Python Programming: Lesson 13 - Intro to Functions

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In the previous lesson (https://youtu.be/0fY2HIyM8Jk), we learned about the break and continue keywords, ways of either breaking out of a loop entirely or simply stopping the current iteration. Here, we introduce the concept of functions, as well as share a quick note about list(range(x)).

list(range(x)) = [0,1,2, ... , x-1]
list(range(x,y)) = [x,x+1,x+2, ... ,y-1]
list(range(x,y,z)) = [x,x+z, x+2*z, ... while less than y] if z is positive
list(range(x,y,z)) = [y,y-z, y-2*z, ... while greater than x] if z is negative

A function is a block of code that achieves a particular task. We can define a function and then call it afterwards. Some functions accept multiple inputs, and others just accept one or none at all.

def g( x , y , z ):
return x + y + 3*z - 100

print( g( 20 , 50 , 10 ) ) would print 0 on the console

0:49 NEW: list(range(x)), list(range(x,y)), list(range(x,y,z))
3:31 Review of break
5:13 Review of continue
8:04 Review of Optional else Architecture with break/continue
8:37 Another Example with both break and continue
10:37 NEW: Intro to Functions
11:48 NEW: Creating Functions
12:27 NEW: Calling Functions
13:27 NEW: Must Define Function before Calling It (unlike Java)
14:13 NEW: Arbitrary Data Types in Functions
17:06 NEW: Functions with Multiple Inputs and Functions that Return Values

A somewhat equivalent Java lesson regarding functions (called methods in Java) is available here: https://youtu.be/BEpd--kXIQI

Ready for more functions? Docstrings? Check it out: https://youtu.be/3xiToU24OO4 (lesson 14)

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