Python Arrays |Looping |Method ar append(), clear(), extend(), insert(), pop(), reverse(), sort(), index()


Note: Python doesn’t have intrinsical support for Arrays, however Python list may be used instead.
 
Arrays
Arrays area unit wont to store multiple values in one single variable:
 
Example
Create an array containing car names:
cars = [“Ford”, “Volvo”, “BMW”]
What is an Array?
An array may be a special variable, which can hold more than one value at a time.

 

If you’ve got an inventory of things (a list of automobile names, for example), storing the cars in single variables could look like this:
 
car1 = “Ford”
car2 = “Volvo”
car3 = “BMW”
However, what if you wish to loop through the cars and realize a selected one?
And what if you had not three cars, but 300?

 

The solution is an array!

 

An array will hold several values beneath one name, and you can access the values by referring to an index number.


Access the Elements of an Array

You see Associate in Nursing array part by pertaining to the indicant.


Example
Get the value of the first array item:
x = cars[0]
Example
Modify the value of the first array item:
cars[0] = “Toyota”
The Length of an Array
Use the len() method to return the length of an array (the number of elements in an array).
Example

Return the amount of components within the cars array:


x = len(cars)
Run example »

Note: The length of Associate in Nursing array is usually an added than the very best array index.

 

Looping Array Elements

 

You can use the for in loop to loop through all the weather of Associate in Nursing array.


Example
Print each item in the cars array:
for x in cars:
print(x)
Adding Array Elements
You can use the append() method to add an element to an array.
Example
Add one more element to the cars array:
cars.append(“Honda”)
Removing Array Elements
You can use the pop() method to remove an element from the array.
Example
Delete the second element of the cars array:
cars.pop(1)
You can also use the remove() method to remove an element from the array.
Example
Delete the element that has the value “Volvo”:
cars.remove(“Volvo”)
Note: The list’s remove() method only removes the first occurrence of the specified value.
Array Methods

Python encompasses a set of intrinsical ways that you just will use on lists/arrays.

 

Method

Description
append()

Adds a part at the top of the list


clear()
Removes all the elements from the list
copy()
Returns a copy of the list
count()

Returns the amount of components with the required worth


extend()
Add the elements of a list (or any iterable), to the end of the current list
index()

Returns the index of the primary part with the required worth


insert()
Adds an element at the specified position
pop()
Removes the element at the specified position
remove()
Removes the first item with the specified value
reverse()
Reverses the order of the list
sort()
Sorts the list

Note: Python doesn’t have intrinsical support for Arrays, however Python Lists may be used instead.
 
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