title: Python Scikit Learn: 'argument 1 must be a unicode character, not a list
body: <p>I am using the following array of tuples which I am storing as a temporary variable <code>new_make_moons</code> to test what happens when I change the make_moons dataset. Can someone tell me why I am getting the error? I have set the first argument as <code>str('u')</code> because that's what I found in another solution.</p>
  <pre><code>new_make_moons = (array([[  1.99794539e+00,   4.35929780e-01],
         [  5.95216657e-01,  -4.14412623e-01],
         [  1.46253829e+00,  -3.86599306e-01],
         [  1.61911895e-01,  -4.55349012e-02],
         [  7.77479066e-01,  -4.74927912e-01],
         [  1.96729486e+00,   2.46345416e-01],
         [  2.84527587e-01,   9.58667853e-01],
         [ -4.04783343e-01,   9.14412623e-01],
         [  1.98586378e-01,  -9.81105305e-02],
         [  9.97945393e-01,   6.40702200e-02],
         [ -7.18349350e-01,   6.95682551e-01],
         [  1.28452759e+00,  -4.58667853e-01],
         [  2.81650650e-01,  -1.95682551e-01],
         [  3.45365054e-01,   9.38468422e-01],
         [ -9.81559157e-01,   1.91158629e-01],
         [ -2.22520934e-01,   9.74927912e-01],
         [  1.67230089e+00,  -2.40277997e-01],
         [  1.59599895e-01,   9.87181783e-01],
         [  9.03976974e-01,  -4.95379113e-01]]), array(str(&quot;u&quot;), [1, 1, 1, 0, 0, 1, 1, 0, 0, 1, 1, 0, 1, 1, 0, 1, 0, 1, 1, 0, 0, 0, 0,
         0, 1, 1, 0, 1, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 1, 0, 1,
         1, 0, 1, 0, 1, 1, 0, 1, 0, 0, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 1,
         1, 0, 1, 1, 1, 0, 0, 1, 1, 1, 0, 0, 0, 0, 1, 1, 1, 1, 0, 0, 1, 0, 0,
         1, 1, 0, 0, 0, 1, 0, 1]))
  </code></pre>