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Array in Python | Set 2 (Important Functions)

Last Updated : 06 Sep, 2023

Below are some more useful functions provided in Python for arrays:

This function returns the data type by which the array is initialized. In this example, we are using arr.typecode to find out the data type of array initialization.

# importing "array" for array operations
import array
   
# initializing array with array values
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)

The datatype of array is : 
i

This function returns the size in bytes of a single array element. In this example, we are using itemsize function to find out the size in byte of an array element.

# importing "array" for array operations
import array
   
# initializing array with array values
arr= array.array('i',[1, 2, 3, 1, 2, 5]) 
  
# using itemsize to print itemsize of array
print ("The itemsize of array is : ")
print (arr.itemsize)

The itemsize of array is : 
4

Returns a tuple representing the address in which array is stored and number of elements in it. In this example, we are using buffer_info() to do the same.

# importing "array" for array operations
import array
   
# initializing array with array values
arr= array.array('i',[1, 2, 3, 1, 2, 5]) 

# using buffer_info() to print buffer info. of array
print ("The buffer info. of array is : ")
print (arr.buffer_info())

The buffer info. of array is : 
(140491260368688, 6)

Python count() function counts the number of occurrences of argument mentioned in array.

This function appends a whole array mentioned in its arguments to the specified array. In this example, we are using extend() to append another array.

# importing "array" for array operations
import array
   
# initializing array with array values
arr1 = array.array('i',[1, 2, 3, 1, 2, 5]) 
arr2 = array.array('i',[1, 2, 3]) 

# 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], end=" ")

The modified array is : 
1 2 3 1 2 5 1 2 3 

This function is used to append a list mentioned in its argument to end of array. In this example, we are using fromlist() to append a list to end of array.

# importing "array" for array operations
import array
   
# initializing array with array values
arr = array.array('i',[1, 2, 3, 1, 2, 5]) 
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=" ")

The modified array is : 1 2 3 1 2 5 1 2 3 

This function is used to transform an array into a list. In this example, we are using tolist() to convert an array to list.

# importing "array" for array operations
import array
   
# initializing array with array values
arr = array.array('i',[1, 2, 3, 1, 2, 5]) 
  
# using tolist() to convert array into list
li2 = arr.tolist()
  
# printing the new list
print ("The new list created is : ",end="")
for i in range (0,len(li2)):
    print (li2[i],end=" ")

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

Arrays - Part 2 Python Programming

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