I am a python developer and use flask extensively and after having come across it few months back, I can say that there's nothing Flask can't do. I have started making a blogging platform similar to yours though it is not complete and lack commenting feature and voting feature, here's the code: https://github.com/scottydelta/miniblog

PS: you need to create required db and have data to see it working in case you plan on forking. Fortunately I am using sqlalchemy so models.py has the db schema.