title: Check if an array of substrings all exist in an array of strings
body: <p>I've got a bit of a complicated question (for my limited Python knowledge) around iterating through and checking an array for any missing values.</p>
  
  <p>I have an array of key strings and I need to check the array contains all substrings in another array. If it doesn't, I need to output which are missing.</p>
  
  <p>Example:</p>
  
  <pre><code>array1 = ['key/value/one123904', 'key/value/two342389', 'key/value/three234093']
  array2 = ['one', 'two', 'three', 'four']
  </code></pre>
  
  <p>My ideal output would be to say all elements of <code>array2</code> exist in <code>array1</code> if they do, or else in the example above, to output <code>No key for value: four</code></p>