import python packages

Libraries
#1

Hallo,

I have been working with Robot Framework for a short time.
In Python, I installed two additional packages: pyvisa and pyserial.
These are located in the directory: C:\Program Files (x86)\Python39-32\Scripts.
This directory is assigned to the environment variable (system variable) “Path”.
Now I want to use (import) these two packages in Robot Framework.
I have created a Robotor: Basic Python Template.
At the beginning of the file task.py I import all the python-packages I need such as

import os
import sys
import serial
import pyvisa

…

When I run my Robot, the message "No module named serial" or "No module named pyvisa" appears.

My question is how to solve this problem?

Thanks a lot

#2

Run what kind of file? A .robot?
Or are you only using Python?

Do you have a small example on how you use the library you created?

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#3

Hello helio,

Thank you for your answer. In my example I am using a pure Python robot task.py (Basic Python Template) - not an A.robot.
In the test case I am trying to connect to an external device using a Modbus communication over a COM port.
In my planned test case several Python scripts have to be imported. But that’s not really the problem. Because it’s about importing installed Python packages.

I show a very simple, modified Python script in which I include the Python packages. You can already see from the Python code that
the Robot Framework does not recognize the two Python packages “serial” and “pyvisa” - see line 6 and 7.

Packages
Packages775×720 34.1 KB

After running the python robot, the following message appears in the terminal:

Packages2
Packages2828×596 27 KB

But with the command “pip freeze” I can show that the two packages are installed.

Thanks

#4

Sometimes, we have more than one Python installation and we are not running the expected one.

You can try to install those modules again, but be sure to use the exact Python:

python -m pip install -U --force serial pyvisa
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#5

Hello Helio,

thank you for your answer. I have a question. Could it be that the problem lies both with using the Python interpreter and with accessing the environment variables.
When I write a Python script and run it in VSCode (not in Robot framework),
the Python interpreter assigned to the “Path” system variable is used: C:\Program Files (x86)\Python39-32.
On the other hand, if I start a Python script in Robot-Framework, then Robot-Framework uses a Python interpreter from the directory: C:\ProgramData\robocorp\ht.

The same is with the environment variables. A normal Python script, which is not executed in the Robot Framework, accesses the directory
C:\Program Files (x86)\Python39-32\Scripts, which is also mapped to the “Path” environment variable.
The situation is different in the Robot Framework. Here folders are accessed which are located in the directory C:\ProgramData\robocorp\ht\ for example
C:\ProgramData\robocorp\ht\368d3ba_b1f3c24_d4ec2478\Scripts.

Here my question: Is it possible to change the Python interpreter as well as the access to the environment variables in Robot Framework?
I would like Robot Framework to use the interpreter from C:\Program Files (x86)\Python39-32\ and the environment variable Path with
C:\Program Files (x86)\Python39-32\Scripts.

Thanks

#6

Maybe someone can help you with VSCode configuration.
I only use RIDE or robot from command line.

You can create a .cmd file that sets the PATH and then call VSCode, or to run robot.

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