From man env:
PHP Code:
-i, --ignore-environment
start with an empty environment
Maybe busybox on Kobo starts env with -i implicitly?
Anyway, you can install Python on Kobo:
Python 3:
https://www.mobileread.com/forums/sho...20#post2885820
Python 2:
https://www.mobileread.com/forums/sho...03#post2583203