Hey @Fez, you can try something like this:
import random
x = ["9", "7", "5"]
y = ["1", "3", "5"]
z = ["6", "8", "2"]
file = open("new.txt",'w')
for a in range(0, 10):
file.write(x[random.randrange(0,3)] + " // " + y[random.randrange(0,3)] + " // " + z[random.randrange(0,3)] + "\n")
file.close()