Re: a simple question about pyepics

["Mooney, Tim M." <mooney@aps.anl.gov>]

What happens when you type these commands at the python prompt?

>>> import epics

>>> epics.ca.find_libca()

Tim Mooney (mooney@aps.anl.gov) (630)252-5417
Beamline Controls Group (www.aps.anl.gov)
Advanced Photon Source, Argonne National Lab

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From: tech-talk-bounces@aps.anl.gov <tech-talk-bounces@aps.anl.gov> on behalf of 梁雅翔 <liangyx@ihep.ac.cn>
Sent: Saturday, August 18, 2018 11:14:12 PM
To: tech-talk
Subject: a simple question about pyepics

 

Hi all,

      My environment:  CentOS 7（64），epics 3.15.5, python 2.7.5, pyepics from pip.

      I could not connect the pv when I using pyepics ( I set the EPICS_BASE,EPICS_HOST_ARCH, PYEPICS_LIBCA ).

    First I started the example IOC, and it worked fine.

    Then I try to connect it using pyepics.

Then I got these:

***************

>>> import epics
>>> from epics import caget, caput
>>> m1 = caget('lyx:ai3')
print m1
cannot connect to lyx:ai3
>>> print m1

      I think maybe the question was installation. Since I didn't understand these sentences well in document of pyepics.

************ sentence in document **************************    

Getting Started, Setting up the Epics Environment

Put the dynamic library somewhere in the Python path. A convenient place might be the same site-packages/pyepics library folder as the python package is installed.

To find out which CA library will be used by pyepics, use:

>>> import epics >>> epics.ca.find_libca() 

************************************

      I knew where the libcaI is. But I didn't know where I should put it in python path. So I did not put the libca.so in python path.

     And others was fine. For python I knew such a little thing.

     Could someone give me some help. Why I could not connect it.

Thanks.

Liang yx