从列表中随机选择N个项目，可能重复

Question

I am trying to generate a list of random items from another list b. Duplicates are allowed. I cannot use random.sample because N can exceed the number of items in list b.
I have written some code below:

def generate_random_sequence(n):
   population = []
   for i in xrange(n):
       b = random.choice(stuff)
       population.append(b) 

However i am really concerned about it's performance as it will be performed a lot of times. Is there a method in Random library that performs this task? Or is there a more optimized way of doing this task?

Answer 1

You can use random.choice in numpy library:

In [3]: np.random.choice([1,5,6],10)
Out[3]: array([6, 5, 6, 6, 6, 6, 1, 6, 1, 6])