Looks like this is a python2.7 module (relative module imports are handled a bit differently). Switch to the py2.7 interpreter (upper right corner of console for console work, or long press play if you are importing in a script)
Though, I can't help but wonder if panda is what you think it is... a depreciated api for the now-named telestream video encoding api?
Or did you mean to install pandas?
(if so, those playing the pythonista pandas request drinking game should now take a sip)
Unfortunately the forum search is really bad, but google works well: https://www.google.com/search?q=pythonista+install+pandas+site:forum.omz-software.com