Usage of string slicing

 st[start:end:step]  Start , end , step

#!/usr/bin/python
#-*- coding:utf-8 -*-
str = "abcdef"

## Print a character 
print str[0]

## Print label 0,1 The characters of , barring 2
print str[0:2]

## Print from page 0 Start , To the first 3 All strings ending in , Excluding the 3 individual 
print str[:3]

## Two characters apart , Print from page 0 Start , To the first 3 All strings ending in , Excluding the 3 individual , The last one is step size 

print str[:3:2]

## Reverse printing 
print str[::-1]