Django’s template system comes with a wide variety of built-in tags and filters designed to address the presentation logic needs of your application. You can extend the template engine by defining custom tags and filters using Python, and then make them available to your templates using the {% load %} tag.

Custom template tags and filters must be inside a Django app. If they relate to an existing app it makes sense to create them there; otherwise, you should create a new app to hold them.

Some times in the production level there may be a chance of adding new fields to our model.With the normal django models when we add new field to the model the database is not able to identify the new field.To make database identify the new field we have to drop the existing database from the database and sync our application again.During the time of production it is not possible to remove the existing data. The solution for this is Django-eav. With this we can add fields to our models on fly.

E-commerce is integration is becoming almost essential for every web application now a days. There are so many payment gateways to integrate with our application. Some of them are Amazon payments, Asiapay, BPAY, Brain Tree, PayPal ...etc. Out of these now in this we'll see how to integrate Paypal with our django Application.

Google App Engine (often referred to as GAE or simply App Engine) is a platform as a service (PaaS) cloud computing platform for developing and hosting web applications in Google-managed data centers. Applications are sandboxed and run across multiple servers.App Engine offers automatic scaling for web applications—as the number of requests increases for an application, App Engine automatically allocates more resources for the web application to handle the additional demand.

We do need to expose our local server to hit call-back URLs while programming with other APIs. There is a tool called local tunnel from http://localtunnel.me/ and that does it for you for free with https. Now, what local tunnel is? Local tunnel allows us to easily share a web service on our local development machine without any server modifications. It will assign a unique URL which can be publicly accessible that will proxy all requests to our locally running webserver.

There are many approches for generating PDF in python. pdfkit is one of the better approache as, it renders HTML into PDF with various image formats, html forms and other complex printable documents.

FFMPEG is a command-line tool that converts audio or video to required formats, which handle multimedia data. It can also capture and encode in real-time.

In general while sending emails, we will prepare some recipient addresses as our mailing list, which are valid and our recipients want and expect our mail. But some times, some emails which are invalid will bounce, and if valid recipients do not want your mail, they may mark your email as spam in their email client. High bounce and complaint rates put your account at risk of being shut down. So in order to avoid such problem we'll handle the bounces and complaints

Django is a python based web- application development framework. Setting up a sample app and running it as easy as pie. Nginx is a webserver and like every other webserver it has it Pro's and Con's. Nginx was an answer to concurrency issue(handling thousands of concurrent connections) faced in apache and raised to fame.

When You want to Provide access to Amazon Web Services Console or if you're planning to provide REST API Keys to your Developers of a Third Party Person, Using Providing access to Root Account Console or API Keys is not advisable since they basically will have full level access. Instead we can rely on IAM(Identity and Access Management).