Building a Python Web application in jenkins
Options 1) without using docker

Choose Free Style project when create jenkins job
Configure the Source code management section to tell jenkins where to fetch the source code, 
Write the build commands you used by manual in build section.  
If your jenkins slave not installed Python and jenkins server not support to install Python on jenkins slave, you need to write commands in 'build' section to install Python,pip needed for build on jenkins slave.

Option 2) using docker

Build a docker image with all requried soft and tool installed and configured to supply a build enviroment  
(You can search there is exist docker image can meet your requirement on docker image hub before build image yourself? )
Upload the image to docker image hub
Install docker engine on jenkins slave
Create Free style project
Congiure Source Code Management section
Write docker command in  Build section to pull docker image and start a docker container, execute build command inside container
I want to build an existing Python web application in jenkins, just like building a java application using Maven.
Is it possible or not? if possible, please help me with necessary configurations to build and Continuous Deployment of the same application.