cartopy on raspberrypi3

[AWSBarker]

hello thanks for your great work.
I'm trying to transfer a flight tracker onto raspberrypi 3 (stretch) but have failed to install cartopy. it seems its in the RPI repo for armv6l but not v7l.

what are my alternatives if any to install cartopy?

PS - seems berryconda worked fine on stretch despite most web pages saying it may/may not.

[AWSBarker]

By chance I found a work around using python3.5 and using sudo apt install python3-cartopy.
Then I was able to created a venv based on python3.5 with python3-cartopy (cryptography 2.3.1) and then recreate my requirements using the existing pip freeze > requirements.txt