gistfile1.py

from flask import Flask, Blueprint, current_app, request
from collections import namedtuple


class ConfigBlueprint(Blueprint):
    def register(self, app, options, first_registration):
        self.options = options
        super(ConfigBlueprint, self).register(app, options, first_registration)


mod = ConfigBlueprint('damage', __name__, url_prefix='/damage')


@mod.route('/right')
def example():
    return current_app.blueprints[request.blueprint].options["whatever"]


@mod.route('/wrong')
def example2():
    return mod.options["whatever"]

app = Flask(__name__)

app.register_blueprint(mod, whatever='right value')

# now we'll reset the mod name to something that is not the blueprint
mod = namedtuple('BlueprintLiar', 'options')({'whatever': 'wrong value'})
assert mod.options['whatever'] != 'right value'

with app.test_client() as c:
    assert c.get('/damage/wrong').data == 'wrong value'
    assert c.get('/damage/right').data == 'right value'