This is a great solution!

You can simplify it further by changing

[!@#$%^&*()-+] to \W+ which is the regex for Any Non-alphanumeric character

So you would have...

count = 0
cases = [r'[a-z]', r'[A-Z]', r'[\d]', r'\W+']
for case in cases:
    if not re.search(case, password):
        count += 1

return max(count, 6 - n)