Make Flask Fast and Reliable – Simple Steps

Flask is a microframework for Python, which is mostly used in web-backend development.There are projects in FOSSASIA that are using flask for development purposes such as Open Event Server, Query Server, Badgeyay. Optimization is indeed one of the most important steps for a successful software product. So, in this post some few off- the-hook tricks will be shown which will make your flask-app more fast and reliable.


  1. Flask-Compress is a python package which basically provides de-facto lossless compression  to your Flask application.
  2. Enough with the theory, now let’s understand the coding part:
    1. First install the module

2. Then for a basic setup

3.That’s it! All it takes is just few lines of code to make your flask app optimized .To know more about the module check out flask-compress module.

Requirements Directory

  1. A common practice amongst different FOSSASIA  projects which involves dividing requirements.txt files for development,testing as well as production.
  2. Basically when projects either use TRAVIS CI for testing or are deployed to Cloud Services like Heroku, there are some modules which are not really required at some places.  For example: gunicorn is only required for deployment purposes and not for development.
  3. So how about we have a separate directory wherein different .txt files are created for different purposes.
  4. Below is the image of file directory structure followed for requirements in badgeyay project.

  1. As you can see different .txt files are created for different purposes
    1. dev.txt – for development
    2. prod.txt – for production(i.e. deployment)
    3. test.txt – for testing.


Using Inkscape to create SVG Files for Background of Event Badges in Badgeyay

Inkscape is a free and open-source vector graphics editor. I used it in the FOSSASIA Badgeyay repository whose main purpose is to create badges for the event created using open-event. Badges were created in Scalable Vector Graphics (SVG) because of its advantages over JPEG, png etc. such as: scalability, Search Engine Optimization (SEO) friendly, easy editing ability (as it gets saved in an XML format) and resolution independence.

My task (issue #20) was to create the background in SVG format so that it can be edited using XML file. Aim was to create the background in such a way so that we just have to find and replace the color code to see the color change in the image/background. Following background was to be reproduced in SVG format using Inkscape whose color can be edited using a text editor.


This was achieved using Inkscape (as suggested in the issue itself) which let us create an SVG file. I created 2 layers, 1 for plain background, and the other containing the triangles of Voronoi Diagram. General steps are included in this awesome video tutorial – AbstractBackground.

I found this quite helpful in understanding the interface of Inkscape. After following this tutorial, I had to do changes as follows:

  • Layer 1 rectangle was made using mesh, giving 4 different colors at corners. I set these colors as grey with different opacity/alpha factor.
  • Then just like in the video, I created a small circular object, set it to ‘path to object’, made duplicates of them, scattered them on the rectangle of 1st layer.
  • Used extensions menu to use ‘voronoi diagram‘, and then applied this to the selected circles.
  • Then I removed these circles, ungrouped all the triangles formed , changed their color, just by picking with the background (which was grey — with different opacities!). Grouped them together again, removed the lines which were separating the triangles by setting stroke to none.
  • Now all one have to do is change the color of 1st layer’ rectangle, and the final image/background will get changed .

This change of color can be changed using a text editor too. I just had to find layer 1 rectangle in the XML tree, replace the ‘fill’ attribute with the required color code.

This was achieved using INKSCAPE.

badge background

Now using text editor (here Sublime Text 3) , find layer 1, and change ‘fill’ value of rect with say ‘37C871’.

      inkscape:label="Layer 1"
        style="opacity:1;fill:#37C871;fill-opacity:1;stroke:url(#linearGradient2561);stroke-width:0.57644272" />

changed badge background color
Then again opening the svg file, gives us the output as :

Results can be seen in my Pull request #152 which eventually got merged.

Using the similar background and adding logo of FOSSASIA on the top, also adding editable Headings like ‘VIP’, ‘BUSINESS PASS’  was done further in #PR167.

If you want to contribute to FOSSASIA/badgeyay, you can create an issue here.