Yes, https://forum.omz-software.com/topic/3375/installing-pygal/8

I am on Wifi swapping to 4G when it fails (in pasted log)

As I said in Slack, updating dulwich as per your recommendation, seems to have done the trick.

There was an error saying something about an error renaming to dulwich.old but restarting worked

Pythonista uses Python 2.7.5, which is a little older than the current 2.7.11 (and I think 2.7.12 is currently in release candidate status). So any standard library features added after 2.7.5 aren't available in Pythonista.

The release has been submitted, you might see it on the App Store soon @SimCityWok

One final query....
If I wanted to implement this, how would I change the class code?

def make(bits=256): assert bits in (256, 512) hashes = [] for hsh in range(int(bits//256)): myhash = TouchHash() hashes.append(myhash) return "".join(hashes)

How about shaking/moving your device while recording motion sensor data?