Cython in Ipython: ERROR: Cell magic `%%cython` not found
<p>While using <code>cython</code> in ipython notebook, I see the error below. What's wrong?</p>

<pre><code>%load_ext cythonmagic
/usr/local/lib/python2.7/dist-packages/IPython/extensions/cythonmagic.py:21: UserWarning: The Cython magic has been moved to the Cython package
      warnings.warn("""The Cython magic has been moved to the Cython package""")



%%cython
def fib(int n):
    cdef int a,b,i
    for i in range(n):
        a,b=a+b,b
    return a 

ERROR: Cell magic `%%cython` not found.
</code></pre>