Explain indexing and slicing operation in sequences

• Different types of sequences in python are strings, Unicode strings, lists, tuples, buffers, and xrange objects. 
• Slicing & indexing operations are salient features of sequence. 
• indexing operation allows to access a particular item in the sequence directly ( similar to the array/list indexing) and the slicing operation allows to retrieve a part of the sequence. 
• The slicing operation is used by specifying the name of the sequence followed by an optional pair of numbers separated by a colon within square brackets say S[startno.:stopno]. 
• The startno in the slicing operation indicates the position from where the slice starts and the stopno indicates where the slice will stop at. 
• If the startno is ommited, Python will start at the beginning of the sequence. 
• If the stopno is ommited, Python will stop at the end of the sequence..

Following code will further explain indexing & slicing operation:

>>> cosmeticList =[‘lipsstick’,’facepowder’,eyeliner’,’blusher’,kajal’]

>>> print “Slicing operation :”,cosmeticList[2:]

Slicing operation :[‘eyeliner’,’blusher’,kajal’]

>>>print “Indexing operation :”,cosmeticList[0]

“Indexing operation :lipsstick