#------------------------------------------------------------------------------
#  RandomInts2.py
#------------------------------------------------------------------------------

import random
rng = random.Random() # create a random number generator

def randomList2(num, lower_bound, upper_bound):
   """
   Generate a list containing num random ints between lower_bound (inclusive)
   and upper_bound (exclusive). The result will contain no duplicates.
   """
   if num>(upper_bound-lower_bound):
      return None
   # end if
   
   result = []
   for i in range(num):
      while True:
         candidate = rng.randrange(lower_bound, upper_bound)
         if candidate not in result:
            break
         # end if
      # end while
      result.append(candidate)
   # end for
   return result
# end randomList2()


#-- main ----------------------------------------------------------------------


L = randomList2(5, 1, 13)
print(L)

# print some more random lists
print(randomList2(10,1,6))
print(randomList2(10,1,11))
print(randomList2(10,1,21))