how to get data from other website after login on other sites through my site?

Hi,
    Actually I want to get data from other website, for example-- i have my django wesite, and one user login on my site then he click on link of other site(like coursera), which is given on my site, and login on coursera, then i want to get user's data from coursera site,not secure data, only course performance data....
please help me... i m unable to find out solution of this problem....

thanks in advance..
regards,
              Avnesh shakya

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