what is the difference between 1.x ,2.x and 3.x ?

Answer 1

I had to look at this question numerous times before I figured out you might mean Python versions. That's non-obvious (I've never even thought about version 1) and you'll probably get answers if you clarify.

Answer 2

A summary of changes starting at 1.x:
https://en.wikipedia.org/wiki/History_of_Python#Version_1.0_.281994.29

Specific changes, for 1.x versions:
https://www.python.org/download/releases/

From 2.x to 3.x all the release notes are on the downloads page:
https://www.python.org/downloads/

Answer 3

Just noticed the __future__ import:

"To document when incompatible changes were introduced, and when they will be — or were — made mandatory. This is a form of executable documentation, and can be inspected programmatically via importing__future__ and examining its contents."

Note, I'm using the python android documentation by "little drops".

Answer 4

yes i m talking abt versions of python

Answer 5

these are the differences between the Python tools..

for example : 2.x has Ascii (American standard code for info. interchange), meanwhile 3.x, all strings are unicode by default.