Schedule

Schedule

Wednesday, September 3

1409758200 FLOSS Weekly
1409763600 Tech News Today
1409767200 Windows Weekly
1409774400 This Week in Google
1409785200 Tech News 2Night
1409787000 redditUP
1409792400 Ham Nation

Thursday, September 4

1409850000 Tech News Today
1409853600 Know How...
1409857200 The Social Hour
1409862600 Coding 101
1409866200 Home Theater Geeks
1409871600 Tech News 2Night
1409873400 The Giz Wiz
1409882400 OMGcraft

Friday, September 5

1409936400 Tech News Today
1409940000 This Week in Law
1409947200 Android App Arena
1409958000 Tech News 2Night

Saturday, September 6

1410026400 The Tech Guy

Sunday, September 7

1410112800 The Tech Guy
1410127200 This Week in Tech

Monday, September 8

1410195600 Tech News Today
1410199200 Triangulation
1410204600 iPad Today
1410217200 Tech News 2Night
1410219000 Marketing Mavericks

Tuesday, September 9

1410282000 Tech News Today
1410285600 MacBreak Weekly
1410292800 Security Now
1410300000 Before You Buy
1410303600 Tech News 2Night
1410307200 All About Android
1410316200 Padre's Corner

Wednesday, September 10

1410363000 FLOSS Weekly
1410368400 Tech News Today
1410372000 Windows Weekly
1410379200 This Week in Google
1410390000 Tech News 2Night
1410391800 redditUP
1410397200 Ham Nation

Thursday, September 11

1410454800 Tech News Today
1410458400 Know How...
1410462000 The Social Hour
1410467400 Coding 101
1410471000 Home Theater Geeks
1410476400 Tech News 2Night
1410478200 The Giz Wiz
1410487200 OMGcraft

Friday, September 12

1410541200 Tech News Today
1410544800 This Week in Law
1410552000 Android App Arena
1410562800 Tech News 2Night

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Coding 101 14

Thrown a For Loop

April 24 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

Loops (Recap)

* As we may recall, loops are an easy way to reuse code.
* It allows us to "loop" a section of code so that it doesn't have to be writen over and over.

For Loops
For Loops use a "range" function to determine the start and the end of the loop.

Code Sample:

for counter in range(0,3):

- print counter

* Notice how the counter print statement ran from 0 - 2 and NOT 0 - 3. That's because the counter is incremented at the end of each loop and each loop does a pre-test. After the code prints "2", 1 is added to the counter. When it loops back to the range function, the counter is "3" - Since we told the loop to rune as long as we are "in range" of 0 to 3", it will no longer run. (it's the same as "<" in C#)

if/else statements
* A "if" statement evaluates an relational expression and executes a block of code if that expression is true.

Code Sample:

a = raw_input("Please enter a whole number:")

b = raw_input("Please enter a second whole number:")

if a < b:
print "a is less than b""

* A "if/else" statement evaluates a relational expression and executes a block of code if that expression is true, AND EXECUTES A DIFFERENT BLOCK OF CODE IF THAT EXPRESSION IS FALSE

Code Sample:

a = raw_input("Please enter a whole number:")

b = raw_input("Please enter a second whole number:")

if a < b:

- print "a is less than b"

elif a == b:

- print "a is equal to b"

else:

- print "b is less than a"

The Modulo (Mod) Operator
* It does a division calculator and returns the remainder of that division
* Syntax: "a%b"
* Which means, "Divide a by b, and return the value of the remainder of that division"

Sample Problem
* Find a way to decide if a user-inputed number is odd or even!
* If we wanted to know if a number is odd or even, we would use the Mod operator on a value, dividing it by 2 and checking to see what number is returned as the remainder:

If the number is "0", then we know the number was EVEN because dividing by 2 left no remainder

If the number is "1", then we know that the number was ODD because dividing ANY odd number would leave a remainder of 1.

Sample Code:

var1 = raw_input("Please enter a whole number:")

leftover = int(var1) % 2

if leftover == 0:

- print var1, "is an even number"

else:

- print var1, "is an odd number

"

Get in Touch With Us!

* Subscribe and get Coding 101 automatically at TWiT.tv!
* Follow PadreSJ and Snubs on Twitter.
* Watch the show live and join the chatroom every Thursday at 1:30pm PST.
* Email us at Padre@twit.tv and Shannon@twit.tv.
* Join our Google+ Community!

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

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Running time: 43:00