Error: No SMBus

[jaknz]

Hi,
I have an up-to-date RPi3 and have plugged my PiGlow into it. I ran the install script, which didn't throw any errors, but the example scripts all fail to run. Looks like maybe an incompatibility between Python 2/3?

$ ./cycle.py 
0
Traceback (most recent call last):
  File "/home/pi/Pimoroni/piglow/examples/cycle.py", line 14, in <module>
    piglow.show()
  File "/usr/lib/python3/dist-packages/piglow.py", line 126, in show
    setup()
  File "/usr/lib/python3/dist-packages/piglow.py", line 323, in setup
    import sn3218
  File "/usr/lib/python3/dist-packages/sn3218.py", line 108, in <module>
    i2c = SMBus(i2c_bus_id())
FileNotFoundError: [Errno 2] No such file or directory