Sunday, December 29, 2024

Python -3

 Lists


It is used to store Collection of data.

Lists are created using square brackets:

List Items Order cannot be changed.

It can have duplicate values.


Example


























List Length

use the len() function:
















A list can contain different data types:
















 lists are defined as objects with the data type 'list':























The list() Constructor

Using the list() constructor to make a List:







Access List Items


You can access them by referring to the index number. The index number starts with 0












Negative Indexing


-1 refers to the last item, -2 refers to the second last item etc.













Range of Indexes


You can specify a range of indexes by specifying where to start and where to end the range.














Return the third, fourth, and fifth item:




















We can also ignore the list , by ignoring with the :Index


Example


thislist = ["a", "b", "c",1,2,True,"a","d","c"]
print(thislist)
print(thislist[:3])
#This will return the items from index 0 to index 3











thislist = ["a", "b", "c",1,2,True,"a","d","c"]
print(thislist)
print(thislist[3:])
#This will return the items from index 3 to index end
















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Python -3

  Lists It is used to store Collection of data. Lists are created using square brackets: List Items Order cannot be changed. It can have dup...