Enviro+ issue: python and python 3

Support
1

Hi

I am a relatively novice user and am currently trying to set up my Enviro+.

I have had problems with installing bme280. Following the “Getting started article” on Pimoroni for the enviro+ seemed to install everything but I encountered an error when running the all-in-one.py script
from bme280 import BME280
Traceback (most recent call last):
File “”, line 1, in
ImportError: cannot import name BME280

I have researched the error and uninstalled enviroplus from the pi. Then reinstalled it using the curl install mentioned on this forum. I also installed the libraries to Python3.

What I have come to realise is that the line of code “from bme280 import BME280” runs fine from the Python3 shell, but not from the Python shell. I cannot run the enviroplus python code from a Python3 shell as it is not formatted correctly.

Could anyone provide further guidance on getting the bme280 libraries running. The module is definitely installed on the Pi.

Thank you

2

Do you want to use Python2 or Python3?

I use Python3 for everything as Python2 went end of life in January. To install things for Python3 I use pip3 instead of pip.

I use the bme280 library from Python3 without problems. When you say the examples aren’t formatted correctly for Python3 can you be more specific. It should be an easy fix.

3

Thanks for the reply. Yep I agree Python 3 makes sense.

I am referring to the example python scripts that pimoroni supply for the enviro+ board. There are several very useful scripts that enable readings from the sensors to display on the LED screen.

I guess I may need to reformat them into python 3 scripts as they are currently python 2. Unless I can get the bme280 library working

4

IIRC I had to change a lot of divides from / to // to make the examples work in Python3. I think 2 always produces an integer when two integers are divided by 3 produces a fraction so // has to be used to force an integer result like 2.

5

Still wondering why the bme280 line of code
From bme20 import BME280

Won’t run in python 2. As this is what is suggested in the enviro+ tutorial.

6

If you type

pip2 list | grep bme

do you get something like

pimoroni-bme280 0.0.1

7

Yep, I get
bme 280 0.5
pimoroni-bme280 0.0.2

8

Looks like you have two bme280 libraries installed. Perhaps the non-pimoroni one doesn’t have the BME280 constructor. You could try

pip2 uninstall bme280

Also I noticed that the pimoroni github for the Enviro+ was updated for Python3 today.