Skip to main content

-List Slicing in Python-


 List Slicing :

Slicing helps in creating a new list from an existing list. 

Syntax list_name [start:end:step]




Suppose you have a list of Avengers, arranged in the order of your preference.

 avengers=[“Iron Man”,”Thor”,”Hulk”,”Spider Man”,”Captain America”,”Black Panther”,”Hawk Eye”,”Vision”,”Black Widow”]
Later you decide to split them into a separate list like 
favourite=[“Iron Man”,”Thor”,”Hulk”] 
                                                 less_favourite =[”Spider Man”,”Captain America”,”Black Panther”]
                            least_favourite=[”Hawk Eye”,”Vision”,”Black Widow”] 

Now, we have 3 lists formed from the main list. Would you want to create these lists again from the beginning? This is where list slicing helps us.

Here is the code to Get the last few elements of a list.


code to Get the first few elements of a list.



code to Get the numbers within a range.
code to Get elements within a range using the step.

code to Get the reverse list.










Creating the list of our favorite avengers in the order of preference.
 Note: Below slicing will work only if the original list contains 9 elements 







Creating a list of favorite avengers from it and print it. (assuming the first 3 are the most favorites) 







Creating another list of avengers who are less favorite than the above. (assuming the middle 3)






Create a list of least favorite avengers (last 3) 










Creating a list containing every second avenger from the main list. 







Printing the main avenger's list in reverse ie from least favorite to most favorite.


Comments

Popular posts from this blog

- For loop in Python -

Loops: Loops are control structures used to repeat a given section of code  ● a certain number of times or  ● until a particular condition is met.  How do we keep ourselves fit nowadays? We must be doing some exercises ..right?   The steps followed in doing the exercise are repeated many times ..isn’t it? Depending on the fitness level of the person, he can choose to repeat a step 10,20, or even 100 times. Now suppose, you want to write a program to simulate exercise steps. Is it feasible to write the same steps again and again? Also, how many times does it has to be repeated changes from person to person. Looping structures come to our rescue in such scenarios. Duplicating lines can be eliminated by repeating them a required number of times. ‘ for’ loop ‘for loops’ are used when you have a block of code that you want to repeat a fixed number of times. A series of numbers within a given range.  Note :  ● A range has 3 parameters -start, end, ste...

- Object Oriented Programming -

In OOP, we can represent an entity using a class.  A class bundles data (features/properties of entity - color, height, width) and functionality (movement, expression) together.  An instance of a class is known as an object.  Which is the only cartoon series that had predicted that Trump would be elected as the president of the USA and also predicted the coronavirus spread?   Answer: Simpsons.  Simpsons is a very popular animated show. You can build something similar with python.  But have you ever wondered, how Simpsons look the same in all the series? Only his movement looking and, expression change but his main features like color, height, and face look exactly the same all the time.  This is because we create a ‘blueprint’ of Simpsons and whenever we have to simulate him on screen we use this blueprint. This keeps a record of all the features of Simpsons and recreates it whenever we want.  This is where Object-Oriented Programming(OOP) h...