HackerRank Python Solution - Collections Topic - namedtuple()

• Basically, namedtuples are easy to create, lightweight object types.

• They turn tuples into convenient containers for simple tasks.

• With namedtuples, you don’t have to use integer indices for accessing members of a tuple.

Example:

Code 01:

>>> from collections import namedtuple
>>> Point = namedtuple('Point','x,y')
>>> pt1 = Point(1,2)
>>> pt2 = Point(3,4)
>>> dot_product = ( pt1.x * pt2.x ) +( pt1.y * pt2.y )
>>> print dot_product
11

Code 02:

>>> from collections import namedtuple
>>> Car = namedtuple('Car','Price Mileage Colour Class')
>>> xyz = Car(Price = 100000, Mileage = 30, Colour = 'Cyan', Class = 'Y')
>>> print xyz
Car(Price=100000, Mileage=30, Colour='Cyan', Class='Y')
>>> print xyz.Class
Y

Task:

• Dr. John Wesley has a spreadsheet containing a list of student's IDs, marks, class, and name.

• Your task is to help Dr. Wesley calculate the average marks of the students.

• Average = Sum of all marks / Total Students

• Note:

• Columns can be in any order. IDs, marks, class, and name can be written in any order in the spreadsheet.

• Column names are ID, MARKS, CLASS, and NAME. (The spelling and case type of these names won't change.)

Input Format:

• The first line contains an integer N, the total number of students.

• The second line contains the names of the columns in any order.

• The next N lines contain the marks, IDs, name, and class, under their respective column names.

Constraints:

• 0 < N <= 100

Output Format:

Print the average marks of the list corrected to 2 decimal places.

Sample Input:

TESTCASE 01:

5
ID         MARKS      NAME       CLASS     
1          97         Raymond    7         
2          50         Steven     4         
3          91         Adrian     9         
4          72         Stewart    5         
5          80         Peter      6   

TESTCASE 02:

5
MARKS      CLASS      NAME       ID        
92         2          Calum      1         
82         5          Scott      2         
94         2          Jason      3         
55         8          Glenn      4         
82         2          Fergus     5

Sample Output:

TESTCASE 01:

78.00

TESTCASE 02:

81.00

Explanation:

TESTCASE 01:

• Average = (97 + 50 + 91 + 72 + 80)/5

Solution:

from collections import namedtuple

N = int(input())

Std_lst = []

for i in range(N+1):
    
    if i == 0:
        header = input()
        Students = namedtuple('Students',header)
    else:
        student = input().split()
        Std_lst.append(Students(student[0],student[1],student[2], student[3]))

std_sum = 0
for std in Std_lst:
    std_sum += int(std.MARKS)

print(std_sum/N)

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