title: Running Cython in Jupyter iPython
body: <p>Running an iterative loop for a geometric progression for a time trial, using the Cython interface. </p>
  
  <p>Get an error on compile (shift-enter): CompileError: command 'gcc' failed with exit status 1</p>
  
  <pre><code>%load_ext Cython
  </code></pre>
  
  <blockquote>
    <p></p>
  </blockquote>
  
  <pre><code>%%cython
  def geo_prog_cython(double alpha, int n):
      cdef double current = 1.0
      cdef double sum = current
      cdef int i
      for i in range(n):
          current = current * alpha
          sum = sum + current
      return sum
  </code></pre>
  
  <p>The error:</p>
  
  <pre><code>//anaconda/lib/python3.5/distutils/command/build_ext.py in build_extension(self, ext)
      530                                          debug=self.debug,
      531                                          extra_postargs=extra_args,
  --&gt; 532                                          depends=ext.depends)
      533 
      534         # XXX outdated variable, kept here in case third-part code
  </code></pre>