title: Python: get first elements from tuple of strings
body: <p>I have the following query: is it possible to get tuple of first symbols for every string in tuple by slice?
  I've tried the following code:</p>
  
  <pre><code>t = ("aaa", "aab", "abc", "aba", "bcc")
  print(t[:][0])
  </code></pre>
  
  <p>and I got "aaa". What I want is ['a', 'a', 'a', 'a', 'b'].
  Sure it can be done by generator:</p>
  
  <pre><code>letters = (x[0] for x in t)
  </code></pre>
  
  <p>But is it possible to do by slices?
  Thank you.</p>