Array in Python | Set 1 (Introduction and Functions)
Below are some more functions.
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()) |
The datatype of array is : i The itemsize of array is : 4 The buffer info. of array is : (29784224, 6)
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) |
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]) |
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=" ") |
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
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