Python Arrays: An array is a data structure that contains a group of elements. Python arrays are commonly used to organize data so that the related set of values can be easily sorted and searched. These are used to store multiple values in one single variable. You can access the variables by referring to an index number.
Example
mobiles=["Redmi","Vivo","Asus"]
Python Arrays
Python Access
You can access any value using the index number. The index values start from ‘0’ but not 1.
Access Example
x=mobiles[0]
Output: Redmi
append( )
The append( ) function is used to add the value which was mentioned in the arguments at the end of the array.
| Operation | Operator | Description |
|---|---|---|
| indexed access | a[i] | ith element |
| indexed assignment | a[i] = x | replace ith element |
| iteration | for v in a; | assign v to each of the elements in a[ ] |
| slicing | a[i:j] | a new array [a[i], a[i+1],…,a[j-1]] |
| Operation | Function call | Description |
|---|---|---|
| length | len(a) | number of elements in a[ ] |
| sum | sum(a) | sum of elements in a[ ] |
| minimum | min(a) | a minimum element in a[ ] |
| maximum | max(a) | a maximum element in a[ ] |
insert (i, x)
The function is to add the value at the position specified in its arguments.
Example
# Python code to demonstrate the working of
# array(), append(), insert()
# importing "array" for array operations
import array
# initializing array with array values
# initializes array with signed integers
arr = array.array('i', [1, 2, 3])
# printing original array
print ("The newely created array is : ",end=" ")
for i in range (0, 3):
print (arr[i], end=" ")
print("\r")
# using append() to insert new value at end
arr.append(4);
# printing appended array
print("The appended array is : ", end="")
for i in range (0, 4):
print (arr[i], end=" ")
# using insert() to insert value at specific position
# inserts 5 at 2nd position
arr.insert(2, 5)
print("\r")
# printing array after insertion
print ("The array after insertion is : ", end="")
for i in range (0, 5):
print (arr[i], end=" ")
Output
The newely created array is:1 2 3
The appended array is:1 2 3 4
The array after insertion is:1 2 5 3 4
Modify Values
You can also modify the values by index numbers.
Example
mobiles[0]="Oppo"
Output: [‘Oppo’,’Vivo’,’Asus’]
pop( )
The pop( ) function removes the element at postion mentioned in its argument and returns it.
Length of Array
By using the len( ), we can find the length of an array.
Example
x=len(mobiles)
Output: 3
Looping Elements of Array
We can use the for in loop to loop through all elements of an array.
Example
for x in mobiles:print(x)
Output
Oppo
Vivo
Asus
Adding Array elements
You should use the append( ) method to add an element.
Example
mobiles.Append(Nokia)
Output: [‘Oppo’,’Vivo’,’Asus’,’Nokia’]
Removing Array Elements
We can use the pop( ) method to remove an element.
Example
mobiles.pop(1)
Output: [‘Oppo’, ‘Asus’]
You can also use the remove( ) to remove the element from Array.
Example
mobiles.remove['Asus']
Output: [‘Oppo’, ‘Vivo’]
Array Methods( )
Python has a set of built-in methods that you can use on Arrays.
| Method | Description |
|---|---|
| append( ) | Adds an element at the end of the list |
| clear( ) | Removes all the elements from the list |
| copy( ) | Returns a copy of the list |
| count( ) | Returns the number of elements with the specified value |
| extend( ) | Add the elements of a list (or any iterable), to the end of the current list |
| index( ) | Returns the index of the first element with the specified value |
| 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 |