Cython in Ipython: ERROR: Cell magic `%%cython` not found

ipython cython

aman · Apr 9, 2016 · Viewed 14.2k times · Source

While using cython in ipython notebook, I see the error below. What's wrong?

%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.

Answer

What the warning is trying to communicate is that the extension defining the %%cython magic has moved to the Cython package, out of the IPython package. So instead of

%load_ext cythonmagic

you should do:

%load_ext Cython

After that, the cython magic should work as expected.

Cython in Ipython: ERROR: Cell magic `%%cython` not found

Answer

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