title: one-liner to check if at least one item in list exists in another list?
body: <p>Lets say I have a list
  <code>a=[1,2,3]</code>
  And I want to know if at least one of the numbers in it exist in another list, like this one:
  <code>b=[4,5,6,7,8,1]</code>
  In other words, I want to know if 1,2 or 3 exist(s) in list <code>b</code>.
  I now I could do something like</p>
  
  <pre><code>def func(a, b):
      for i in a:
         if i in b:
            return True
      return False
  </code></pre>
  
  <p>But is there possibly a way to put that in one line to make things tidy?</p>