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Common Data Items and Methods of an Array in Python

Python | Command Data Items and Method of an Array: Here, we are going to learn about some of the common data items and methods of an array in python.
Submitted by IncludeHelp, on September 21, 2018

List of common and most useful data items and methods of an array module in python

Sr No	Data Item/Method	Description	Example (Consider a is array name)
1	array.typecode	Returns the typecode of the array	a.typecode
2	array.itemssize	Returns the item size of an element of the array	a.itemsize
3	array.append(x)	Appends x at the end of the array	a.append(100)
4	array.count(x)	Returns the occurrence of element x in the array	a.count(10)
5	array.index(x)	Returns the index of x in the array	a.index(10)
6	array.insert(i,x)	Inserts the element x at given index i in the array	a.insert(2,10)
7	array.pop(i)	Removes the item from the index i and returns the element	a.pop(2)
8	array.remove(x)	Removes the first occurrence of element x in the array	a.remove(20)
9	array.reverse()	Reverses the elements of the array	a.reverse()
10	array.tolist()	Converts array to a list with same items	a.tolist()

Python program demonstrating use of all above-written data items and methods

# imporating array module to use array 
import array as arr


# declare and initialze array of type signed int
a = arr.array ("i", [10, 20, -30, 40, -50] )

# typecode
print ("Typecode of a: ", a.typecode)

# itemsize
print ("Item size of an element: ", a.itemsize);

# append new item at the end of the array 
a.append(60)
print ("Elements: ", a);

# array count(x)
print (a.count(20))

# index (X)
print ("Index: ", a.index(20))

# insert (i,x)
a.insert (2,99)
print ("Elements: ", a);

# pop (i)
print (a.pop(2), " is removed...")
print ("Elements: ", a);

# remove (x)
a.remove(-30)
print ("Elements: ", a);

# reverse
a.reverse ()
print ("Elements: ", a);

# tolist
print ("Elements (tolist): ", a.tolist ())
print ("Type of a: ", type (a))

Output

Typecode of a:  i
Item size of an element:  4
Elements:  array('i', [10, 20, -30, 40, -50, 60])
1
Index:  1
Elements:  array('i', [10, 20, 99, -30, 40, -50, 60])
99  is removed...
Elements:  array('i', [10, 20, -30, 40, -50, 60])
Elements:  array('i', [10, 20, 40, -50, 60])
Elements:  array('i', [60, -50, 40, 20, 10])
Elements (tolist):  [60, -50, 40, 20, 10]
Type of a:  <class 'array.array'>