Celery is a widely used queue processor that is used with python applications to managae the complicated but routine task of queue processing. We typically use queues for long running process that can be run on the background like emails and image manipulation that would otherwise take a long time and might block user I/O.
Python tools like Scrapy and Beautiful Soup with LXML makes it very easy to crawl public data over the internet. Crawling is the process of automating the task of acquiring publicly available data through an automated program. Python with these tools are most widely used in the industry when it comes to crawling needs as they are very efficient and retrieving content from both structured and unstructured data formats.
Multiple web MVC frameworks written on top of python like Django and Flash makes it easy to go from zero to a fully developed web portal in a fraction of time of conventional development.
Micro applications are small utility applications written as add-ons for bigger projects. Python specializes in tools like Web.Py that makes it easy to write Micro Applications efficiently with a small footprint.
With the expansion and improvements to client side technologies, REST APIs are growing in demand to support them. Django Rest Framework and other similar tools makes it a breeze to get up and running with a REST API.
The language structure and the semantics of Python makes it an incredible tool to write console applications and utilities. These can be anything ranging from a batch job or cron job that needs to perform a routine set of instructions.