nrfutil ModuleNotFoundError: No module named 'constants'

[Bjorn191023]

Hi,

I have installed nrfutil on my Windows 10 computer and get the following error when running it:

C:\Users\00315055>nrfutil --help
Traceback (most recent call last):
File "c:\python37\lib\runpy.py", line 193, in _run_module_as_main
"__main__", mod_spec)
File "c:\python37\lib\runpy.py", line 85, in _run_code
exec(code, run_globals)
File "C:\Python37\Scripts\nrfutil.exe\__main__.py", line 5, in <module>
File "c:\python37\lib\site-packages\nordicsemi\__main__.py", line 53, in <module>
from nordicsemi.dfu.dfu_transport_serial import DfuTransportSerial
File "c:\python37\lib\site-packages\nordicsemi\dfu\dfu_transport_serial.py", line 52, in <module>
from nordicsemi.lister.device_lister import DeviceLister
File "c:\python37\lib\site-packages\nordicsemi\lister\device_lister.py", line 39, in <module>
from nordicsemi.lister.windows.lister_win32 import Win32Lister
File "c:\python37\lib\site-packages\nordicsemi\lister\windows\lister_win32.py", line 43, in <module>
from constants import DIGCF_PRESENT, DEVPKEY, DIGCF_DEVICEINTERFACE
ModuleNotFoundError: No module named 'constants'

I have the following Python version:

C:\Users\00315055>python --version
Python 3.7.4

BR / Björn

[AWagner]

Helllo Bjorn,

i have the exact same issue as you had. But in my case your solution does not work. I cant get nrfutil to function properly.

ImportError: cannot import name 'DIGCF_PRESENT' from 'constants' (c:\python37\lib\site-packages\constants.py)

This error does still appear.

Please help.

Python 3.9.0

[AWagner]

Fixed by downgrading to Python 3.8.6 and pip 20.1.1

[Bjorn191023]

Hi A Wagner,

Today I installed Python and nrfutil on a new computer. I installed Python 3.9.1 and then nrfutil through pip. I had the same issue as originally reported here, so it seems nrfutil does not work with Python 3.9.x. I downgraded Python to 3.7 and then nrfutil worked again.

Nordic should fix this issue, very irritating when you download something from scratch that crashes first thing :-(

BR / Björn

[Vidar Berg]

Hi,

Yes, it is unfortunate. The current nrfutil release was made before Python 3.9, hence not included in our release tests. I have already reported this to the team, so it should get fixed in the next version.

Best regards,

Vidar

[Bjorn191023]

Thanks Vidar, great that you have a fix in your plans :-)

Merry XMAS!

BR / Björn

[SmallerPond]

Hmm, I have a fresh install with 3.8.7 and I see the same error:

ImportError: cannot import name 'DIGCF_PRESENT' from 'constants' (c:\users\someone\appdata\local\programs\python\python38\lib\site-packages\constants.py)

This is a bummer since I need to test secure DFU for a client.

[Vidar Berg]

I am not sure if v3.8.7 has been tested. Is it an option to use the pre-buildt executables here: https://github.com/NordicSemiconductor/pc-nrfutil/releases ?

[jasonrogers]

Any update to this?  Still getting this error today.

[Marcel]

We have been installing several new machines recently and all of them are now using Python3.8 as 3.9 still does not work as per my comment devzone.nordicsemi.com/.../320752

This is valid for Windows 10 only though as all is working dandy on Mac over here.