class Password:
    def __init__(self, password="", message=""):
        self.__password = password
        self.__message = message


    def setPassword(self, password):
        self.__password = password

    def isValid(self):
        # check for at least 8 characters
        self.__atLeast8 = True if len(self.__password) >= 8 else False

        # check for at least 2 digits
        self.__digits = 0
        for i in self.__password:
            if i.isdigit():
                self.__digits += 1
        self.__sufficientDigits = True if self.__digits >= 2 else False

        # check for if phrase password is in self.__password
        self.__containsPassword = True
        if "password" in self.__password:
            self.____containsPassword = False

        # check if ends in 123
        self.__badEnding = True
        if "123" in self.__password[-3:]:
            self.__badEnding = False

        #check if self.__password is all numbers
        self.__allNum = True
        if not self.__password.isalnum():
            self.__allNum = False

        self.__letter = ""
        if not self.__password.isalnum():
            self.__letter += "password can only contain numbers and letters \n"
        if not self.__atLeast8:
            self.__letter += "password must have at least 8 characters (numbers and letters)\n"
        if not self.__sufficientDigits:
            self.__letter += "password must contain at least two digits\n"
        if not self.__containsPassword:
            self.__letter += "password cannot contain the word \"password\"\n"
        if not self.__badEnding:
            self.__letter += "password cannot end in 123"
        self.__message += self.__letter


    def getErrorMessage(self):

        if self.__message == "":
            return "Password is valid!"
        return self.__message