Writing a password verification program, password format containing uppercase, lowercase letters, numbers, length 8

get_passwords DEF (): 
    password = INPUT ( 'Enter a password:' Strip ().) 
    list_lower = [] 
    list_upper = [] 
    list_digit = [] 
    IF len (password)> 0: 
        IF len (password) ==. 8: 
            K in password for: 
                IF k.isdigit (): 
                    list_digit.append (K) 
                elif k.islower (): 
                    list_lower.append (K) 
                elif k.isupper (): 
                    list_upper.append (K) 
                the else: 
                    Print ( 'no ! do anything ') 
            IF len (list_upper)> 0 and len (list_lower)> 0 and len (list_digit)> 0: 
                Print ('! entered password OK ') 
            the else:
                print ( 'password entered does not meet the requirements, the password must contain a combination of uppercase, lowercase, digits') 
        the else: 
            print ( 'length is not 8-bit input password, please reenter!') 
    elif len (password) == 0: 
        print ( 'password can not be empty!') 
    the else: 
        print ( 'such a situation does not exist!') 


get_passwords ()