Python - 3.7

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Meaning of a List in Python?

In Python, a list is a collection of different data types. It is structured and allows for replication of access. We use square brackets to indicate that the text is a list. Additionally, a "comma" is used to separate each part.

The behaviour of a list is the same as that of any other array recognised by other computer languages. To use stacks and queues in Python, lists are required. They are changeable types, these lists. Therefore, even after a list is provided, the elements can still be changed.

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List Definition

Example:

CODE SNIPPET TO CREATE AND PRINT A LIST

OUTPUT:

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

The components of several classes can be stacked using this approach in a single list.

One needs have a solid understanding of Python's indexing in order to know which elements to delete from the available List.

Indexing:

TYPES OF INDEXING

We use the index values to ingest a value from a list. The code to extract the letter 'k' from the list containing the letters 'b,g,k,l,m' is provided below.

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

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

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Output

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

OUTPUT

• Ex 1: Remove element from the list

  CODE FOR REMOVING AN ELEMENT FROM A LIST

  
  

  Output

  
• 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 summarise, the pop() method removes the item at a provided index and rebounds it; the remove () method removes the first identical equivalent instead of a stated index; and the del operator simply deletes the element at a stated index.

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