Re: pvaPy: PvObject - odict_keys not subscriptable issue

[Kuldeep Joshi via Tech-talk <tech-talk at aps.anl.gov>]

Hello,

Thank you the code with your suggested modification is working.

I am unable to execute ca_table_server.py located in the table folder (of Phoebus Examples)  with Python3. Can I use the pcaspy lib for python3

It works fine with python2.7

location :https://github.com/ControlSystemStudio/phoebus/tree/master/app/display/model/src/main/resources/examples/table_server

I tried another Phoebus demo code server.py at this path "Display Builder/table" located at

https://github.com/ControlSystemStudio/phoebus/tree/master/app/display/model/src/main/resources/examples/table

Here I have incorporated the dict() call as per your suggestion. Table is visible only for the first table widget.

For the remaining widgets I am seeing structure for the pva. I guess the structure is not proper.

pl find the snap attached.

Regards,

Kuldeep

On Tue, Oct 5, 2021 at 2:08 PM Veseli, Sinisa <sveseli at anl.gov> wrote:

Hi,

For python3 it looks like phoebus example needs to be modified a bit. Could you please try these changes?

bluegill2> git diff app/display/model/src/main/resources/examples/table_server/server.py

diff --git a/app/display/model/src/main/resources/examples/table_server/server.py b/app/display/model/src/main/resources/exam

index 54135d7..1e1a579 100644

--- a/app/display/model/src/main/resources/examples/table_server/server.py

+++ b/app/display/model/src/main/resources/examples/table_server/server.py

@@ -54,7 +54,7 @@ def updateValue(pv):

 

 # create PVs

 tableStructDict = {'labels' : [STRING],

-                    'value' : OrderedDict([('id', [UINT]), ('name', [STRING]), ('title', [STRING])])}

+                    'value' : dict(OrderedDict([('id', [UINT]), ('name', [STRING]), ('title', [STRING])]))}

 tablePV = PvObject(tableStructDict, "epics:nt/NTTable:1.0")

 tablePV['labels'] = ['ID', 'Name', 'Title']

 namePV = PvString('')

@@ -63,5 +63,8 @@ namePV = PvString('')

 server = PvaServer('table', tablePV)

 server.addRecord('name', namePV, updateValue)

 

-raw_input("\nEnter anything to quit\n")

+try:

+    raw_input("\nEnter anything to quit\n")

+except NameError as ex:

+    input("\nEnter anything to quit\n")

The above should work on both python2 and python3.

Please let me know if you have any issues.

Thanks,

Sinisa

--

Siniša Veseli

Scientific Software Engineering & Data Management

Advanced Photon Source

Argonne National Laboratory

sveseli at anl.gov

(630)252-9182

---

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Kuldeep Joshi via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, October 5, 2021 1:54 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: pvaPy: PvObject - odict_keys not subscriptable issue

 

Hello,

I was trying to execute a python script that is available with the phoebus example.

I am getting an "odict_keys object is not subscriptable" error.

I understand this is so for all python3.x versions. The code is getting executed on Python2.x versions

However I see that pvaPy supports python3.x. What am I doing wrong.

Regards,

Kuldeep

The console output:

phoebus/example/Display Builder/table_server$ python server.py
server.py:34: SyntaxWarning: "is" with a literal. Did you mean "=="?
  if name is '':
Traceback (most recent call last):
  File "server.py", line 58, in <module>
    tablePV = PvObject(tableStructDict, "epics:nt/NTTable:1.0")
TypeError: 'odict_keys' object is not subscriptable

Attachment: Screenshot from 2021-10-06 10-57-12.png
Description: PNG image