├── templates ├── README.md ├── about.html ├── home.html └── template.html ├── .DS_Store ├── static ├── README.md ├── css │ └── template.css └── js │ ├── windowScript.js │ └── jquery-3.4.1.min.js ├── hello.py ├── routes.py ├── routes_port80.py └── README.md /templates/README.md: -------------------------------------------------------------------------------- 1 | This folder contains all HTML/template files. 2 | -------------------------------------------------------------------------------- /.DS_Store: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/InsightDataScience/flask-sample-app/master/.DS_Store -------------------------------------------------------------------------------- /static/README.md: -------------------------------------------------------------------------------- 1 | This folder contains all static resources used by HTML pages(from folder `templates`). 2 | -------------------------------------------------------------------------------- /hello.py: -------------------------------------------------------------------------------- 1 | from flask import Flask 2 | app = Flask(__name__) 3 | 4 | @app.route('/') 5 | def hello_world(): 6 | return 'Hello, World!' 7 | -------------------------------------------------------------------------------- /static/css/template.css: -------------------------------------------------------------------------------- 1 | /* unvisited link */ 2 | #additional_text { 3 | color: red; 4 | } 5 | 6 | a:link { 7 | color: red; 8 | } 9 | 10 | /* visited link */ 11 | a:visited { 12 | color: green; 13 | } 14 | 15 | /* mouse over link */ 16 | a:hover { 17 | color: hotpink; 18 | } 19 | 20 | /* selected link */ 21 | a:active { 22 | color: blue; 23 | } 24 | -------------------------------------------------------------------------------- /static/js/windowScript.js: -------------------------------------------------------------------------------- 1 | $(document).ready(function() { 2 | $('#btn-hide-text').click(function() { $('#additional_text').hide() } ); 3 | $('#btn-show-text').click(function() { $('#additional_text').show() } ); 4 | $('#btn-show-route').click(function() { 5 | var userName = $('#user_name').val(), 6 | uri = "/user/" + userName; 7 | $.get(uri, function(data, status) { 8 | console.log('Printing on browser: ' + JSON.stringify(data)); 9 | }); 10 | }); 11 | }); 12 | -------------------------------------------------------------------------------- /templates/about.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | About Flask 6 | 7 | 8 | {% extends "template.html" %} 9 | {% block content %} 10 | 11 |

About Flask

12 |

Flask is a micro web framework written in Python.

13 |

Applications that use the Flask framework include Pinterest, 14 | LinkedIn, and the community web page for Flask itself.

15 | 16 | {% endblock %} 17 | 18 | 19 | -------------------------------------------------------------------------------- /templates/home.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Flask Tutorial 6 | 7 | 8 | {% extends "template.html" %} 9 | {% block content %} 10 | 11 |

Use Javascript/Bootstrap buttons

12 |

Flask is Fun.

13 | 14 | 15 | 16 |
17 |

Route examples

18 | 19 | 20 | {% endblock %} 21 | 22 | 23 | -------------------------------------------------------------------------------- /routes.py: -------------------------------------------------------------------------------- 1 | from flask import Flask, escape, render_template 2 | app = Flask(__name__) 3 | 4 | # Root path that returns home.html 5 | @app.route('/') 6 | def home(): 7 | return render_template("home.html") 8 | 9 | # About page 10 | @app.route('/about') 11 | def about(): 12 | return render_template("about.html") 13 | 14 | # Route that accepts a username(string) and returns it. You can use something similar 15 | # to fetch details of a username 16 | @app.route('/user/') 17 | def show_user_profile(username): 18 | # show the user profile for that user 19 | return 'User %s' % escape(username) 20 | 21 | @app.route('/userwithslash//') 22 | def show_user_profile_withslash(username): 23 | # show the user profile for that user 24 | return 'User %s' % escape(username) 25 | 26 | @app.route('/post/') 27 | def show_post(post_id): 28 | # show the post with the given id, the id is an integer 29 | return 'Post %d' % post_id 30 | 31 | @app.route('/path/') 32 | def show_subpath(subpath): 33 | # show the subpath after /path/ 34 | return 'Subpath %s' % escape(subpath) 35 | -------------------------------------------------------------------------------- /routes_port80.py: -------------------------------------------------------------------------------- 1 | from flask import Flask, escape, render_template 2 | app = Flask(__name__) 3 | 4 | # Root path that returns home.html 5 | @app.route('/') 6 | def home(): 7 | return render_template("home.html") 8 | 9 | # About page 10 | @app.route('/about') 11 | def about(): 12 | return render_template("about.html") 13 | 14 | # Route that accepts a username(string) and returns it. You can use something similar 15 | # to fetch details of a username 16 | @app.route('/user/') 17 | def show_user_profile(username): 18 | # show the user profile for that user 19 | return 'User %s' % escape(username) 20 | 21 | @app.route('/userwithslash//') 22 | def show_user_profile_withslash(username): 23 | # show the user profile for that user 24 | return 'User With Slash %s' % escape(username) 25 | 26 | @app.route('/post/') 27 | def show_post(post_id): 28 | # show the post with the given id, the id is an integer 29 | return 'Post %d' % post_id 30 | 31 | @app.route('/path/') 32 | def show_subpath(subpath): 33 | # show the subpath after /path/ 34 | return 'Subpath %s' % escape(subpath) 35 | 36 | if __name__ == "__main__": 37 | app.run(port="80", host="0.0.0.0") 38 | -------------------------------------------------------------------------------- /templates/template.html: -------------------------------------------------------------------------------- 1 | 2 | 3 | 4 | 5 | Flask Parent Template 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 |
20 |
21 |

