Python Basic learning Article Python sequence

A sequence is a collection of functions that have indexes and slices. Tuples, lists, and strings have the ability to access a specific value through an index, or to return a slice through a slice, so that tuples, lists, and strings belong to the sequence.

Example: Index function of a sequence

#!/usr/bin/env python#-*-coding=utf-8-*-#Using GPL v3.3#Author: [email protected]#Index OperationsTuple = ("Apple","Banana","Grape","Orange") List= ["Apple","Banana","Grape","Orange"]str="Apple"PrintTuple[0]PrintTuple[-1]PrintList[0]PrintList[-1]PrintStr[0]PrintSTR[-1]

Output Result:

----------python2.7-----------Normal termination

Example: The Shard function of a sequence

#!/usr/bin/env python#-*-coding=utf-8-*-#Using GPL v3.3#Author: [email protected]#Shard OperationsTuple = ("Apple","Banana","Grape","Orange") List= ["Apple","Banana","Grape","Orange"]str="Apple"PrintTuple[:3]PrintTuple[3:]PrintTuple[1:-1]Printtuple[:]PrintList[:3]PrintList[3:]PrintList[1:-1]Printlist[:]PrintStr[:3]PrintStr[3:]PrintStr[1:-1]Printstr[:]

Output Result:

----------python2.7----------('Apple','Banana','Grape')('Orange',) ('Banana','Grape')('Apple','Banana','Grape','Orange')['Apple','Banana','Grape']['Orange']['Banana','Grape']['Apple','Banana','Grape','Orange']applepplapple output completed (0 seconds elapsed)-Normal termination

Attention:

Shard Seq[:3] Represents the value of the entire sequence from the 1th element of the sequence to the 3rd element, The Shard [:].

Tuples and lists have the attributes of a sequence, but they are also more distinct.

1, tuples are only a set of data that can be read, and tuples do not provide a way to sort and find.

2, the list of data can be read, can also write, and provides a wealth of operation methods, support sorting, find operations.

3. The difference between a tuple and a list

	Support for negative indexing	Support Sharding	Support for adding, deleting, modifying	Support sorting, finding	The composition of the data
Meta-group	Is	Is	Whether	Whether	A set of different meanings of data
List	Is	Is	Is	Is	A set of data of the same meaning

Python Basic learning Article Python sequence