Learn Python 3 Object Oriented Programming Useful Library Part II

Learn Python 3

Useful Library Part II

Imagine that your friend wrote a useful library with hundreds of functions and put them on Github for anyone else to use.

Imagine that the code your friend wrote is all contains in a single file called UsefulLibrary.py and once you open the file, there is a single class called 'UsefulLibrary'. You like what your friend wrote so much that you have been using this file for multiple projects you've started.

For a new project you're starting, you decide that you want to add a few additional methods/functions to this library. How would you go about doing this?

Would you open UsefulLibrary.py and edit the file directly, adding a few methods there in the file? If you were to do that, what would happen if your friend later released a newer version of the library and updated some functions?

An ideal way to do something like this is simply for you to create another file and have it extend UsefulLibrary class.

For example, you would do:

class UsefulAddons(UsefulLibrary):
    # new methods here<div class="preloader">

For this challenge, we want you to get a glimpse on how extending a class works.

For now, imagine that you were given the following class:

class UsefulLibrary:
    def add(self, x, y):
        return x+y
    def multiply(self, x, y):
        return x*y<br><div class="preloader">

For simplicity, we'll keep UsefulLibrary small but imagine that this, in the real world, could have hundreds of functions within the class.

Now, imagine that you wanted to create a new class called UsefulAddons that extends from UsefulLibrary. However, you want to do these three activities:

You want to replace add so that it would also accept a list of numbers also. For example. add([1,2], [2,3,4]) should return 1+2+2+3+4 = 12. If x and y are both integers, call the parent's 'add' method instead.
You also want to replace multiply so that it would also accept a list of numbers also. For example, multiply([1,2,3], [1,5,10]) would return [1, 10, 30]. If x and y are both integers, call the parent's 'multiply' method instead. If x and y are both 'lists' but have unequal length, have multiply return False.
You want to add a new method called 'analyze' that given a list, it returns the minimum value, maximum value, count of total values, and the sum of its values in a dictionary. For example, analyze([1,2,5]) would return a dictionary that looks like this: { "minimum": 1, "maximum": 5, "count": 3, "sum": 8 }

(0/3) Solved

class UsefulLibrary:
    def add(self, x, y):
        return x+y
    def multiply(self, x, y):
        return x*y

class UsefulAddons(UsefulLibrary):

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# Enter code below
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ul = UsefulAddons()

Test Cases (0/11)

ul.add([1,2], [2,3,4]) to return 12
ul.add(10,23) to return 33
ul.multiply([1,2,3], [1,5,10]) to return [1, 10, 30]
ul.multiply(2,5) to return 10
ul.multiply([1,2], [1,5,10]) to return False
ul.analyze([1,2,5])['max'] to return 5
ul.analyze([1,2,5])['min'] to return 1
ul.analyze([1,2,5])['count'] to return 3
ul.analyze([1,2,5])['sum'] to return 8
ul.analyze([-1,-2,-5])['max'] to return -1
ul.analyze([-1,-2,-5])['min'] to return -5

Output

Michael

Test Cases (0/11)

Output

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