What documentation "standard" to use

[Kalle Anke]

I'm confused of how I should document my code, I've always liked being able 
to document my code directly in my source file and then to use some tool to 
extract the documentation to some other format.

My problem with Python is that there are so many tools and formats ... I 
don't know which one I should use. I've tried to figure out if there is one 
that is the "de-facto standard" but ...

Could someone advice me on what format/tool I should use?