@app.route("<STR_LIT>")<EOL>def logout():
session.pop("<STR_LIT:user>", None)<EOL>return redirect(url_for("<STR_LIT:index>"))<EOL>
Log out the user from the application.

    Log out the user from the application by removing them from the
    session.  Note: this does not log the user out of Facebook - this is done
    by the JavaScript SDK.