First Web App

22 | 28 |
29 |
30 | 31 | {% block content %} 32 | {% endblock %} 33 | 34 | 35 | 36 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Flask: Getting Started 2 | This repo is to help you in setting up a simple Flask app. Use this to understand the elements of a Flask app. This document contains of the following sections: 3 | 1. [Installation](#installation) 4 | 2. [Quickstart](#quickstart-hello-world) 5 | 3. [Simple FLASK_APP](#a-simple-flask_app) 6 | 4. [Simple FLASK_APP on port 80](#a-simple-flask_app-port-80) 7 | 5. [Intro to Web: Client-Server](#intro-to-web-client-server-model) 8 | 9 | ### Installation 10 | It's recommended to do this on a new EC2 instance. So do spin up a new one if you don't have one yet. 11 | 12 | The installation steps are mentioned below. All these are based on this [page](https://flask.palletsprojects.com/en/1.1.x/installation/#create-an-environment). 13 | 14 | * Clone this Github repo 15 | * `git clone https://github.com/InsightDataScience/flask-sample-app` 16 | 17 | * Access repo folder. Create Python Virtual Environment 18 | * `cd flask-sample-app` 19 | * `python3 -m venv venv` 20 | * If you are seeing an error, you may have to run `python3 -m venv venv --without-pip` 21 | 22 | * Activate Environment 23 | * `. venv/bin/activate` 24 | 25 | * Install flask 26 | * `pip install Flask` 27 | 28 | ### Quickstart: Hello World 29 | In the dir `flask-sample-app`, there is a file `hello.py`. We'll use this to setup a hello-world Flask app. 30 | * `export FLASK_APP=hello.py` 31 | * `flask run --host=0.0.0.0` 32 | * On a browser, type in `http://(your-EC2-public-IP):5000` in the location bar. You should see “Hello, World!” on your browser. 33 | * You may have to enable your EC2 Security-Group to have an inbound rule with `port:5000` and `source:anywhere` 34 | 35 | 36 | ### A simple FLASK_APP 37 | 38 | Now that you have a hello-world Flask app working, we can build a slightly more involved app. This app involves a few components a webapp usually would have. We'll use the file `routes.py`, instead of `hello.py`. 39 | 40 | * Stop the Flask hello-world app by issuing `ctrl-c` 41 | * `export FLASK_APP=routes.py` 42 | * `flask run --host=0.0.0.0` 43 | 44 | Reload your web browser with the same link you used before. You should see a page with a couple of links and buttons on it. This should demonstrate on how to use CSS and JS files that's associated with a webapp. 45 | 46 | ### A simple FLASK_APP (port 80) 47 | Now we will run Flask app on port 80 - the default HTTP port for any webpage request. 48 | 49 | **WARNING: This method should NOT be used in any other production environment. This is only a quick way to have your Flask app running on port 80 for Insight Project** 50 | 51 | * Switch to user `su` 52 | * `sudo su - ` 53 | 54 | * Go to previous folder 55 | * `cd flask-sample-app` 56 | 57 | * `python3 -m venv venv` 58 | * If you are seeing an error, you may have to run `python3 -m venv venv --without-pip` 59 | 60 | * Activate Environment 61 | * `. venv/bin/activate` 62 | 63 | * Install flask. Previous install was done for user `ubuntu`. Now we'll have to do same for user `su`. 64 | * `pip install Flask` 65 | 66 | * `export FLASK_APP=routes_port80.py` 67 | 68 | * Run Flask app in background. This should 69 | * `nohup flask run --host=0.0.0.0 --port=80 &` 70 | * ensure to copy `&` from the above command. This takes Flask app to the background. [Read more](https://www.lifewire.com/multitasking-background-foreground-process-2180219) 71 | * check the file `nohup.out` for any errors. 72 | 73 | ### Intro to Web: client-server model 74 | 75 | Once you have this app working, take time to understand how a webapp works. Here's a good [intro](https://developer.mozilla.org/en-US/docs/Learn/Getting_started_with_the_web/How_the_Web_works) on how web works. Essentially there are 2 parts: 76 | * **client-code**: Everything that's related to a webpage that appears in a web browser. In this case, client-code includes everything in folders `static`, and `templates`. 77 | * `templates` has only HTML source code. 78 | * `static` has all JavaScript and CSS code that's used by pages by `templates`. 79 | * **server-code**: Flask server that "serves" webpages. In this case, files `hello.py`, `routes.py`, and `routes_port80.py` represents server-code. 80 | 81 | `client-code` makes requests that are **served** by routes in `server-code`. Hence the name web-server. 82 | 83 | To see how client-server model works, we'll use the webpage to understand it better. Type some text in the textarea you see in the home-page. Click button 'Use Route'. You should see text printed on browser's [console](https://developers.google.com/web/tools/chrome-devtools/console). 84 | 85 | The following happened when you clicked button 'Use Route': 86 | * `(client)` In JavaScript file `windowScript`, user-input is stored in variable `userName`. This value is sent to server. 87 | * `(server)` In file `routes_port80`, user-input is received in variable `username` (line 17). 88 | * you should the user-input in flask-server file `nohup.out`. In short, what you typed in the webpage has appeared in Flask server! 89 | * `(server)` The same `username` is returned with "User" prefixed. 90 | * this operation is done by route `/user/`. 91 | * `(client)` Back in JavaScript file `windowScript`, the new string is received in variable `data`. This is printed on the console. 92 | 93 | The above steps demonstrates a very simple example of how data is sent between client and server. 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