如何在给定时间段内获得具有给定标签的所有（即1500+）推文？

I am trying to get all the tweets that contain a hashtag (say #rstats) ocer the past two years (say Jan 11 to Dec 12). Using searchTwitter, however, only returns up to 1500. I think (based on some reading) that I have to login in order to be able to query more than 1500 tweets. Now, I am on a Mac OS, using R (I am open to using Python, if a simple straightforward solution exists there) and can't log in; running thisI am trying to get all the tweets that contain