title: tkinter - add data from nested list with dictionary to treeview
body: <p>I am trying to put some data in my treeview and I'm new to the treeview and do'sent understand it fully, if tried to read the documentation, but got even more confused. </p>
  
  <p>I created a nested list with 2 sublists and last some dictionaries. </p>
  
  <pre><code>isolering = [
  [
  {"name": "mineraluld"},
  {"dim": "0,195"},
  {"lambda": "0,37"},
  {"z": "250"},
  {"fire": "NA"}
  ],
  [
  {"name": "mineraluld2"},
  {"dim": "0,195"},
  {"lambda": "0,37"},
  {"z": "250"},
  {"fire": "NA"}
  ]]
  
  materialLibrary = [isolering]
  </code></pre>
  
  <p>Now i can't figure out the proper way to put my data in the treeview. </p>
  
  <p>This is how far I got. 
  I can't figure out, the way to call my data. I trying to it, like you would call it by it's index. But I understand it's wrong. </p>
  
  <pre><code>tree.insert("" , 0, text="Name")
  tree.insert("", 1, "dirIso", text="Isolering")
  tree.insert("dirIso", 1, text=materialLibrary[0][1][0]["name"],values=(materialLibrary[0][1][0]["dim"],
                                                                       materialLibrary[0][1][0]["lambda"],
                                                                       materialLibrary[0][1][0]["z"],
                                                                       materialLibrary[0][1][0]["fire"]))
  </code></pre>
  
  <p>I have here a picture of hat I'm trying to accomplish.</p>
  
  <p><a href="https://i.stack.imgur.com/BGTsz.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/BGTsz.png" alt="enter image description here"></a> </p>
  
  <p>The error message I receive is this: KeyError: 'dim'</p>
  
  <p>Any help is appreciated or point in the right direction. </p>
  
  <p>Thx</p>