[Tutor] 'in-place' methods

[Alan Gauld]

>I think I understand this sorting-a-list 'in place' stuff, and things  
> of that kind (reversing for example); but I am finding it very  
> difficult to get used to, since sorting a list doesn't return the  
> sorted list as a value, but simply does the work as a side effect.

If its any consolation I personally think this ois one of the 
worst aspects of Python. Most of its features I either like 
or can tolerate but this one just seems insane to me.

> Third question: is this in-place behavior of methods in effect  
> restricted to lists, or are there other places I should be on the  
> lookout for it?

The other place where a None return seems unintuitive is in 
Tkinter. The layout manager methods(pack, grid etc) all return 
None when most folks intuitively expect them to return the widget.
But I think the reason for that is that the underlying Tk code does 
the same.

Alan G.