Re: at what complexity, a comparison fails ?
- From: Steven D'Aprano <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 31 Dec 2007 13:52:28 -0000
On Mon, 31 Dec 2007 11:45:55 +0100, Stef Mientki wrote:
hello,
I had a program that worked perfectly well. In this program modules were
dynamically added, just by putting the file in a predefined directory.
Now one of the interface mechanisms was to see if some parameter was
changed in a an instance,
by comparing the value from the instance with its previous value
This went all well, untill I added a too complex variable, then the
program stopped working, without generating exceptions.
What do you mean "stopped working"?
So it seems that comparing a too complex value isn't allowed. the
variable was something like:
A = [ <ndarray>, <ndarray>, ..., [<color>,<color>,...], [<float>,
<float>, ... ] ]
Doesn't seem complex to me, and I daresay probably not to Python either
-- although a lot depends on what "ndarray" and "colour" are.
So what I need was something like:
if A != A_prev :
... do something
A_prev = A
And this crashes, or at least it doesn't work but also doesn't generate
exceptions.
It "crashes"? Explain please.
It does seems to work, if A only contains 1 array.
Why am I not allowed to compare A and A_prev ?? And in general, how
complex might a list be to make a valid comparison, or what are the
rules ?
As complicated as you like.
--
Steven
.
- References:
- at what complexity, a comparison fails ?
- From: Stef Mientki
- at what complexity, a comparison fails ?
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