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Coding 101 15

Python - Sort and the YouTube API

May 1 2014

Hosts: Fr. Robert Ballecer, SJ and Shannon Morse

Guest: Dale Chase

Welcome to Coding 101 - It's the TWiT show that gives YOU the knowledge to live in the wonderful world of the programmer. This week we are introducing our newest module, Python with Code Warrior Dale Chase!

To see all the code used in today's episode, go to Our Github Repository for Module 2

** Please Note: The episode code will NOT work unless you have your own YouTube API Key. The procedure for applying for your own YouTube API key can be found here.

Let's Learn about Sorting!

Let's say I have the following list of numbers: (1, 23, 6, 4, 99)
Now I want to put that list into ascending order.
-- I need to "sort" the data into an order that will be useful to me.

I could write a function that:
1. Puts all the values into a list (rawlist)

2. Creates a NEW list (sortlist) into which I will place those values as they are sorted

3. Add the first value of (rawlist) into the first position of (sortlist)

4. Compare each successive value of "rawlist" to the values that are already in (sortlist) and reorder (sortlist) accordingly

Here's how it would work:
1. "1" is moved from (rawlist) to (sortlist)

2. "23" from (rawlist) is compared to "1" in (sortlist). It is GREATER than "1" so it is added to (sortlist) AFTER "1"

3. "6" from (rawlist) is compared to "1" in (sortlist). It is GREATER than "1" so it is then compared to "23" in (sortlist). It is LESSER than "23", so "6" is coppied into the position after "1" in (sortlist) and "23" is moved to the position after "6" in (sortlist)

4. "4" from (rawlist) is compared against "1" in (sortlist). It is greater than "1", so it is compared against "6" in (sortlist). It is LESSER than "6", so "4" is coppied into the position after "1" in (sortlist), "6" is coppied into the position after "4" in (sortlist), and "23" is coppied into the position after "6" in (sortlist)

5. "99" (rawlist) is compared against "1"(sortlist). It is greater than "1", so it is compared against "4" (sortlist). It is greater than "4", so it is compared against "6" (sortlist). It is greater than "6", so it is compared against "23" (sortlist). It is greater than, "23", so it is added to the position after "23" (sortlist)"

Python has a built-in sorting method!
sort()
* The "sort()" method will sort a list of objects, much in the same way that we just demonstrated.
-- But we don't need to know all the logic behind the method!

Usage:
SortMe = [1, 23, 6, 4, 99]

for entries in range (0,5):
print SortMe[entries]

raw_input ("Press Enter")

SortMe.sort();

for entries in range (0,5):
print SortMe[entries]

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Download or subscribe to this show at twit.tv/code. Also, check out our transcripts.

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Running time: 45:07

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