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POelements being copied along a list in python
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  1. POelements being copied along a list in python
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    copied!<p>I have a list of lists called <code>hab</code> acting as a 2D array. In this list of lists I am storing elements of a class called <code>loc</code> which is why I am not using a numpy array (it's not storing numbers). </p> <p>I want to fill each element with a randomly picked 'loc' by looping through each element. However it seems that whenever I get to the end of a row, the program takes the final row element and puts it in all the other elements in that row. This means that I end up with the list of lists looking like this:</p> <pre><code>3 3 3 3 3 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 4 4 4 4 4 </code></pre> <p>when actually I want all these numbers to be random (this is printing out a specific trait of each <code>loc</code> which is why it is numbers). </p> <p>Here is the relevant bit of code:</p> <pre><code>allspec=[] # a list of species for i in range(0,initialspec): allspec.append(species(i)) # make a new species with new index print 'index is',allspec[i].ind, 'pref is', allspec[i].pref hab=[[0]*xaxis]*yaxis respect = randint(0,len(allspec)-1) for j in range(0,yaxis): for k in range (0,xaxis): respect=randint(0,len(allspec)-1) print 'new species added at ',k,j,' is ', allspec[respect].ind hab[k][j]=loc(k,j,random.random(),allspec[respect]) print 'to confirm, this is ', hab[k][j].spec.ind for k in range (0,xaxis): print hab[k][j].spec.ind printgrid(hab,xaxis,yaxis) print 'element at 1,1', hab[1][1].spec.ind </code></pre> <p>Within the loop, I am confirming that the element I have created is what I want it to be with the line <code>print 'to confirm, this is ', hab[k][j].spec.ind</code> and it is fine at this point. It is only when that loop is exited that it somehow fills every element on the row with the same thing. I don't understand!</p>
 

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