Collections.namedtuple()- HackerRank Solution

 Collections.namedtuple()- HackerRank Solution

 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

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Task

Dr. John Wesley has a spreadsheet containing a list of student's , ,  and .

Your task is to help Dr. Wesley calculate the average marks of the 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 , the total number of students.
The second line contains the names of the columns in any order.
The next  lines contains the , ,  and , under their respective column names.

Constraints

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 = 

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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Exceptions- HackerRank Solution

 Exceptions- HackerRank Solution

  Errors detected during execution are called exceptions.

Examples:

ZeroDivisionError
This error is raised when the second argument of a division or modulo operation is zero.

>>> a = '1'
>>> b = '0'
>>> print int(a) / int(b)
>>> ZeroDivisionError: integer division or modulo by zero

ValueError
This error is raised when a built-in operation or function receives an argument that has the right type but an inappropriate value.

>>> a = '1'
>>> b = '#'
>>> print int(a) / int(b)
>>> ValueError: invalid literal for int() with base 10: '#'

To learn more about different built-in exceptions click here.

Handling Exceptions

The statements try and except can be used to handle selected exceptions. A try statement may have more than one except clause to specify handlers for different exceptions.

#Code
try:
    print 1/0
except ZeroDivisionError as e:
    print "Error Code:",e

Output

Error Code: integer division or modulo by zero

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Task

You are given two values  and .
Perform integer division and print .

Input Format

The first line contains , the number of test cases.
The next  lines each contain the space separated values of  and .

Constraints

Output Format

Print the value of .
In the case of ZeroDivisionError or ValueError, print the error code.

Sample Input

3
1 0
2 $
3 1

Sample Output

Error Code: integer division or modulo by zero
Error Code: invalid literal for int() with base 10: '$'
3

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