Wrong python version used with smbus2?

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Guido Cioni

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Jul 11, 2022, 1:21:49 PM7/11/22

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I'm trying to add the BME280 sensor with the https://gitlab.com/wjcarpenter/bme280wx plugin. I installed all required dependencies and verified that the data are correctly read using a python script containing

import smbus2

which I invoke as python test.py.

I have only 1 version of python installed in this system, that is this python linked to python3

pi@weather:~ $ python
Python 3.9.2 (default, Feb 28 2021, 17:03:44)
[GCC 10.2.1 20210110] on linux

It has smbus2 installed

pi@weather:~ $ pip list

Package Version
------------- ---------

....
smbus2 0.4.2

....

this is apparently the same Python version used by weewx

Jul 11 19:11:27 weather weewx[2704] INFO __main__: Using Python 3.9.2 (default, Feb 28 2021, 17:03:44) #012[GCC 10.2.1 20210110]

However this fails to import smbus2

Jul 11 19:11:27 weather weewx[2707] DEBUG weewx.engine: Loading service user.bme280wx.Bme280wx
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: Caught unrecoverable exception:
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** No module named 'smbus2'
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** Traceback (most recent call last):
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** File "/usr/share/weewx/weewxd", line 147, in main
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** engine = weewx.engine.StdEngine(config_dict)
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** File "/usr/share/weewx/weewx/engine.py", line 93, in __init__
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** self.loadServices(config_dict)
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** File "/usr/share/weewx/weewx/engine.py", line 161, in loadServices
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** obj = weeutil.weeutil.get_object(svc)(self, config_dict)
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** File "/usr/share/weewx/weeutil/weeutil.py", line 1150, in get_object
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** mod = __import__(module)
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** File "/usr/share/weewx/user/bme280wx.py", line 5, in <module>
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** import smbus2
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** ModuleNotFoundError: No module named 'smbus2'
Jul 11 19:11:27 weather weewx[2707] CRITICAL __main__: **** Exiting.

I'm really puzzled...which version of Python is weewx using?

Guido Cioni

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Jul 11, 2022, 2:02:37 PM7/11/22

to weewx-user

Ok I figured out that those libraries need to be installed in the python3 of sudo, because weewx is starting as sudo...