title: How to create new dictionary from string?
body: <p>I have a string: <code>my_str = &quot;abra cadabra&quot;</code>
  I need to create a new dictionary , the keys in the dictionary are the letters in my_str and the value should be the amount of every letter.
  For example:</p>
  <pre><code>my_str = &quot;abra cadabra&quot;
  output &gt;&gt;
  {'a': 5, 'b': 2, 'r': 2, 'c': 1, 'd': 1}
  </code></pre>
  <p>What i got is - <code>{'a': 5, 'b': 5, 'r': 5, 'c': 5, 'd': 5}</code></p>