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POHow can I append these entries to the list?
 

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  1. POHow can I append these entries to the list?
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    <p>I have written a pair of methods in python:</p> <ol> <li><code>number_combinations()</code> which obtains all possible combinations of 3 numbers</li> <li><code>checkAllValuesAreDifferent()</code> which checks that all the values in the list are different</li> </ol> <p>-</p> <pre><code>temp = [] def number_combinations(listOfElements,index): if index==3: #if checkAllValuesAreDifferent(listOfElements): #print "Going to append the following list to the sat tuple list " print listOfElements #print "Temp is ",temp temp.append(listOfElements) print "Temp is ",temp print "exit from function " return listOfElements else: for value in range(3): listOfElements[index]=value #print "LIST OF ELEMENTS IS ",listOfElements if checkAllValuesAreDifferent(listOfElements,index,value)==True: #print "RECURSIVE CALL " (number_combinations(listOfElements,index+1)) #print "THE LIST IS ",temp #print "APPENDING TO SAT TUPLES " #print "BACKTRACK HAPPEND ",listOfElements #print "AND INDEX IS ",index #recursive call to next level return #backtrack since no number found def checkAllValuesAreDifferent(list_of,index,value): if index==0: return True else: for i in range(index): #print "Entered loop with index ",index if(list_of[i]==value): return False return True </code></pre> <p>When I just try printing the listOfElements, I get the right answer i.e all sets of 3 digits with each distinct. However, when I try appending to the list temp, I end up getting duplicate entries. So temp should be : <code>[0,1,2],[0,2,1][1,0,2][1,2,0][2,0,1][2,1,0]</code> (which is the result of printing alone).However,temp turns out to be <code>[[2, 2, 2], [2, 2, 2], [2, 2, 2], [2, 2, 2], [2, 2, 2], [2, 2, 2]]</code></p> <p>I cannot figure out the problem with this. Could anyone give me some idea as to how to successfully append the right lists being generated to the temp list.</p>
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    1. USAnurag Chaudhury
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    1. CO[... Seriously?](http://docs.python.org/library/itertools.html#itertools.permutations)
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      1. POHow can I append these entries to the list?
      1. USIgnacio Vazquez-Abrams
    2. CO@IgnacioVazquez-Abrams -- using that method would be preferable, yeah, since it exists in the stdlib, but writing one by yourself is good exercise. There's also a very valuable lesson to be learned about mutable and immutable types in Python here.
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