from flask import Flask

import pkgutil
import sys

app = Flask(__name__)

EXTENSIONS_DIR = "extensions"
modules = pkgutil.iter_modules(path=[EXTENSIONS_DIR])
for loader, mod_name, ispkg in modules:
    if mod_name not in sys.modules:
        # It imports fine
        loaded_mod = __import__(EXTENSIONS_DIR+"."+mod_name+"."+mod_name, fromlist=[mod_name])
        # It does not register
        app.register_blueprint(loaded_mod)

/root
    /extensions
        /extension1
            __init__.py
            extension1.py
        /extension2
            __init__.py
            extension2.py
    simple_example.py

>python simple_example.py
Traceback (most recent call last):
  File "simple_example.py", line 14, in <module>
    app.register_blueprint(loaded_mod)
  File "C:Python27libsite-packagesflaskapp.py", line 62, in wrapper_func
    return f(self, *args, **kwargs)
  File "C:Python27libsite-packagesflaskapp.py", line 880, in register_blueprint
    if blueprint.name in self.blueprints:
AttributeError: 'module' object has no attribute 'name'

from flask import Blueprint

extension1 = Blueprint('extension1', __name__)

@extension1.route("/my_route")
def treasure_list():
    return "list of objects"