Problem with PyCharm inspection and :param types.

sample.py

# It requires `pip install Flask Flask-Restful`
from flask import Flask
from flask_restful import Api


def init_app():
    logger.debug('creating flask application')
    app = Flask(__name__)
    api = Api(app)

 # You should see problems marking app as an invalid parameter for Api in PyCharm 2017.2.3