Article of interest: Python pros/cons for the enterprise

Paul Rubin http
Fri Feb 22 19:43:57 CET 2008


Nicola Musatti <nicola.musatti at gmail.com> writes:
> >    a = [f(x) + g(y) for x,y in izip(m1, m2) if h(x,y).frob() == 7]
> >
> > Consider how many intermediate objects are being allocated in figuring
> > out that listcomp.  Do you REALLY want to manage all the deallocation
> > with something like RAII?
> 
> What makes you think that a translation of a similar expression would
> involve explicit dynamic allocation at all? Barring bugs, here's an
> equivalent example: ...

There you replace one line of code with 40+ lines to get around the
absence of GC.  Sounds bug-prone among other things.

> int f(int n) { return n * 2; }
> int g(int n) { return ( n * 2 ) + 1; }

That is not a reasonable translation, since you've assumed the output
of f and g are integers that don't need to be dynamically allocated.
Maybe in the Python example, f and g and x and y are all bignums or
matrices or something like that.



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