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Security: What Percentage of Passwords are Pure ASCII?

I was wondering what percentage of passwords are pure ASCII. Hence, I threw together some code:

#!/usr/bin/env python3

PASSWORD_LIST = "example.txt"

num_pure_ascii = 0
num_iso_8859_1_not_ascii = 0
num_passwords = 0
with open(PASSWORD_LIST, mode="rb") as f:
    for line in f:
        password = line.rstrip(b"\n")
        num_passwords += 1
        
        try:
            password.decode('ASCII')
            num_pure_ascii += 1
            print("Pure ASCII:", password, flush=True)
            
        except UnicodeDecodeError:
            try:
                password.decode('UTF-8').encode('ISO-8859-1')
                num_iso_8859_1_not_ascii += 1
                print("ISO-8859-1 (but not pure ASCII):", password, flush=True)

            except (UnicodeEncodeError, UnicodeDecodeError):
                print("Not encodable into ASCII or ISO-8859-1:", password, flush=True)

    percentage_pure_ascii = (100 * num_pure_ascii) / num_passwords        
    percentage_iso_8859_1_not_ascii = (100 * num_iso_8859_1_not_ascii) / num_passwords
    print("Num passwords:", num_passwords)
    print("Percentage that are pure ASCII:", percentage_pure_ascii)
    print("Percentage that are not pure ASCII but can be encoded into ISO-8859-1:", percentage_iso_8859_1_not_ascii)

Using the largest password list from Metasploit, /usr/share/wordlists/metasploit/password.lst:

  • Num passwords: 88397
  • Percentage that are pure ASCII: 99.65%
  • Percentage that are not pure ASCII but can be encoded into ISO-8859-1: 0.0%

Using the top 100,000 passwords according to https://github.com/danielmiessler/SecLists/blob/master/Passwords/Common-Credentials/10-million-password-list-top-1000000.txt:

  • Num passwords: 999998
  • Percentage that are pure ASCII: 99.9998%
  • Percentage that are not pure ASCII but can be encoded into ISO-8859-1: 0.0002%

CrackStation's Password Cracking Dictionary (human passwords only):

  • Num passwords: 63,941,069
  • Percentage that are pure ASCII: 99.93%
  • Percentage that are not pure ASCII but can be encoded into ISO-8859-1: 0.0259%

The results seem suspicious, so I wonder if I'm doing something wrong. I really expected more passwords would contain things like ñ and í, which my code would report as "not pure ASCII but can be encoded into ISO-8859-1".

Feel free to try it on your own password list and report the results below.

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