__init__.py

from flask import Blueprint
from urls import url_rules


bp = Blueprint(__name__.split('.')[1], __name__, template_folder='templates')

for url_rule in url_rules:
    url_regex, view_func = url_rule
    bp.add_url_rule(url_regex, view_func=view_func, methods=['GET', 'POST'])

urls.py

from views import index
from views import register


url_rules = (
    ('/', index),
    ('/register/', register)
)