On 04/01/2014 05:44, Steven D'Aprano wrote:
On Fri, Jan 03, 2014 at 01:53:42PM -0500, Keith Winston wrote:
That's what I meant to do: make a copy when I wrote chute_nums = chutes. So
I should have passed chute_nums to summarize_game, but it still wouldn't
work (because it's not a copy).
Python never makes a copy of objects when you pass them to a function or
assign them to a name. If you want a copy, you have to copy them
yourself:
import copy
acopy = copy.copy(something)
ought to work for just about anything. (Python reserves the right to not
actually make a copy in cases where it actually doesn't matter.)
There are a couple of shortcuts for this:
# copy a dictionary
new = old.copy()
# copy a list, or tuple
new = old[:] # make a slice from the start to the end
Please be aware of the difference between deep and shallow copies see
http://docs.python.org/3/library/copy.html
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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