- QUALITIES = ['xs', 's', 'm', 'l', 'xl']
- thumbnails.sort(key=lambda thumb: QUALITIES.index(thumb[1]))
- thumbnail = 'http://www.ndr.de' + thumbnails[-1][0]
+ quality_key = qualities(['xs', 's', 'm', 'l', 'xl'])
+ largest = max(thumbnails, key=lambda thumb: quality_key(thumb[1]))
+ thumbnail = 'http://www.ndr.de' + largest[0]