Filter elements of a tuple based on a value in a certain index

Question

Filter elements of a tuple based on a value in a certain index

Navigation

#1 by (3 votes)

0

I want to write a function in Python, call separates, which receives a tuple tup whose elements are pairs (double of 2 elements), where the 1st element is a name (a string) and the 2nd element is an age (an integer), as described in the previous exercise.

The function should return 1 tuple with two elements:

1 tuple with the elements of the original tuple where the age is less than 18.
1 tuple with the elements of the original tuple where the age is greater than or equal to 18.
Your function should check if the argument you received is correct (use exercise 1 function to do this check). If the argument is not correct, an error should be generated with the raise statement ValueError ('separa: argument incorrect.').

Example:

>>> tup = (('Maria', 38), ('Miguel', 17), ('Tiago', 18), ('Sara', 19))
>>> menores, maiores = separa(tup)
>>> menores
(('Miguel', 17),)
>>> maiores
(('Maria', 38), ('Tiago', 18), ('Sara', 19))

>>> separa(())
((), ())

>>> separa((('Maria', 38), ('Miguel', 17), ('Tiago', 18), ('Sara', 19.7)))
              ….
builtins.ValueError: separa: argumento incorrecto.

python

asked by anonymous 07.11.2018 / 03:06

1 answer

Button CSS on tablet is not as shown on PC and in Responsive Design Mode What is the difference between string.split (',') and string.rsplit (',') in python?

score 3 · Answer 1

If you have a tuple in the form

valores = (('Maria', 38), ('Miguel', 17), ('Tiago', 18), ('Sara', 19))

You can list the items that have the second value less than 18 as follows:

menores = tuple(it for it in valores if it[1] < 18)

And greater than or equal to 18 in a similar way:

maiores = tuple(it for it in valores if it[1] >= 18)

So, considering the verifica function, which was defined in the previous exercise - that is, let's consider that you already did the previous exercise and have this function working (its implementation is not part of this question), you can write a function in the form:

def separa(tuplo):
    if not verifica(tuplo):
        raise ValueError(’separa: argumento incorrecto.’)

    menores = tuple(it for it in tuplo if it[1] < 18)
    maiores = tuple(it for it in tuplo if it[1] >= 18)

    return (menores, maiores)