In [1]:

    

%load_ext cython


    

In [2]:

    

import sys
import Cython
#print("Python %d.%d.%d %s %s" % sys.version_info)
#print("Cython %s" % Cython.__version__)


    

In [ ]:

    

# simple setup without elaborate dependencies
from distutils.core import setup
from Cython.Build import cythonize

setup(
    ext_modules = cythonize("*.pyx"),  # <- glob pattern
)


    

In [ ]:

    

# more complex case with per-module configuration
from distutils.core import setup
from Cython.Build import cythonize
from distutils.extension import Extension

ext_modules = [
    Extension(
        ["mypackage/mymodule.pyx"],
        ...  # configure C build + libraries here
    )]

setup(ext_modules = cythonize(ext_modules))


    

In [3]:

    

%%cython

def pyfunc(x):
    return x + 1

def cyfunc(int x):
    return x + 1

cdef int cfunc(int x):
    return x + 1

cpdef cypyfunc(int x):
    y = cfunc(x + 1)
    return y * 2


    

In [4]:

    

pyfunc(2)


    

    
Out[4]:





3

In [5]:

    

cyfunc(2)


    

    
Out[5]:





3

In [6]:

    

cfunc(2)


    

    




---------------------------------------------------------------------------
NameError                                 Traceback (most recent call last)
<ipython-input-6-aad7450ab81e> in <module>()
----> 1 cfunc(2)

NameError: name 'cfunc' is not defined

In [7]:

    

cypyfunc(2)


    

    
Out[7]:





8

In [8]:

    

import math

def sin(x):
    return math.sin(x)


    

In [9]:

    

%%cython -a
cimport libc.math

def sin(double x):
    return libc.math.sin(x)


    

    
Out[9]:









    
    
    
    


Generated by Cython 0.23.1

    Yellow lines hint at Python interaction.

    Click on a line that starts with a "+" to see the C code that Cython generated for it.

 1: cimport libc.math
 2: 
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In [10]:

    

%%cython
def local_variables(x):
    cdef int i = 5, ix = x
    print(i * ix)
    return (i + ix) // 2


    

In [11]:

    

local_variables(2)


    

    




10






    
Out[11]:





3

In [12]:

    

import math

def py_circular_distance(radius, lon1, lat1, lon2, lat2):
    x = math.pi/180.0
    a = (90.0-lat1) * x
    b = (90.0-lat2) * x
    theta = (lon2-lon1) * x
    c = math.acos((math.cos(a)*math.cos(b)) + (math.sin(a)*math.sin(b)*math.cos(theta)))
    return radius*c


    

In [13]:

    

%%cython -a
cimport libc.math as math

def cy_circular_distance(double radius, double lon1, double lat1, double lon2, double lat2):
    x = math.M_PI/180.0
    a = (90.0-lat1) * x
    b = (90.0-lat2) * x
    theta = (lon2-lon1) * x
    c = math.acos((math.cos(a)*math.cos(b)) + (math.sin(a)*math.sin(b)*math.cos(theta)))
    return radius*c


    

    
Out[13]:









    
    
    
    


Generated by Cython 0.23.1

    Yellow lines hint at Python interaction.

    Click on a line that starts with a "+" to see the C code that Cython generated for it.

 1: cimport libc.math as math
 2: 
+3: def cy_circular_distance(double radius, double lon1, double lat1, double lon2, double lat2):
/* Python wrapper */
static PyObject *__pyx_pw_46_cython_magic_1bb61b3ca631ffd4895e85b4ddcdf8b4_1cy_circular_distance(PyObject *__pyx_self, PyObject *__pyx_args, PyObject *__pyx_kwds); /*proto*/
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In [14]:

    

print(py_circular_distance(10, 1.2, 2, 2, 4.3))
print(cy_circular_distance(10, 1.2, 2, 2, 4.3))


    

    




0.424943087932
0.424943087932

In [15]:

    

%timeit py_circular_distance(10, 1.2, 2, 2, 4.3)


    

    




The slowest run took 8.66 times longer than the fastest. This could mean that an intermediate result is being cached 
1000000 loops, best of 3: 1.05 µs per loop

In [16]:

    

%timeit cy_circular_distance(10, 1.2, 2, 2, 4.3)


    

    




The slowest run took 14.79 times longer than the fastest. This could mean that an intermediate result is being cached 
1000000 loops, best of 3: 210 ns per loop

In [17]:

    

%%cython -a
# libc math functions
from libc cimport math

print( math.sin(math.M_PI / 2) )


    

    




1.0






    
Out[17]:









    
    
    
    


Generated by Cython 0.23.1

    Yellow lines hint at Python interaction.

    Click on a line that starts with a "+" to see the C code that Cython generated for it.

