password generator using random module (no function)

import random

letters = "abcdefghijklmnopqrstuvwxyz"
uppercase_letters = letters.upper()
numbers = "0123456789"
symbols = "!@#$%^&*()_+-=:;?><,.{}[]"
all = letters + uppercase_letters + numbers + symbols

password_length = int(input("What's the length of the password? "))
password = ""

for i in range(password_length):
  password += random.choice(all)

print(password)