Deep vs. shallow copy?

Roy Smith roy at
Thu Mar 13 12:44:27 CET 2014

In article <5320e8c9$0$29994$c3e8da3$5496439d at>,
 Steven D'Aprano <steve+comp.lang.python at> wrote:

> Because Python doesn't have true procedures

What do you mean by "true procedure"?  Are you just talking about 
subroutines that don't return any value, i.e. fortran's SUBROUTINE vs. 

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