Unpacking a list in Python
Unpacking of list in Python :
In Python, there is a feature of the List that assigns the right-hand side values to the left-hand side. In another way, it is called unpacking of a List in Python. In packing, we put values into a new list while in unpacking we extract those values into a single variable.
Example :
- ( a, b, c ) = list_name.
List :
A list is a data structure in Python that is a mutable, or changeable, ordered sequence of elements. Each element or value that is inside of a list is called an item.
Code 1 :
Run
# Program to understand about # packing and unpacking in Python # this lines PACKS values # into variable a as list type a = ['Hi', 999, 'Prepsters'] # this lines UNPACKS values # of variable a (wel_w, num, org) = a print(wel_w) print(num) print(org)
Output :
Hi
999
Prepsters
- Sometimes there are n numbers of input in one line, which contains one or more variable at any end and an array of number or string. Here we can use this property (Unpacking a List in Python) which simplifies our work.
- Python uses a special syntax to pass optional arguments (*args) for List unpacking. This means that there can be any numbers of arguments in place of (*args). We can use any variable name in place of “*args”.
Code 2 :
Run
# Program to understand about
# packing and unpacking in Python
#any number of input let's say it contains number in array , then array and then maximum value of array
ax=list(map(int,input().split()))
print('The given List: ',ax)
#n will be size of array *a will be the array and c will be the maximum of array
#value of at index 0 will be assigned to n and value at last index of ax will be assigned to c and rest will be assigned to a
#type of a will be list
n,*a,c=ax
print('The size of array: ',n)
print('array: ',a)
print('Max of the array: ',c)
Output :
The given List: [4, 5, 4, 2, 7, 7]
The size of array: 4
array: [5, 4, 2, 7]
Max of the array: 7
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