N = 10000000

def loops():
    nums = []
    for num in range(N):
        nums.append(num*2)
    #print nums
        
        
def list_comprehensions():
    nums = [num * 2 for num in range(N)]
    #print nums
    
    
def benchmark(func):
    import time
    start = time.time()
    func()
    end = time.time()
    name = func.__name__
    seconds = end - start
    print "FUNCTION: " + name + " TIME: " + str(seconds) + " s"
    
    
benchmark(loops)
benchmark(list_comprehensions)