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pythoncython
Jonny
Jonny

Reputation: 1368

Can I compile with Cython through a normal Python script?

Cython can sometimes remarkably decrease computational time by converting the code and running it in C. Is there a way to use Cython through a normal script by using some import-- function?

I downloaded Python (x y) and am not even sure what the 'best' way is to use Python. iPython notebook or Spyder etc ... ?

What are my other options?

Upvotes: 3

Views: 1542

Answers (1)

Padraic Cunningham
Padraic Cunningham

Reputation: 180391

You can write your cython code in your .pyx file.

Then use pyximport to compile it by adding something like:

  `import pyximport;     
   pyximport.install()` 
   from foo import foo # finds foo.pyx automatically

It detects changes in a cython file and recompiles if necessary or else loads the cached module.

A simple example running from ipython in the same directory as my fib.pyx:

My fib.pyx looks like:

def cython_fib(int n):
    cdef long i,a, b
    a,b = 0,1
    for i in xrange(n):
         a,b = b,a + b
    return a

Then I import pyximport etc..

In [1]: import pyximport 

In [2]: pyximport.install()
Out[2]: (None, <pyximport.pyximport.PyxImporter at 0x7f0139916e10>)

In [3]: from fib import cython_fib # import like a normal python import

In [4]: cython_fib(20)
Out[4]: 6765

Upvotes: 4

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