Arrays

import array as arr 

ordered, mutable collections, type restricted

link - docs.python.org/3/library/array.html 

my_array = [] 
if my_array: 
    print("Array has items") 
else: 
    print("Array is empty.") 

my_array = [10, 10, 20, 1, 1] 
if my_array: 
    print("Array has items") 
else: 
    print("Array is empty.") 

The square brackets are also printed

names = ["Alice", "Bob", "Carol"] 
print(names)    #= ['Alice', 'Bob', 'Carol']  

accessing First Araay

a = arr.array('i', [1, 2, 3])  
print(a[0])                      #= 1 

adding element to array

a = arr.array('i', [1, 2, 3])  
a.append(5) 
print(a)                         #= array('i', [1, 2, 3, 5])  

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

for i in range(0, 3): 
    print(a[i], end=" ")          #= 1 2 3 

a = arr.array('i', [1, 2, 3])  
print(*a)                         #= 1 2 3 

Insert 4 at index 1

a = arr.array('i', [1, 2, 3])  
a.insert(1, 4) 
print(*a)                         #= 1 4 2 3 

a = arr.array('i', [1, 2, 3, 4, 5, 6])  
print(a[0])                                          #= 1 
print(a[3])                           #= 4 

b = arr.array('d', [2.5, 3.2, 3.3])  
print(b[1])                              #= 3.2 
print(b[2])                              #= 3.3 

remove first occurance of 1

a = array.array('i', [1, 2, 3, 1, 5])  
a.remove(1) 
print(a)                        #= array('i', [2, 3, 1, 5])  

remove item at index 2

a = array.array('i', [1, 2, 3, 1, 5])  
a.pop(2) 
print(a)                         #= array('i', [2, 3, 5])  

slicing an array

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
b = arr.array('i', a)  
res = a[3:8] 
print(res)                 #= [4, 5, 6, 7, 8] 

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
res = a[5:] 
print(res)               #= [6, 7, 8, 9, 10] 

a = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] 
res = a[:] 
print(res)      #= [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]