Cython: Difference between revisions

Revision as of 15:45, 22 October 2017

Revision as of 09:48, 29 October 2017

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== Using in Jupyter notebook ==

A more straightforward way to start with Cython is through command-line [[IPython]] (or through in-browser python console called Jupyter [[notebook interface|notebook]] (or through command-line [[IPython]]):

<source lang="Python">

In [1]: %load_ext Cython

def f(n):

In [2]: %%cython

a = 0

for i in range cpdef g(int n):

cdef int a += 0, i

for i in range(n):

return a

a += i

return a

a = 0

def f(n):

cdef int a = 0, i

for i in range(n):

a += i

return a

In [3]: %timeit f(1000000)

42.7 ms ± 783 µs per loop (mean ± std. dev. of 7 runs, 10 loops each)

In [4]: %timeit g(1000000)

74 µs ± 16.6 ns per loop (mean ± std. dev. of 7 runs, 10000 loops each)

%load_ext Cython

%%cython

cpdef g(int n):

cdef int a = 0, i

for i in range(n):

a += i

return a

%timeit f(1000000)

10 loops, best of 3: 82.4 ms per loop

%timeit g(1000000)

1000 loops, best of 3: 314 µs per loop

</source>

which gives a 262585 times improvement over the pure-python version. More details on the subject in the official quickstart page.<ref>{{Cite web|url=http://cython.readthedocs.io/en/latest/src/quickstart/build.html|title=Building Cython code|website=cython.readthedocs.io|access-date=2017-04-24}}</ref>

== Uses ==