title: How do i fix this numpy.concatenate error?
body: <p>Imm trying to get an output like
  array([0,1,2,3,4,5]), but this error keeps popping up. When reading the python documentation for the numpy concatenate method, it claims axis=None will flatten the arrays first, so what am I not understanding?</p>
  <pre><code>&gt;&gt;&gt; a = np.array([1,2,3,4,5])
  &gt;&gt;&gt; b = np.array([0])
  &gt;&gt;&gt; b
  array([0])
  &gt;&gt;&gt; a
  array([1, 2, 3, 4, 5])
  &gt;&gt;&gt; np.concatenate(b,a,axis=None)
  Traceback (most recent call last):
    File &quot;&lt;stdin&gt;&quot;, line 1, in &lt;module&gt;
    File &quot;&lt;__array_function__ internals&gt;&quot;, line 4, in concatenate
  TypeError: concatenate() got multiple values for argument 'axis'
  &gt;&gt;&gt;
  </code></pre>