is it bug?
after ios10 update(iphone6), pythonista seems to be terminated in case of importing matplotlib.
import matplotlib.pyplot as plt
plt.xlim( #<< the app was terminated at this point
This was a documented bug in the 2.7 interpreter in the app store version. It is fixed in the beta, not sure if it has made it to the app store yet.
If you search the forums, or pythonista git repo, there is a workaround that disables completion in the editor, which at least prevents the crash.