title: How to add a new line in Gtk textview?
body: <p>Here is my problem, I can't quite find the answer elsewhere. I want to show some text in a Gtk textview (python3), with a new line after each piece of text. When I use "\n", it shows "\n" rather than actually adding in a new line. Is there a way that I can fix this?</p>
  
  <p>This should be a reproducible version of my problem and then my output... (ps. I'm not an experienced programmer)</p>
  
  <pre><code>import gi
  gi.require_version("Gtk", "3.0")
  from gi.repository import Gtk
  
  records = ()
  tv = Gtk.TextView()
  
  records += ("a", "\n", "b", "\n", "c", "\n")
  tb = tv.get_buffer()
  tb.set_text(str(records))
  
  sw = Gtk.ScrolledWindow()
  sw.set_size_request(300,400)
  sw.add(tv)
  
  w = Gtk.Window()
  w.add(sw)
  w.show_all()
  
  Gtk.main()
  </code></pre>
  
  <p>current output in Gtk window:</p>
  
  <pre><code>('a','\n','b', '\n', 'c')
  </code></pre>
  
  <p>desired output in Gtk window:</p>
  
  <pre><code> 'a'
   'b'
   'c'
  </code></pre>