[Tutor] understanding Functions help

[keith papa]

Hi my name is keith and am new to python programming, Am learning python for the first time with the help of coursera problem is am starting a new topic call functions in python and am totally lost. can you please help me understand how function work? why it use in python, what are the rules of function etc.

this some of the code the teacher used as an example.
 http://www.codeskulptor.org/#examples-functions.py

this is the video explaing functions: 
https://onedrive.live.com/redir?resid=B91E3E58ABADC574%21863
 		 	   		  
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