title: Problems while reformating a list of tuples, by taking only the first value of the tuple?
body: <p>I have the following list of tuples:</p>
  
  <pre><code>&gt;&gt;&gt;lis = df['vals'].values.tolist()
  &gt;&gt;&gt;lis
  [[('apple', 'FRUIT'),
            ('$', 'SYM'),
            ('6.00', 'X'),
            ('bannana', 'FRUIT'),
            ('$', 'SYM'),
            ('4.00', 'X')]]
  </code></pre>
  
  <p>How can I reformat it into:</p>
  
  <pre><code>lis = [['apple: $ 6.00', 'bannana: $ 4.00']]
  </code></pre>
  
  <p>I tried to:</p>
  
  <pre><code>list_comp = [item for sublist in lis for item in sublist]
  list_comp = [' '.join(item) for t in list_comp for item in [t]]
  </code></pre>
  
  <p>However I do not get how to put the <code>:</code> and the above format.</p>