title: Python type hints in for loop
body: <p>What's the proper type hints in PEP8 to type hint variable defined within the for loop or in nested for loop.</p>
  <pre><code>a: int
  for a in iterable_A:
      for b in iterable_B:
          pass
  </code></pre>
  <p>what would be the proper PEP8 standard type hints use for <strong>b</strong>?<br />
  I've tried both seem to be working.</p>
  <pre><code>a: int
  for a in iterable_A:
      b: int
      for b in iterable_B:
          pass
  </code></pre>
  <p>OR
  in nested for loop.</p>
  <pre><code>a: int
  b: int
  for a in iterable_A:
      for b in iterable_B:
          pass
  </code></pre>