Array Methods (Python)

Python has a set of built-in methods that you can use on lists/arrays.

• append()

Adds an element at the end of the array/list

import array as ar
a= ar.array('i',[1,2,3,5])
a.append(7)
print(a)
#output:  array('i',[1,2,3,5,7])

• insert(pos, value)

Inserts an element at desired position of the array

import array 
a= array('i',[1,2,3,5])
a.insert(1,7)
print(a)
#output:  array('i',[1,7,2,3,5])

• remove(value)

To remove an element from the array.

import array 
a= array('i',[1,2,3,5])
a.remove(3)
print(a)
#output:  array('i',1,2,5])

• extend(arr)

Adding another array to a existing array using extend method

import array 
a= array('i',[1,2,3,5])
a.extend([33,55])
print(a)
#output:  array('i',[1,2,3,5,33,55])

• pop()

Pop method removes the last element in array

import array 
a= array('i',[1,2,3,5])
a.pop()
print(a)
#output:  array('i',[1,2,3])

• index(value)

To know the index of a value in an array using index(val) method.

import array 
a= array('i',[1,2,3,5])
print(a.index(3))
#output: 2

• reverse()

To reverse an array use reverse() method

import array 
a= array('i',[1,2,3,5])
a.reverse()
print(a)
#output:  array('i',[5,3,2,1])

• fromlist(list)

fromlist() is used to add a list to the end of the array. It will take a list as its input argument and the output of this function is an array with list appended at the end of the array.

import array 
a= array('i',[1,2,3,5])
a.fromlist([10,7,3])
print(a)
#output:  array('i',[1,2,3,5,10,7,3])

• count(val)

count() will tell the total number of occurrences of the given value in the array.

import array 
a= array('i',[1,2,3,3,3,3,5])
print(a.count(3))
#output:  4

Resources

• Educba