If you decided to learn Python, please forget about web development for a while and concentrate in learning the language first.
Python is easy to pick up, but you must stand on your feet before you start to run.
Python is an easy, flexible and powerful general purpose programming language (which is specially suited for web development), but you should bear in mind that in order to become a web developer you must learn several different skills besides python.
The first basic skill you must learn is HTML.
HTML is the markup language of the web. All web pages are created with HTML, which defines the different elements contained in a web page.
Then you should learn CSS, which is another little language that defines the way each HTML element looks within a page (its color, the font type, its position on the page, etc).
It is a fundamental part of HTML5 (the newest incarnation of the HTML , which powers all the new applications being written for the web and mobile phones and tablets (iphone, ipad, blackberry, etc…).
Where does Python fit in?
That means that you will have to write code that will be run in a remote server rather than in the browser.
On the other hand, you can use any imaginable language on the server side.
People use php, java, ru, python, c#, etc…
Python will let you talk to the database or datastore, perform queries, retrieve information and format the output to your web page.
Yes, and many web sites work this way. But you would be limiting yourself (and your website usability).
Think about it:
But code written on the server side may give you more security and scalability, so both sides should be mastered to become a competent web developer.
As for web development frameworks:
Again, please first stand on your feet… When you reach the moment where you find yourself needing a framework, you will probably find out that you can get with a simpler solution rather than Django.
Django lets you create the whole structure of your website on the server side.
My advice: Forget about all these things, get a good python tutorial and learn it (and enjoy it!) before looking at all the other technologies you will need.