How to generate a random 4 digit number not starting with 0 and having unique digits?

Question

This works almost fine but the number starts with 0 sometimes:

import random
numbers = random.sample(range(10), 4)
print(\'\'.join(map(str, numbers)))
         


        

Answer 1

Just loop until you have something you like:

import random

numbers = [0]
while numbers[0] == 0:
    numbers = random.sample(range(10), 4)

print(''.join(map(str, numbers)))