Delete your numpy module in site packages, restart pythonista, make sure you don't have a file called numpy.py in the path that you are trying to import from.
Then, force quit pythonista, import numpy, wait (don't hit "X"), and if you still have an error, copy the entire traceback and paste it back here. Numpy as delivered with pythonista lives in Modules/standard library 3.6/site-packages, which is not writable (unless you are jailbbroken), so if it worked before, it will work again :)
If all else fails, copy stuff you want to keep from Documents to iCloud, then uninstall/reinstall pythonista, and copy back from iCloud. I think twice in many years, I have had some strange corruption in the write only areas that was only solved by a reinstall.