title: Error message "Cannot convert <type_name>* to Python object" in Cython
body: <p>When I cythonize the following Cython-module</p>
  
  <pre><code>%%cython
  cdef double *ptr=[1,2,3]
  print(ptr)
  </code></pre>
  
  <p>I get the following error message:</p>
  
  <blockquote>
    <p>Cannot convert 'double *' to Python object</p>
  </blockquote>
  
  <p>However, the following Cython module:</p>
  
  <pre><code>%%cython
  cdef double val=0.0
  print(val)
  </code></pre>
  
  <p>is cythonized without problems.</p>
  
  <p>This problem occurs also for any other pointer type (i.e. <code>int *</code>, <code>float *</code> and so on). </p>