Getting started with PYTHON!!! #3- DATA STRUCTURES : Lists

Hello People, in my previous blog I talked about Identifiers,Keywords and Literals . In this blog we'll learn about the data-type known as Lists.

When we talk about lists, the first thing that comes to our mind is that it refers to a collection of data in an ordered manner so that we can access those data by their order of occurance (position number). A list is denoted by a pair of square brackets []. Here, the ordering starts from 0 (we start counting the first element of the list at zeroth position).

LIST : It is one of the 4 data-types in python used to store multiple data in a single variable.

list1=[1,2,3,4]
print(list1)    #prints the entire list.

Output

 [1,2,3,4]

How to access list elements?

• List elements can be accessed by their position.

list1=[1,2,3,4]
print(list1[0])    #prints the first element of the list, i.e. , 1.

Output

 [1]

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• The elements of a list can be modified at any point of time. and can contain duplicate items.

list1=[1,2,3,4]
list1[0]=4
print(list1)    #contains duplicate items at zeroth position and third position, i.e. , 4

Output

 [4]

• A single list may contain a variety of literals such as string literal, numeric literal, floating literal, character literal or boolean literal.

list1=[1, "Hello", 1.4, "c", True ]
print(list1)

Output

 [1, "Hello", 1.4, "c", True ]

List Length :

• the length of a list can be found out using the len() function.

list1=[1, "Hello", 1.4, "c" ]
print(len(list1))

Output

 4

List constructor :

• we can also define list using list() as shown below.

list1=list(1,2,3,4)
print(list1)

Output

 [1,2,3,4]

You must know this :

You can check the data-type using type() function.

list1=[]
print(type(list1))

Output

 <class 'list'>