title: Find all occurrences of a character in a String
body: <p>I'm really new to python and trying to build a Hangman Game for practice.<br><br>
  I'm using Python 3.6.1
  <br><br>
  The User can enter a letter and I want to tell him if there is any occurrence of that letter in the word and where it is.<br><br>
  I get the total number of occurrences by using <code>occurrences = currentWord.count(guess)</code>
  <br><br>
  I have <code>firstLetterIndex = (currentWord.find(guess))</code>, to get the index.<br><br>
  Now I have the index of the first Letter, but what if the word has this letter multiple times?<br>
  I tried <code>secondLetterIndex = (currentWord.find(guess[firstLetterIndex, currentWordlength]))</code>, but that doesn't work.<br>
  Is there a better way to do this? Maybe a build in function i can't find?</p>