To run in development mode, set the FLASKENV=development environment variable then use the flask run command (remember to point FLASKAPP to your app as well). For Linux, Mac, Linux Subsystem for Windows, Git Bash on Windows, etc.: export FLASKAPP=myapp export FLASKENV=development flask run For Windows CMD, use set instead of export. In this post we looked at how to run a Flask-based microservice on Kubernetes. At this point, you should have a basic understanding of how Kubernetes works and be able to deploy a cluster with an app running on it. Additional Resources: Learn Kubernetes Basics; Configuration Best Practices; Scaling Flask with Kubernetes. # this is an official Python runtime, used as the parent image FROM python:3.6.5-slim # set the working directory in the container to /app WORKDIR /app # add the current directory to the container as /app ADD. /app # execute everyone's favorite pip command, pip install -r RUN pip install -trusted-host pypi.python.org -r requirements.txt # unblock port 80 for the Flask app to run on EXPOSE 80.
Great job! Your website is now ready to deploy to an online server.
However, deploying a flask application that has been built with your main Python installation can be a bad idea sometimes. Furthermore, it is not advisable to even start creating a web app using your main Python installation. Because you use Python for many other things, there can be a lot going in that installation.
Therefore, it would be good to have a clean environment that does not interfere with your main Python installation. The hero here is the venv library. venv is a Python standard library that creates a virtual environment with an isolated Python installation. That installation will serve only to our flask web application, and not any other purposes. That will allow us to deploy a clean application to the online server. venv comes shipped with Python so you don’t need to install it.
Creating a virtual environment is the first thing you should do before writing any code. In this tutorial I didn’t want to confuse you with that and I decided to keep things plain and simple so that you could focus on the application instead. Now, you’re mature enough to use a virtual environment for your web applications. So, next time you build a flask application, you should create a virtual environment before you write any file. And below you will learn how to create one.
You can then create a virtual environment. The virtual environment files will be generated inside a folder that is at the same directory level with the folder where your app files are. It’s a good idea to create another folder (e.g. myblog) and put the app folder inside it. Then, open a terminal/command line while you are in the myblog folder and type this:
python –m venv virtual
So, we’re using Python and the
venv
standard library to create a folder named virtual with all the necessary virtual environment files. Your directory tree should look like this now.If you explore the Scripts folder you will find a python.exe file. That means you have a Python installation in your virtual environment. And there is also a pip.exe which means you have the pip library with you as well and you can use it to install other libraries for your isolated Python.
And of course, we need to install our flask library if we want to run our website using the Python installation of our virtual environment. How to delete adobe apps from mac. For that you need to use your isolated pip. So, while you are inside the main myblog folder, you can type this in the command line:
virtualScriptspip install flask
That should install flask under virtualLibsite-packages
Great!
Let’s now run our website using our virtual environment. For that, while you are in the myblog folder, you need to point to the isolated Python and then to the
hello.py
script:virtualScriptspython apphello.py
That will show the same website on
localhost:5000
as it did before:Now we are ready to throw this beautiful website to the online cloud.
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In this tutorial you’ll learn how to build a web app with Python. We’ll use a micro-framework called Flask.
Why Flask?
Run Flask App Mac Download
- easy to use.
- built in development server and debugger
- integrated unit testing support
- RESTful request dispatching
- uses Jinja2 templating
- support for secure cookies (client side sessions)
- 100% WSGI 1.0 compliant
- Unicode based
- extensively documented
Related course:
Python Flask: Make Web Apps with Python
Python Flask: Make Web Apps with Python
Create a file called hello.py
Finally run the web app using this command:
Open http://localhost:5000/ in your webbrowser, and “Hello World!” should appear.
Creating URL routes
Flask App Api
URL Routing makes URLs in your Web app easy to remember. We will now create some URL routes:
Copy the code below and save it as app.py
Restart the application using:
Try the URLs in your browser:
Related course:
Python Flask: Make Web Apps with Python
Python Flask: Make Web Apps with Python
Style Flask Pages
We will separate code and User Interface using a technique called Templates. We make the directory called /templates/ and create the template:
The Python Flask app with have a new URL route. We have changed the default port to 80, the default HTTP port:
You can then open : http://127.0.0.1/hello/Jackson/
Styling the template
Do you want some better looking template? We modify the file:
Do you want some better looking template? We modify the file:
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We then create layout.html which defines the look of the page. (You may want to split the stylesheet and layout.html file). Copy this as layout.html
Restart the App and open the url. http://127.0.0.1/hello/Jackson/
You can pick any name other than Jackson. Google drive app on mac.
You can pick any name other than Jackson. Google drive app on mac.
Flask App Example
python webapp flaskFlask App Route
Related course:
Python Flask: Make Web Apps with Python Mac os finder apps.
Python Flask: Make Web Apps with Python Mac os finder apps.
Passing Variables
Lets display random quotes instead of always the same quote. We will need to pass both the name variable and the quote variable. To pass multiple variables to the function, we simply do this:
Our new test.html template will look like this:
We will need to pick a random quote. To do so, we use this code:
The first thing you see is we have defined an array of multiples quotes. These can be accessed as quote[0], quote[1], quote[2] and so on. The function randint() returns a random number between 0 and the total number of quotes, one is subtracted because we start counting from zero. Finally we set the quote variable to the quote the computer has chosen. Copy the code below to app.py:
When you restart the application it will return one of these quotes at random.
python flask webapRun Flask App Mac Os
Whats next?
You could link your site with a database system such as MySQL, MariaDb or SQLite. You can find an SQLite tutorial here. Enjoy creating your application!
You could link your site with a database system such as MySQL, MariaDb or SQLite. You can find an SQLite tutorial here. Enjoy creating your application!