Python 2到Python 3：我的矩阵出了问题

Question

我收到了这段代码：

predicted_labels = clf.predict(X_test)

def print_cm(cm, labels, hide_zeroes=False, hide_diagonal=False, hide_threshold=None):
    """pretty print for confusion matrixes"""
    columnwidth = max([len(x) for x in labels]+[5]) # 5 is value length
    empty_cell = " " * columnwidth
    # Print header
    print ("    " + empty_cell,)
    for label in labels:
        print ("%{0}s".format(columnwidth) % label,)
    print
    # Print rows
    for i, label1 in enumerate(labels):
        print ("    %{0}s".format(columnwidth) % label1,)
        for j in range(len(labels)):
            cell = "%{0}.1f".format(columnwidth) % cm[i, j]
            if hide_zeroes:
                cell = cell if float(cm[i, j]) != 0 else empty_cell
            if hide_diagonal:
                cell = cell if i != j else empty_cell
            if hide_threshold:
                cell = cell if cm[i, j] > hide_threshold else empty_cell
            print (cell,)
        print

conf = confusion_matrix(y_test, predicted_labels)
# then print it in a pretty way
print_cm(conf, flowpatterns_labels)

当我打印它时，我得到了一个矢量，而不是矩阵。它在python 2上工作正常，但在python 3上没有。任何想法？