Array in Python Set 2

Array in Python | Set 2 (Important Functions)

Here are some more functions related.

1. typecode :- This function returns the data type by which array is initialised.

2. itemsize :- This function returns size in bytes of a single array element.

3. buffer_info() :- Returns a tuple representing the address in which array is stored and number of elements in it.

# Python code to demonstrate the working of 

# typecode, itemsize, buffer_info()

   

# importing "array" for array operations

import array

   

# initializing array with array values

# initializes array with signed integers

arr= array.array('i',[1, 2, 3, 1, 2, 5]) 

  

# using typecode to print datatype of array

print ("The datatype of array is : ")

print (arr.typecode)

  

# using itemsize to print itemsize of array

print ("The itemsize of array is : ")

print (arr.itemsize)

  

# using buffer_info() to print buffer info. of array

print ("The buffer info. of array is : ")

print (arr.buffer_info())




output :

i
The itemsize of array is : 
4
The buffer info. of array is : 
(1842845731384, 6)

Note -

Instead of import array, we can also use * to import array.




# importing "array" using * for array operations from array import *     # initializing array with array values # initializes array with signed integers arr = array('i',[1, 2, 3, 1, 2, 5])     print(arr) output : array('i', [1, 2, 3, 1, 2, 5])

4. count() :- This function counts the number of occurrences of argument mentioned in array.

5. extend(arr) :- This function appends a whole array mentioned in its arguments to the specified array.

# Python code to demonstrate the working of 

# count() and extend()

   

# importing "array" for array operations

import array

   

# initializing array 1 with array values

# initializes array with signed integers

arr1 = array.array('i',[1, 2, 3, 1, 2, 5]) 

  

# initializing array 2 with array values

# initializes array with signed integers

arr2 = array.array('i',[1, 2, 3]) 

  

# using count() to count occurrences of 1 in array

print ("The occurrences of 1 in array is : ")

print (arr1.count(1))

  

# using extend() to add array 2 elements to array 1 

arr1.extend(arr2)

  

print ("The modified array is : ")

for i in range (0,9):

    print (arr1[i])




output :




The occurrences of 1 in array is : 
2
The modified array is : 
1
2
3
1
2
5
1
2
3




6. fromlist(list) :- This function is used to append a list mentioned in its argument to end of array.

7. tolist() :- This function is used to transform an array into a list.

# Python code to demonstrate the working of 

# fromlist() and tolist()

   

# importing "array" for array operations

import array

   

# initializing array with array values

# initializes array with signed integers

arr = array.array('i',[1, 2, 3, 1, 2, 5]) 

  

# initializing list

li = [1, 2, 3]

  

# using fromlist() to append list at end of array

arr.fromlist(li)

  

# printing the modified array

print ("The modified array is : ",end="")

for i in range (0,9):

    print (arr[i],end=" ")

  

# using tolist() to convert array into list

li2 = arr.tolist()

  

print ("\r")

  

# printing the new list

print ("The new list created is : ",end="")

for i in range (0,len(li2)):

    print (li2[i],end=" ")







output :




The modified array is : 1 2 3 1 2 5 1 2 3 
The new list created is : 1 2 3 1 2 5 1 2 3 




In this article i have given an introduction on array and functions.




Next Article : Variable, Expression, Condition and Functions




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                                      Array in Python Set 1