How can I return False if a character in a string appears three times in a row

I have asked this question before, and although the response from the kind StackOverflow users were right, it kinda fails to answer my question, or it’s kinda complicated for a beginner like me, so I’m gonna ask again :).

So here is a code which checks whether a string fits certain criterias or not….

def passwordlength(password: str):
    upper = digit = special = False
    for char in password:
        if char in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" :
            upper = True
        elif char in "1234567890":
            digit = True
        elif char in "$#@%!":
            special = True
    return upper and digit and special

def password(password: str):
    if passwordlength(password):
        if not (6 < len(password) < 12):
            return False
    else:     
        return True

So this part works fine. no problem with my initial code. However, I’m trying to edit my code so that if a number, character or letter appears 3 times in a row.. for example, AAA or ccc or 111 or ###, the output would be false

Here is my attempt at it, which didn’t work at all…

def passwordlength(password: str):
    upper = digit = special = False
    for char in password:
        if char in "ABCDEFGHIJKLMNOPQRSTUVWXYZ" :
            upper = True
        elif char in "1234567890":
            digit = True
        elif char in "$#@%!":
            special = True
    return upper and digit and special

def password(password: str):
    if passwordlength(password):
        if not (6 < len(password) < 12):
            return False
        for char in password:
            if password.count(char) > 3:
                return False
        return True
    return False

What should I change in my code to make sure this works??

Please use the simplest form of coding possible since I’m a beginner and I would like to learn along as I do programming :). Also pls dont use import or collections.iter because I haven’t learnt that yet… I’m learning python online and I haven’t learnt that far yet.. Thank you 🙂

>Solution :

A trivial implementation would be:

def check_repeating_chars(password):
    for i in range(2, len(password)):
        if password[i] == password[i-1] == password[i-2]:
            return False
    return True