DATABASE_URL is not set(CS50) [duplicate]

Question

I'm working on cs50 project1 (js & python), I download the project, and found this line in it:

engine = create_engine(os.getenv("DATABASE_URL"))

the question is how to set up the DATABASE_URL?

Answer 1

add this code after initialising your app:

app.config['DATABASE_URL'] = "path_to_db"

Or export it by running in your command line:

export DATABASE_URL=""postgres://user:password@server_ip:5432/table_name""

Answer 2

If you use Linux you could set variable in environment via:

 $ export DATABASE_URL="postgresql://localhost/yourdatabase"