# Collections.namedtuple()

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#
#   collections.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:
#   1. Columns can be in any order. IDs, marks, class and name can be written in any order in the spreadsheet.
#   2. 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 contains 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
#   Can you solve this challenge in 4 lines of code or less?
#   NOTE: There is no penalty for solutions that are correct but have more than 4 lines.
#
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