User:Pedro Sá Couto/Prototyping 5th/Flask App/Starting Flask App: Difference between revisions

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<pre style="color: silver; background: black;">
<pre style="color: silver; background: black;">
$ sudo touch app.py
$ sudo touch app.py
</pre>
===04 Open app.py===
<pre style="color: silver; background: black;">
$ vim app.py
</pre>
===05 Simple Hello world app===
<source lang="python">
from flask import Flask
app = Flask(__name__)
@app.route("/")
def index():
    return "Hello world!"
if __name__ == "__main__":
    app.run()
</source>
===06 Export app===
<pre style="color: silver; background: black;">
$ export FLASK_APP=app.py
</pre>
===07 Change Flask environment===
<pre>
Difference between development and production
You do not want to run the development environment on a server that is running, because it gives debugging information, it is not safe
</pre>
<pre style="color: silver; background: black;">
$ export FLASK_ENV=development
$ FLASK_ENV=development
</pre>
===08 Run the app outside localhost, otherwise you would only see it in the Pi===
<pre style="color: silver; background: black;">
$ flask run --host=0.0.0.0
</pre>
</pre>

Revision as of 22:12, 31 March 2020

Starting Flask App

01 Activate the created Virtual Environment

$ source venv/bin/activate

02 Check installed packages

$ pip list

03 Create your app

$ sudo touch app.py

04 Open app.py

$ vim app.py

05 Simple Hello world app

from flask import Flask

app = Flask(__name__)

@app.route("/")
def index():
    return "Hello world!"

if __name__ == "__main__":
    app.run()

06 Export app

$ export FLASK_APP=app.py

07 Change Flask environment

Difference between development and production
You do not want to run the development environment on a server that is running, because it gives debugging information, it is not safe

$ export FLASK_ENV=development
$ FLASK_ENV=development

08 Run the app outside localhost, otherwise you would only see it in the Pi

$ flask run --host=0.0.0.0
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