title: Trouble understanding Set comprehensions
body: <p>I don't quite understand why their is a C in the beginning of the {}. Is this just syntax for comprehensive sets?</p>
  
  <p>x= {c for c in "I've got plenty of nothing"}
  print(sorted(x))</p>
  
  <p>This prints: [' ', "'", I, 'e', 'f', 'g', 'h', 'i', 'l', 'n', 'o', 'p', 't,' 'v', 'y']
   Can someone explain why I need a c before the for loop? </p>