random password generator

import random
import string

list = ""
br1 = int(20)
while br1>0:
    randnum = random.randint(0, 9)
    randstr = random.choice(string.ascii_letters)
    randsymbol = random.choice(string.punctuation)
    randnum3 = random.randint(1,3)
    if randnum3==1:
        list += str(randnum)
    elif randnum3==2:
        list += randstr
    else:
        list += randsymbol
    br1-=1
print(list)