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Python - 3.7

  • by Mr. Nitin Mishra
  • December 29, 2019
  • 147

A husband and wife are having a discussion over a cup of coffee.

'Wife':
"Dear, I am unhappy with my current job. I want to shift my career. I wish to switch to the IT field. Please recommend a good certification course that will enable me to secure employment in IT."
'Husband':
"If you are looking for an IT job, then you should choose python programming which is the most in demand. Python enables a variety of functions and flexibility to programmers."
'Wife':
"That's interesting, dear.! But the problem is - I don't have any programming skills"
'Husband':
"Not a problem, dear. Python code is very simple and easy to comprehend. Let me explain with an example. Just suppose there is a concept in Python called Lists. I can easily create lists with the help of List remove()."

 

Meaning of a List in Python?

 

A list is an assemblage of data type in python. It is organized and grants replicate access. To disclose a list, we apply the square brackets. And every element in it is separated by a ‘comma’.

 

List behaves like any other array that we acknowledge in other programming languages. Lists in python are necessary to adopt stacks and queues. These lists are mutable types. Hence, the elements can be altered even after a list is stated.

 

List Definition

python

Example:

 

CODE SNIPPET TO CREATE AND PRINT A LIST


python

OUTPUT:


python

In the above mentioned example, we have constructed a list called ‘my_List’. In this, all the components are confined within square brackets [ ] and each component is separated by a comma.

 
  • At index 0, the string element we have "jim"
  • At index 1, we have an integer 12
  • At index 2, we have a floating-point number 2.16
 

In this method, we can stack the components of different classes in a single list.

 

To remove elements from the available List one should have a fair perception about indexing in python, to understand which element to remove.

 

Indexing:

TYPES OF INDEXING

To ingress a value from a list, we adopt the index values. Below is the code to get the alphabet ‘k’ from the list containing ‘b,g,k,l,m’.

 

CODE SNIPPET TO PRINT AN ELEMENT FROM A LIST

Both the print declarations will obtain the alphabet ‘k’ from the list.

 

Python List remove():

Remove Elements from the List using:

  • remove()
  • pop()
  • del()
 

The remove() approach discards the first identical component from the list.

 

The REMOVE() FUNCTION

python

The syntax of the remove() method is:

 

list.remove(element)

 

remove() specifications

 
  • The remove() approach catches a single component as an argument and discards it from the list.

  • If the element doesn't occur, it gives a ValueError stating that the element chosen is not in the given list.
 

Return Value from remove()

 

The remove() doesn't restore any value.

 

CODE TO REMOVE AN ELEMENT FROM A LIST OF DUPLICATE ELEMENTS

python

Output

python

Here, only the first recurrence of element 'jasmine' is removed from the list.

python

OUTPUT

python
  • Ex 1: Remove element from the list
     

    CODE FOR REMOVING AN ELEMENT FROM A LIST

    python

    Output

    python
  • Example 2: remove() approach on a list having repeated elements
     

    If a list contains duplicate elements, we can remove the duplicates using the ‘remove()’ method. It removes the first matching element from the list.


  • Example 3: Deleting an element that does not exist
     

    DELETING A NON EXISTING ELEMENT-SAMPLE CODE

Here, we get an error as the list of the flowers doesn't consist of 'lilly'

 
  • If you need to delete elements depending on the index (like the third element), you can adopt the pop() approach.

  • Python del statement can also be adopted to remove elements from the list.
 

To outline, the remove() approach removes the first identical equivalent, and not a stated index; the pop() approach removes the item at a stated index, and rebounds it; and the del operator just deletes the element at a stated index.

 
'Husband':
"Well, were you able to comprehend?"
'Wife':
"Yes. Python seems so simple. I think I can pick it up easily. I enjoyed it, and I'm looking forward to joining the Certification Program in Python."
                         

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