import random

def random_char(num_of_char):
    charset="".join(chr(x) for x in range(33,127))
    #return charset[random.randint(0,94)]
    password="".join(charset[random.randint(0,94)] for y in range(num_of_char))
    return password

num_of=1
while num_of!=0:
    num_of=input("Num of characters? ")
    print (random_char(int(num_of)))