Python Lists

List:

A list is a sequence of mutable python object like float, string etc.

It defined using Square braces[].

my_list=[‘python’, 2.7,5]

Concatenation: Adding two or more lists by using + operator

#list

list1=['1','a']

list2=['b']

#concatenation

print(list1+list2)

Output:

['1', 'a', 'b']

Repetition: Using * operator, it repeats lists in given number times.

list follows * and specify the how many times repeat the given lists.

Example:

 ‘python’*2= python python

#list

list1=['1','a']

#repetition

print(list1*2)

Output: 

['1', 'a', '1', 'a']

Slicing: using : colon operation, we can access the range of item in a lists. 

#scling

list4=['a','b','c','d','e']

print(list4[1:2])

Output:

['b']

Indexing:

#indexing

list4=['a','b','c','d','e']

print(list4[1])

Output:

a

We already know concatenation, repetition ,slicing and Index. So, will learn other operations and functions in the list.

Example Program

#list

list1=['1','a']

list2=['b']

#concatenation

print(list1+list2)

#repetition

print(list1*2)

#scling

list4=['a','b','c','d','e']

print(list4[1:2])

#indexing

print(list4[1])

#append

list3=['a','b','c','d','e']

list3.append('f')

print(list3)

#extend

list3.extend(['1',’2’])

print(list3)

#insert

list3.insert(7,'h')

print(list3)

#pop

list3.pop()

print(list3)

Output:

['1', 'a', 'b']

['1', 'a', '1', 'a']

['b']

a

['a', 'b', 'c', 'd', 'e', 'f']

['a', 'b', 'c', 'd', 'e', 'f', '1']

['a', 'b', 'c', 'd', 'e', 'f', '1', 'h']

['a', 'b', 'c', 'd', 'e', 'f', '1']

 

In above example program,

Append () function:

#append

list3=['a','b','c','d','e']

list3.append('f')

print(list3)

Output: ['a', 'b', 'c', 'd', 'e', 'f']

Add/ Attach a value at last of the list. By using append() , adds ‘f’ in

the “list3” variables.

In list3 have 5 values, after using append function ‘f’ value add to 

the list3.

I hope, you will understand it.

 

Extend ():

Extend is used for adding multiple variable in the list.

Extend Operator, how it works. You are specifying whatever value 

you want in square brackets [].

#Extend

list=[1,2]

list.extend([‘c’,’d’])

print(extend)

 

Insert (index, value):

Insert operator is used to add a value at specific index.

Example:

List=[1,2,4] --> list.index(2,3)--> [1,2,3,4]

 

Pop()

Pop function used to delete a value from the list.

list=[‘a’,’b’,’c’] --> list.pop()-->[‘a’,’b’]

It removes one by one.

You can also remove specific value. Let’s see

list=[1,2,3] --> list.pop(2)-->[1,2]

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Thank you guys 💗☺👍 :)

#Python List