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View Code? Open in Web Editor NEWJust a couple of (mostly instructive) programming exercises
Just a couple of (mostly instructive) programming exercises
@Blastoise firstly, read:
The basic idea is Python copies references. So, the way we initialize M
in our code is a big problem: because later we are going to modify it element by element.
Try this in the interactive shell:
>> M = [[0]*3]*4
>> M
>> M[1][2] = 99
>> M
Here, we try to update the third (index 2) element of only the second list copy (index 1) of list of lists M
. But since these copies are not true copies, we update third element of every copy, i,e. every list member of M
.
The answers above will help you fix this. Make sure your idea works for the above short example with M
first, before trying. Good luck! :)
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