whats the best way to find multiple appearance of string within a list in python?
<p>Lets say i have the following list:</p>

<blockquote>
  <p>['ab=2','bc=5','ab=1','cd=6','ab=7']</p>
</blockquote>

<p>whats the best (efficient) way to find all appearance of the word 'ab' in this list</p>
