I'm new to programming, and tried to work through the flask tutorial.
<http://flask.pocoo.org/docs/tutorial/>

I'm stuck on this part (from the readme on github) when trying to run the app:
<https://github.com/mitsuhiko/flask/tree/master/examples/flaskr/>

Fire up a python shell and run this:

```
from flaskr import init_db; init_db()

```

I get this error when I try to run the command in python shell:

```
Import error: No module named flaskr

```

And I get this error when I try to run app locally:

```
sqlite3.OperationalError
OperationalError: unable to open database file

```

I've been looking for solution for several hours now, but to no avail.
Any thoughts on what I could check? Thank you.