Hi,

I need to update pandas - web2py uses the Ubuntu distribution version 
(which is getting old Pandas 0.17.0). So I pip installed the latest version 
into 'web2py/site-packages/' but then the page hangs for like 5min and then 
all I get is this error message in /var/log/apache2/error.log :
[Fri Apr 28 10:24:17.228021 2017] [core:error] [pid 8261] [client 
81.133...] End of script output before headers: wsgihandler.py, referer: 
https://.../user/login?_next=/... 

And I get a 'Internal Server Error' in the browser.

Any idea, what could be wrong, or help debugging this further?

Setup: Apache/2.4.7 (Ubuntu) PHP/5.5.9-1ubuntu4.21 OpenSSL/1.0.1f 
mod_wsgi/3.4 Python/2.7.6

BTW I tried switching to nginx, but that opened up an other can of worm... 
and I ended up giving up after getting a Segmentation Fault from uwsgi... 
 in hindsight I should have checked if it was that same issue with pandas, 
but I curled up in a ball and cried instead...

PS updating pandas also updates: six, numpy and dateutil 

Thanks,
Nicolas

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