Random Password Generator 1: Simplified

import random
import string
import sys

possible_chars = string.ascii_letters + string.digits + string.punctuation

def nextchar(chars):
    return random.choice(chars)

yes_or_no = input("""
Would you like a random password suggestion generated?
Type Yes to continue: """).lower()

if yes_or_no == 'yes':
    try:
        pwd_len = int(input('How long do you want your password? '))
    except ValueError:
        sys.exit("You need to enter an integer. Please start the program over.")

    if 0 < pwd_len:
        new_pwd = ""
        for _ in range(pwd_len):
            new_pwd += nextchar(possible_chars)
        print("Your new password is:\n" + new_pwd)

    else:
        print("I can only generate passwords between 1 and 25 characters long.")

else:
    print("Well then, why did you run me?")