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Common Data Items and Methods of an Array in Python
By IncludeHelp Last updated : December 21, 2024
Common Data Items and Methods of Python Array Class
List of common and most useful data items and methods of an array class in Python are:
| 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() |
Example
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'>
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