title: How to use tuple as a key of a dictionary
body: <p>I have three lists : </p>
  
  <pre><code>gene = [gene_1, gene_2] 
  number = [1, 2] 
  list_third = ['atcatcg', 'atcatcg'] 
  </code></pre>
  
  <p>I want to create a dictionary and I want the key of this dictionary to be tuple containing the element of my first list and second list (gene and number) and the value will be the sequences</p>
  
  <p>I want my output to be like:</p>
  
  <pre><code>dict = {(gene_1, 1):'atcatcg', (gene_2, 2):'atcatcg'}
  </code></pre>