title: Sequence of letters in Python
body: <p>Is there a built-in method / module in Python to generate letters such as the built-in constant LETTERS or letters constant in R?</p>
  
  <p>The R built-in constant works as <code>letters[n]</code> where if <code>n = 1:26</code> the lower-case letters of the alphabet are produced.</p>
  
  <p>Thanks.</p>