Python Class for user validation

user_validation.py

""" User validation class"""

from abc import ABC, abstractmethod
import re


class UserValidation(ABC):
    def __init__(self, username, email, password):
        self.username = username
        self.email = email
        self.password = password

    @abstractmethod
    def check_username(self):
        regex = '^[a-zA-Z0-9]([._](?![._])|[a-zA-Z0-9]){6,18}[a-zA-Z0-9]$'
        if re.match(regex, self.username):
            return True

        raise ValueError('wrong username syntax')

    @abstractmethod
    def check_password(self):
        while True:
            if 8 > len(self.password):
                check = -1
                break
            elif not re.search("[a-z]", self.password):
                check = -1
                break
            elif not re.search("[A-Z]", self.password):
                check = -1
                break
            elif not re.search("[0-9]", self.password):
                check = -1
                break
            elif not re.search("[_@$!}[{(0*#%^&]", self.password):
                check = -1
                break
            elif re.search("\s", self.password):
                check = -1
                break
            else:
                check = 0
                return True

        if check == -1:
            raise ValueError('Password is not secure')

    @abstractmethod
    def check_email(self):
        match = re.search("(^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9]+\.[a-zA-Z0-9.]*\.*[com|org|edu]{3}$)", self.email)
        if match:
            return True
        raise ValueError('Email syntax is wrong')