Dash-Covid

Application that utilizes Dash and several sources to vizualise coronavirus data.

Data sources and services

• NovelCOVID/API

  • Global Stats
  • Global Bar Chart
  • Country datatable

  All the NovelCOVID/API related code is at service/data_service.py

• WHO data files

  • Confirmed cases, deaths and recoveries timeline

  All the WHO data files related code is at service/who_service.py

The service/service.py simply acts as a dispatcher for the other two services.

Dash components

Three types of graphs are used from the dash components:

Bar Chart

Very simple chart that is provided a list of values and list of headers. Headers are used as x axis labels and values as y axis values. Updated constantly via NovelCOVID/API.

Line Chart

Multiline chart that is used as timeline. Data is updated daily from the file provided from WHO.

Data Table

Datatable that include full country data and also highlights new cases and deaths. Filtering and sorting are enabled as provided natively from Dash. Updated constantly via NovelCOVID/API.

Other files

• Procfile: File used to deploy in Heroku
• .gitignore: Boilerplate gitignore file for Python projects
• assets/theme.css: Dash provides some styling from codepen (can be found in app.py as external stylesheet). In order to have the application's theme modified a custom theme has been created. Majority of the styling is in here and is related to the Div and Graph dash components.

Using the app

Create a new folder for the project and initialize git and virual environment and activate the latter:

$ mkdir dash-covid
$ cd dash-covid
$ git clone https://github.com/karolosk/dash_example.git
$ cd dash_example       
$ virtualenv venv 
$ source venv/bin/activate 

Install the needed dependecies in your virual environment:

$ pip install -r requirements.txt

Finally run the application:

$ python app.py # or python3 app.py if you have both versions

Application will start at port 8050

Heroku deployment

Standard Heroku deployment, pulling from master on eah commit.

Application can be found here: Dash-Covid