Array

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Array :

1. Array is special variable which can hold more than one value at  time 
2. Array is collection of common type of   data structures having  element with   same data type 
Why we use array ?
1. For numerical operation
2. Store data very compactly or more efficiently 
3. List can't directly  handle maths operations 
4. Tuple, list having group of value similar as array but in list and tuple have various type of data (int, float, string) but in array having same type 

import array as arr
a = arr. array('i',[1,2,3])
a.reverse() 
a[1] = -2
print(a)
print(a[2]) # indexing 
print(a[0:2]) # slicing
print(a.buffer_info()) # address and size
a.append(4) # adding new value
print(a)

# take input from user
b = arr. array('i',[ ])
n = int(input("Enter the lenght of array"))
for i in range(n):
            x = int(input("Enter the next value please"))
            b.append(x)
            print(b)

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