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Add functional exercises, mark academic ex extra
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jag1g13 committed Oct 14, 2019
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4 changes: 2 additions & 2 deletions _episodes/02-functional.md
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Expand Up @@ -367,7 +367,7 @@ print(reduce((lambda a, b: a + b), l))
> ~~~
> {: .output}
>
> > # Solution
> > ## Solution
> >
> > ~~~
> > from functools import reduce
Expand Down Expand Up @@ -398,7 +398,7 @@ print(reduce((lambda a, b: a + b), l))
> ~~~
> {: .output}
>
> > # Solution
> > ## Solution
> >
> > ~~~
> > from functools import reduce
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244 changes: 205 additions & 39 deletions _episodes/04-functional-python.md
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Expand Up @@ -247,45 +247,57 @@ for i in count_to_n(5):
~~~
{: .output}

Counting papers from academics

Sorting papers by title, day

Needs to end day with 2d array of papers published per person per day - run a simulation of people publishing on random days

~~~
class Person:
def __init__(self, name):
self.name = name
def __str__(self):
return self.name
class Academic(Person):
def __init__(self, name):
super().__init__(name)
self.papers = []
self.staff = []
def write_paper(title, day):
new_paper = Paper(title, day)
self.papers.append(new_paper)
return new_paper
def add_staff(academic):
if academic not in self.staff:
self.staff.append(academic)
academics = [Academic(name) for name in ['Alice', 'Bob', 'Carol', 'David']]
alice = academics[0]
bob = academics[1]
alice.add_staff(bob)
~~~
{: .language-python}

> ## Extending Academic Model
>
> Optional example - doesn't need to be included.
> Counting papers from academics.
>
> ~~~
> class Person:
> def __init__(self, name):
> self.name = name
>
> def __str__(self):
> return self.name
>
> class Academic(Person):
> def __init__(self, name):
> super().__init__(name)
> self.papers = []
> self.staff = []
>
> def write_paper(title):
> new_paper = Paper(title)
>
> self.papers.append(new_paper)
> return new_paper
>
> def add_staff(academic):
> if academic not in self.staff:
> self.staff.append(academic)
>
> @property
> def all_papers(self):
> papers = self.papers
> for staff in self.staff:
> papers = papers + staff.all_papers
>
> return papers
>
>
> academics = [Academic(name) for name in ['Alice', 'Bob', 'Carol', 'David']]
> alice = academics[0]
> bob = academics[1]
> alice.add_staff(bob)
>
> alice.write_paper('A science paper')
> bob.write_paper('Another science paper')
>
> print(alice.all_papers)
>
> ~~~
> {: .language-python}
{: .callout}
## Decorators
Function that accepts a function and returns a (different) function
Expand All @@ -312,5 +324,159 @@ World!
~~~
{: .output}
> ## Sum of Squares (Again)
>
> Instead of using the `map` and `filter` functions, write a sum of squares function using comprehensions.
>
> You may find the `sum` function useful - it sums all items in an iterable collection.
>
> ~~~
> def sum_of_squares(l):
> # Your code here
>
> print(sum_of_squares([0]))
> print(sum_of_squares([1]))
> print(sum_of_squares([1, 2, 3]))
> print(sum_of_squares([-1]))
> print(sum_of_squares([-1, -2, -3]))
> ~~~
> {: .language-python}
>
> ~~~
> 0
> 1
> 14
> 1
> 14
> ~~~
> {: .output}
>
> > ## Solution
> >
> > ~~~
> > def sum_of_squares(l):
> > squares = [x * x for x in l]
> > return sum(squares)
> > ~~~
> > {: .language-python}
> >
> {: .solution}
>
> Now let's assume we're reading in these numbers from an input file, so they arrive as a list of strings.
> Modify your function so that it passes the following tests:
>
> ~~~
> print(sum_of_squares(['1', '2', '3']))
> print(sum_of_squares(['-1', '-2', '-3']))
> ~~~
> {: .language-python}
>
> ~~~
> 14
> 14
> ~~~
> {: .output}
>
> > ## Solution
> >
> > ~~~
> > def sum_of_squares(l):
> > integers = [int(x) for x in l]
> > squares = [x * x for x in integers]
> > return sum(squares)
> > ~~~
> > {: .language-python}
> >
> > Or, using only one comprehension:
> >
> > ~~~
> > def sum_of_squares(l):
> > return sum([int(x) * int(x) for x in l])
> > ~~~
> > {: .language-python}
> >
> {: .solution}
>
> Finally, like comments in Python, we'd like it to be possible for users to comment out numbers in the input file the give to our program.
> Extend your function so that the following tests pass (don't worry about passing the first set of tests with lists of integers):
>
> ~~~
> print(sum_of_squares(['1', '2', '3']))
> print(sum_of_squares(['-1', '-2', '-3']))
> print(sum_of_squares(['1', '2', '#100', '3']))
> ~~~
> {: .language-python}
>
> ~~~
> 14
> 14
> 14
> ~~~
> {: .output}
>
> > ## Solution
> >
> > ~~~
> > def sum_of_squares(l):
> > not_comments = [x for x in l if x[0] != '#']
> > integers = [int(x) for x in not_comments]
> > squares = [x * x for x in integers]
> > return sum(squares)
> > ~~~
> > {: .language-python}
> >
> > Or, in one comprehension:
> >
> > ~~~
> > def sum_of_squares(l):
> > return sum([int(x) * int(x) for x in l if x[0] != '#'])
> > ~~~
> > {: .language-python}
> {: .solution}
>
{: .challenge}
> ## Dictionary of Squares
>
> Define a function `dict_of_squares` which takes an integer and returns a dictionary whose keys `i` are the integers from 1 to N (inclusive) and whose values are lists of square numbers up to `i` squared.
>
> For example:
>
> ~~~
> def dict_of_squares(n):
> # your code here
>
> print(dict_of_squares(3))
> ~~~
> {: .language-python}
>
> ~~~
> {1: [1], 2: [1, 4], 3: [1, 4, 9]}
> ~~~
> {: .output}
>
> > ## Solution
> > ~~~
> > def dict_of_squares(n):
> > return {i: [j * j for j in range(1, i + 1)] for i in range(1, n + 1)}
> > ~~~
> > {: .language-python}
> >
> > To improve readability, you may wish to format it differently - such as:
> >
> > ~~~
> > def dict_of_squares(n):
> > return {
> > i: [
> > j * j for j in range(1, i + 1)
> > ] for i in range(1, n + 1)
> > }
> > ~~~
> > {: .language-python}
> >
> {: .solution}
>
{: .challenge}
{% include links.md %}
15 changes: 14 additions & 1 deletion setup.md
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@@ -1,7 +1,20 @@
---
title: Setup
---
FIXME

As yesterday, we need to download the training materials from the GitHub code repository online. Go to `https://github.com/sabs-r3/module01_se_day2` in a browser and select the green `Clone or download` button, and then select `Download ZIP`. This will download all the files within a single archive file. After it's finished downloading, we need to extract all files from the archive. Find where the file has been downloaded to, then start a terminal, and assuming the file has downloaded to e.g. `/home/sabs-r3/Downloads`, do the following within the shell:

~~~
cd ~
unzip /home/sabs-r3/Downloads/module01_se_day2-gh-pages.zip
~~~
{: .language-bash}

This will unpack the archive in your home directory, within a subdirectory called `module01_se_day2-gh-pages`. Change to the `code` directory within that new directory:

~~~
cd module01_se_day2-gh-pages/code
~~~
{: .language-bash}

{% include links.md %}

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