You might want to point out that "val" did not need to be declared, and might discuss weak versus strong typing.

Also, I believe there is a strong preference for indentations to consist of 4 spaces; and that tabs should be avoided, since different editors may expand them to different tab-stops.

Statements may follow the colon on the same line, so formatting can still vary. Python just gets rid of brace quibbling in this context.
I might also be worth footnoting that python's caring about whitespace introduces some (slight) inconveniences in the UNIX and HTML worlds, where whitespace has traditionally not been a syntactic element. For example a number of times I've seen web pages where someone has just pasted the source of a python program and all the indentation is lost. One must retreat to the HTML source to recover it.