- If we want to represent a group of individual objects as a single entity where insertion order preserved and duplicates are allowed, then we should go for List.
Properties
- Insertion order preserved.
- Duplicate objects are allowed.
- Heterogeneous objects are allowed.
- List is dynamic, it means based on our requirement we can increase or decrease the size.
Remark
- In list the elements will be placed within square brackets and with comma separator.
- We can differentiate duplicate elements by using index and we can preserve insertion order by using index. Hence index will play very important role.
- Python supports both positive and negative indexes. +ve index means from left to right where as negative index means right to left.
- List object are mutable i.e. we can change the content.
Creation of List Object
- By following methods we can create list object.
Create empty list
Python
list=[]
print(list)
print(type(list))Output
PowerShell
[]
<class 'list'>With static input
- If we know elements already then we can create list as follows
Python
list=[10,20,30,40]
print(list)
print(type(list))Output
PowerShell
[10, 20, 30, 40]
<class 'list'>With dynamic input
Python
list=eval(input("Enter List:"))
print(list)
print(type(list))Output
PowerShell
Enter List:[10,20,30,40]
[10, 20, 30, 40]
<class 'list'>With list() function
Python
l=list(range(0,10,2))
print(l)
print(type(l))Output
PowerShell
[0, 2, 4, 6, 8]
<class 'list'>Example
Python
s="ajay"
l=list(s)
print(l)Output
PowerShell
['a', 'j', 'a', 'y']With split() function
Python
s="Learning Python is very very easy !!!"
l=s.split()
print(l)
print(type(l))Output
PowerShell
['Learning', 'Python', 'is', 'very', 'very', 'easy', '!!!']
<class 'list'>Remark
- Sometimes we can take list inside another list, such type of lists are called nested lists. example [10,20,[30,40]]
Ungraded Questions
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