In [1]:

    

%load_ext cythonmagic
import numpy as np


    

In [8]:

    

%%cython
cimport numpy as np
def adding_one(np.ndarray[np.float64_t, ndim=1] ndarray):
    for i in xrange(len(ndarray)):
        ndarray[i] += 1


    

In [10]:

    

a = np.zeros(100000)
%timeit adding_one(a)


    

    




10000 loops, best of 3: 113 µs per loop

In [11]:

    

a = np.zeros(100000)
%timeit np.add(a, 1, out=a)


    

    




10000 loops, best of 3: 33.6 µs per loop

In [19]:

    

def appending(n):
    data = []
    for i in xrange(n):
        data.append(0)


    

In [20]:

    

%timeit appending(20)


    

    




100000 loops, best of 3: 2.37 µs per loop

In [21]:

    

%%cython 

def cy_appending(n):
    data = []
    for i in xrange(n):
        data.append(0)


    

In [22]:

    

%timeit cy_appending(20)


    

    




1000000 loops, best of 3: 843 ns per loop

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