Cython with numpy in ipython

cython_numpy.pyx

%%cython
import numpy as np
cimport numpy as np
from libc.math cimport sqrt
cimport cython

ctypedef double (*mertric_ptr)(np.ndarray, np.ndarray)

cdef double euclidean_distance( np.ndarray[double, ndim=1, mode='c'] x1):
    N = x1.shape[0]
    for i in range( N):
        print x1[i]
    
    return 0.0
        
def run():
    X = np.ones( 10, dtype='double')
    euclidean_distance( X)
    
run()