That seems to sort that problem. Thanks!

-Chris