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POPython Matrix: Value not in list error
 

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    <p>I am writing a Python program that creates a 9x9 matrix with all of the values being 0. Then I have to manually put in the a actual values I want to be in it. (That is why I have all of the inserts.) I am trying to use the list.remove(x) command with list being the matrix and x being the value I am trying to remove. I know that the x value I am putting in is in the matrix but I keep getting an error saying it isn't.</p> <p>Here is my code:</p> <pre><code>matrix = [[0 for x in range (9)] for y in range (9)] C = matrix.count([0, 0, 0, 0, 0, 0, 0, 0, 0]) matrix.insert(0, [0, 0, 0, 5, 0, 0, 0, 0, 6]) matrix.insert(0, [8, 0, 0, 0, 4, 7, 5, 0, 3]) matrix.insert(0, [0, 5, 0, 0, 0, 3, 0, 0, 0]) matrix.insert(0, [0, 7, 0, 8, 0, 0, 0, 0, 9]) matrix.insert(0, [0, 0, 0, 0, 1, 0, 0, 0, 0]) matrix.insert(0, [9, 0, 0, 0, 0, 4, 0, 2, 0]) matrix.insert(0, [0, 0, 0, 9, 0, 0, 0, 1, 0]) matrix.insert(0, [7, 0, 8, 3, 2, 0, 0, 0, 5]) matrix.insert(0, [3, 0, 0, 0, 0, 8, 0, 0, 0]) matrix.reverse() for sublist in matrix: s = str(sublist) print (s) print (C) matrix.remove("[0, 0, 0, 0, 0, 0, 0, 0, 0]") </code></pre> <p>Here is the error I keep getting:</p> <pre><code>Traceback (most recent call last): line 17, in &lt;module&gt; matrix.remove("[0, 0, 0, 0, 0, 0, 0, 0, 0]") ValueError: list.remove(x): x not in list </code></pre> <p>I also tried using this code but Python seems to just find that it isn't in the matrix anyways. This I put in place of matrix.remove("[0, 0, 0, 0, 0, 0, 0, 0, 0]") Here it is:</p> <pre><code>if "[0, 0, 0, 0, 0, 0, 0, 0, 0]" in matrix: matrix.remove("[0, 0, 0, 0, 0, 0, 0, 0, 0]") </code></pre> <p>I am very new to Python and am still learning. Any help you might give me would be greatly appreciated. </p>
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    1. COFor numerical operations with matrices consider using [numpy](http://numpy.scipy.org/).
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