Hey guys,
I wondered if anyone had an issue with Raspberry Pi Stretch running MMA v11.2 in which calling 
 
StartExternalSession[<|"System"->"Python,"SessionProlog"->"import math"|>]
yields an error accusing invalid option "SessionProlog".
I've used this on MacOS and it works fine, but it is crashing on the Pi. 
I can't seem to upgrade it to v 11.3 to check is that is the issue.
Anyone encountered this issue?