Eroman at 17:33, 9 March 2017

2017-03-09T17:33:37Z

← Older revision		Revision as of 20:33, 9 March 2017
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	= Actions on iterables =		= Actions on iterables =

			You should know how to solve these problems for the test!

			You do not need to use a specific way, but you must understand the imperative way.

	== TASK 1 ==		== TASK 1 ==

Eroman: Created page with "= Actions on iterables = == TASK 1 == Write a function that makes all characters in a list uppercase! call it with the following list, and print the result

['cat', 'd..."

2017-03-09T17:28:44Z

Created page with "= Actions on iterables = == TASK 1 == Write a function that makes all characters in a list uppercase! call it with the following list, and print the result <pre>['cat', 'd..."

New page

= Actions on iterables =

== TASK 1 ==

Write a function that makes all characters in a list uppercase!

call it with the following list, and print the result

<pre>['cat', 'dog']</pre>
=== Solution: Imperative ===

You must know how to do this solution

<source lang="python">def uppercase_list(l):
result = []
for i in l:
result.append(i.upper())
return result</source>
=== Solution: Functional ===

<source lang="python">def uppercase_list(l):
return list(map(lambda i: i.upper(), l))</source>
=== Solution: Modern ===

<source lang="python">def uppercase_list(l):
return [i.upper() for i in l]</source>
== TASK 2 ==

Write a function that makes all character in the values of a dict uppercase!

call it with the following dict and print the results.

<pre>{'cat': 'kass', 'dog': 'koer'}</pre>
=== Solution: Imperative ===

You need to understand how this solution works

<source lang="python">def uppercase_dict_values(d):
result = {}
for k, v in d.items():
result[k] = v.upper()
return result</source>
=== Solution: Modern ===

<source lang="python">def uppercase_dict_values(d):
return {k: v.upper() for k, v in d.items()}</source>
== TASK 3 ==

write a function that filters out numbers divisible by 3 and 5<br />
call it with <code>range(0, 30)</code>

=== Solution: Imperative ===

<source lang="python">def exclude_divisible_by_3_and_5(l):
result = []
for i in l:
if not (i % 3 == 0 or i % 5 == 0):
result.append(i)
return result</source>
=== Solution: Functional ===

<source lang="python">def is_not_divisible_by_3_and_5(n):
if not (n % 3 == 0 or n % 5 == 0):
return True
else:
return False

def exclude_divisible_by_3_and_5(l):
result = filter(is_not_divisible_by_3_and_5, l)
return list(result)</source>
== Slicing ==

<source lang="python">In [1]: a = "Hello World"

In [2]: a[:2]
Out[2]: 'He'

In [3]: a[2:]
Out[3]: 'llo World'

In [4]: a[-2:]
Out[4]: 'ld'

In [5]: a[:-2]
Out[5]: 'Hello Wor'

In [6]: a[:-2:2]
Out[6]: 'HloWr'

In [7]: a[::2]
Out[7]: 'HloWrd'

In [8]: a[::-1]
Out[8]: 'dlroW olleH'</source>
== TASK 4 ==

write a function that sorts numbers in a list by the smallest digit of the integer.<br />
i.e.

<source lang="python">my_list = [11, 10, 9, 177, 199]
my_sort_function(my_list)
[10, 11, 177, 9, 199]</source>
=== Solution ===

<source lang="python">def reverse_digit_order(n):
"""Revere the order of the digits in a number"""
return str(n)[::-1]

def sort_list_by_smallest_digit(l):
return sorted(l, key=reverse_digit_order)</source>

I719 Fundamentals of Python/lists - Revision history

Eroman at 17:33, 9 March 2017

Eroman: Created page with "= Actions on iterables = == TASK 1 == Write a function that makes all characters in a list uppercase! call it with the following list, and print the result
['cat', 'd..."