Python basic questions (related to csv file output)

There's a difficulty with the chords that I've never learned before. I felt like a wall to ask questions. I'm leaving a message because I have something to ask while I couldn't find a place to ask. I tried to create a random number and name in one line of the csv file and put 100 in it.

The file prints well If you put a variable in the wr.writerow, [1] and [kim] are created like this If you put more than one variable, [1,5,3] and [kim, park, park] will work like this.

Even if it's too basic, please. Please, look at Newbie with pity.

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import csv
import random


stList = [1,2,3,4,5,6,7,8,9]
naList = ['kim','lee','park']
f = open('mkname.csv','w')
wr = csv.writer(f)

num=100
for i in range(0,num):
    stL = random.sample(stList, 1)
    naL = random.sample(naList,1)
    wr.writerow([stL+stL+stL,naL+stL])




f.close()