[Python] I did some inline code for an assignment and I was wondering if using it would be...

The goal of the assignment was to initialize an empty list called rand_array then fill it with 10 unique random numbers

I figured out the assignment normally as per the teacher's directions:

import random

rand_array = []
while len(rand_array) != 10:
lmnt = random.randint(1, 15)
if lmnt not in rand_array:
rand_array.append(lmnt)

print(rand_array)


I modified it later to have inline to make it more efficient since my teacher didn't like me using inline:

import random

rand_array[]
while len(rand_array < 10:
lmnt = random.randint(1, 15)
rand_array.append(lmnt) if lmnt not in rand_array else None


I started questioning if this was actually more efficient and if I could still make it better if I take off the requirement of initializing an empty list. So, the main question is: "Is the second version more efficient than the first?" and also "Can I make the second version even more efficient?"

Also, before anyone says, "This is such a small assignment, it doesn't matter", if I use lots of inline code in the future, I need to know if the way I'm using it is more efficient than non-inline code.

Also I apologize in advance if anything I have typed is inaccurate.

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