title: Python3 filter/remove strings of a list
body: <p>i grabed some data and stuff with my crawler and now i have to analyse them.</p>
  <p>I got a list with different links of some pictures, but i just want to save the ones without <code>&quot;/Thumbnails&quot;</code></p>
  <p><code>pictures = ['Media/Shop/922180cruv.jpg', 'Media/Shop/922180cruvdet.jpg', 'Media/Shop/Thumbnails/922180cruvx320x240.jpg', 'Media/Shop/Thumbnails/922180cruvdetx320x240.jpg']</code></p>
  <p>Is there a way to say &quot;if string got /Thumbnails&quot;, remove all from the list?.
  I got a csv with ~25000 list in separate columns.</p>
  <p>Already tried with remove() and indexing, but my lists are different, so the index for the first list wont fit to the second list for example</p>