Tutorial 1

Starting a basic flask application

Flask application can be run in following ways:

flask run command will look for app.py file in the current directory and use it to run the flask app
If you want to run flask but you don't want to name the file as app.py, you need to set and environment variable FLASK_APP to specify the file name to run flask app.
```
  export FLASK_APP=app_two.py
  flask run
```
You can set FLASK_APP variable per command basis instead of setting it in environment
```
  FLASK_APP=app_two.py flask run
```
In order to run the flask application using python you can user the command below
```
  python app_three.py
```