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20121006e

Advanced sorting

Exercise 1

Consider the following records (list of tuples):

data= [ 
(001,'Albany','NY',162692),
(003,'Allegany','NY',11986),
(121,'Wyoming','NY',8722),
(123,'Yates','NY',5094)
]

Sort the records by the value of the last column.

Exercise 2

Consider the following list:

lst = ['10:User1', '80:User2', '100:User3', '00:User4', '75:User4', '45:User5']

Sort the list by user ID in descending order:

    100:User3
    80:User2
    75:User4
    45:User5
    10:User1
    00:User4

Exercise 3

Consider the following matrix:

li=[ [2,6],[1,3],[5,4] ]

Sort the rows of the matrix by the 2nd column:

[ [1, 3], [5, 4], [2, 6] ]