Error by OPCUA-Client command after installing all packages

[JacksonJoy]

Hi, I am trying to make raspberry pi 3 as client to visualize my data. At the final step after installing opcua and opcua-client i cannot run the opc-ua client.

It is showing invalid syntax. I am using Python 3.5.3. Is the syntax different. I am stuck. Could someone please help

pi@raspberrypi:~ $ opcua-client pyqtgraph or numpy are not installed, use of graph feature disabled Traceback (most recent call last): File "/usr/local/bin/opcua-client", line 7, in from uaclient.mainwindow import main File "/usr/local/lib/python3.5/dist-packages/uaclient/mainwindow.py", line 23, in from uawidgets.attrs_widget import AttrsWidget File "/home/pi/.local/lib/python3.5/site-packages/uawidgets/attrs_widget.py", line 11, in from uawidgets.get_node_dialog import GetNodeButton File "/home/pi/.local/lib/python3.5/site-packages/uawidgets/get_node_dialog.py", line 7, in from uawidgets.tree_widget import TreeWidget File "/home/pi/.local/lib/python3.5/site-packages/uawidgets/tree_widget.py", line 62 raise ValueError(f"Node {node} not found in tree") ^ SyntaxError: invalid syntax

[zerox1212]

Do you have all dependencies such s PyQT 5?

[oroulet]

This is a python 3.6 that went in.... F-string is 3.6

[JacksonJoy]

Do you have all dependencies such s PyQT 5?

Thank you zerox1212. Yes I have installed PyQT5. It went succesfully.

[JacksonJoy]

This is a python 3.6 that went in.... F-string is 3.6

Thank you oroulet. But my version is Python 3.5.3. Should I update my python in raspberry pi to 3.6?

[zerox1212]

Yes, you need python 3.6 or higher.

[cbergmiller]

From the stack trace it looks like the f-string is in uawidgets In the master branch there is no f-string in tree_widgets.py: https://github.com/FreeOpcUa/opcua-widgets/blob/master/uawidgets/tree_widget.py How can that be?

[oroulet]

He uses the released version and I probably fixed master

[JacksonJoy]

Hi. I edited the tree_widget.py, so that it can run on python 3.5. Then it functioned. Thank you everyone for the help

[Knight9206]

@JacksonJoy hi, i also have some problem about in raspberry pi 3+. how did you edit your tree_widget.py. I try to upgrade python 3.6 and i can not resolve that problem. can you give me some comment?

[vivaladav]

Replacing all the occurrences of (f" with (" in _uawidgets/treewidget.py allows to run it fine with Python 3.5.

For example
raise ValueError(f"Node {node} not found in tree") should become raise ValueError("Node {node} not found in tree")

@Knight9206

[shraddha291996]

Hello, While installing OPCUA connector kafka I am getting this error I have attached. I tried searching on google but could not find anything to solve the error. Could anyone please help :) Thanks in advance.

[rupesharora]

I encountered with same issue. Resolved by running following commands. sudo apt install pyqt5-dev-tools pyqt5-dev

If still doesn't work try below too: sudo apt-get install python3-pyqt5