Arrays
Array is a collection of similar elements. Elements in the array can be accessed by index. Index starts with 0. Array can be handled in python by module named array
Syntax to import array
import arraySyntax to create array
Array_name = module_name.function_name(‘datatype’,[elements])Example: Program to find sum of elements in array
import array
sum = 0
a = array.array('i',[1,2,3,4])
for i in a:
sum = sum + i
print ("sum=",sum)Output
sum= 10To add items from list into array using fromlist( ) methodfromlist( ) function is used to append list to array
Syntax
arrayname.fromlist(list_name)import array
a = array.array('i',[1,2,3,4])
c=[44,55,66]
a.fromlist(c)
print("New array: ",a)Output,
New array: array('i', [1, 2, 3, 4, 44, 55, 66])Methods in Array
array
This function is used to create an array with data type and a list as specified in the argument
Syntax
array(data type, value in a list)Example
array(‘i’,[10,20,30,40])append
The append( ) method is used to add the element at the end of the array
Syntax
append( )Example
import array
a = array.array('i',[10,20,30,40])
a.append(6)
print("New Array:",a)Output
New Array: array('i', [10, 20, 30, 40, 6])insert
The method insert( ) adds the element at the specified index
Syntax
insert(index,element)Example
import array
a = array.array('i',[10,20,30,40])
a.insert(1,100)
print("New Array:",a)Output
New Array: array('i', [10, 100, 20, 30, 40])pop
The method pop( ) removes the element at the position mentioned in its argument and returns it
pop(index)Example
import array
a = array.array('i',[10,20,30,40])
a.pop(1)
print("New Array:",a)Output
New Array: array('i', [10, 30, 40])index
The method index( ) returns the index of the element specified as argument
import array
a = array.array('i',[10,20,30,40])
print("Index of 20:",a.index(20))Output
Index of 20: 1reversed
The method reversed( ) when passed with an array returns an iterable with elements in reverse order
Syntax
reversed( )Example
import array
a = array.array('i',[10,20,30,40])
print("Original array:",a)
res_arr=array.array('i',reversed(a))
print("Reversing array:",res_arr)Output
Original array: array('i', [10, 20, 30, 40])
Reversing array: array('i', [40, 30, 20, 10])count
The method count( ) returns number of times the element specified in the argument is present in the array
Syntax
count( element)Example
import array
a = array.array('i',[10,20,30,40,30])
print("Number of elements:",a.count(30))Output
Number of elements: 2 
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