00:02 9.0 Functions
00:22 9.1 Objective of Functions.
05:00 9.2 Function Syntax.
07:42 9.3 Input Arguments:
08:20 9.3.1 Positional and Keyword Input Arguments.
10:29 9.3.2 Default Input Arguments.
11:56 9.3.3 Arbitrary Positional Input Argument.
14:52 9.3.4 Arbitrary Keyword Input Argument.
17:03 9.4 Return Values:
17:57 9.4.1 Return Multiple Values.
20:16 9.4.2 Return Multiple Values as a Single Object.
22:22 9.4.3 Return a Value Based on a Conditional Statement.
23:41 9.4.4 Function With No Return.
24:17 9.5 General Function Syntax.
25:43 9.6 The “None” Data Type.
32:25 9.7 Python Scope
38:21 9.8 Inner Functions.
40:37 9.9 Interference With Python Built-in Functions