 1: # libc math functions
 2: from libc cimport math
 3: 
+4: print( math.sin(math.M_PI / 2) )
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In [18]:

    

%%cython
# dynamic C memory allocation
from libc.stdlib cimport malloc, free

cdef int* cmem = <int*>malloc(22 * sizeof(int))
if not cmem:
    raise MemoryError()
free(cmem)


    

In [19]:

    

%%cython
# dynamic CPython heap memory allocation
from cpython.mem cimport PyMem_Malloc, PyMem_Free

cdef int* pymem = <int*>PyMem_Malloc(22 * sizeof(int))
if not pymem:
    raise MemoryError()
    
try:
    pymem[:] = [1,2,3]
    print( pymem[0] + pymem[2] )
finally:
    PyMem_Free(pymem)


    

    




4

In [20]:

    

%%cython -a
from libc cimport math, stdlib
py_sin = math.sin
py_atoi = stdlib.atoi


    

    
Out[20]:









    
    
    
    


Generated by Cython 0.23.1

    Yellow lines hint at Python interaction.

    Click on a line that starts with a "+" to see the C code that Cython generated for it.

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py_sin(1/2)


    

    
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0.0

In [22]:

    

py_atoi(b'123')


    

    
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In [23]:

    

%%cython
# distutils: include_dirs=/usr/include/luajit-2.0
# distutils: libraries=luajit-5.1

## distutils: include_dirs=/usr/include/lua5.1
## distutils: libraries=lua5.1

cdef extern from "lua.h":
    ctypedef struct lua_State
    lua_State *luaL_newstate ()
    void lua_close (lua_State *L)
    int luaL_loadbuffer (lua_State *L, char *buff, size_t sz, char *name)
    void lua_settop (lua_State *L, int idx)
    int lua_gettop (lua_State *L)
    int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc)
    int lua_type (lua_State *L, int idx)
    float lua_tonumber (lua_State *L, int idx)
    enum:
        LUA_TNUMBER
        LUA_MULTRET


def run_lua(code):
    cdef int result_status
    cdef float result

    if isinstance(code, unicode):
        code = code.encode('utf8')
    elif not isinstance(code, bytes):
        raise ValueError("code must be a string")

    # init Lua runtime
    L = luaL_newstate()
    if not L:
        raise MemoryError()

    try:
        # compile Lua code
        if luaL_loadbuffer(L, code, len(code), '<python>'):
            raise SyntaxError()

        # execute code
        if lua_pcall(L, 0, LUA_MULTRET, 0):
            raise RuntimeError()

        # convert return value (Lua number == float)
        assert lua_type(L, 1) == LUA_TNUMBER, "not a numeric return value"
        return lua_tonumber(L, 1)
    finally:
        lua_settop(L, 0)
        lua_close(L)


    

    




---------------------------------------------------------------------------
CompileError                              Traceback (most recent call last)
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   2262             magic_arg_s = self.var_expand(line, stack_depth)
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-> 2264                 result = fn(magic_arg_s, cell)
   2265             return result
   2266 

/Users/markhoughton/anaconda/lib/python2.7/site-packages/Cython/Build/IpythonMagic.pyc in cython(self, line, cell)

/Users/markhoughton/anaconda/lib/python2.7/site-packages/IPython/core/magic.pyc in <lambda>(f, *a, **k)
    191     # but it's overkill for just that one bit of state.
    192     def magic_deco(arg):
--> 193         call = lambda f, *a, **k: f(*a, **k)
    194 
    195         if callable(arg):

/Users/markhoughton/anaconda/lib/python2.7/site-packages/Cython/Build/IpythonMagic.pyc in cython(self, line, cell)
    276             build_extension.build_temp = os.path.dirname(pyx_file)
    277             build_extension.build_lib  = lib_dir
--> 278             build_extension.run()
    279             self._code_cache[key] = module_name
    280 

/Users/markhoughton/anaconda/lib/python2.7/distutils/command/build_ext.pyc in run(self)
    335 
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--> 337         self.build_extensions()
    338 
    339     def check_extensions_list(self, extensions):

/Users/markhoughton/anaconda/lib/python2.7/distutils/command/build_ext.pyc in build_extensions(self)
    444 
    445         for ext in self.extensions:
--> 446             self.build_extension(ext)
    447 
    448     def build_extension(self, ext):

/Users/markhoughton/anaconda/lib/python2.7/distutils/command/build_ext.pyc in build_extension(self, ext)
    494                                          debug=self.debug,
    495                                          extra_postargs=extra_args,
--> 496                                          depends=ext.depends)
    497 
    498         # XXX -- this is a Vile HACK!

/Users/markhoughton/anaconda/lib/python2.7/distutils/ccompiler.pyc in compile(self, sources, output_dir, macros, include_dirs, debug, extra_preargs, extra_postargs, depends)
    572             except KeyError:
    573                 continue
--> 574             self._compile(obj, src, ext, cc_args, extra_postargs, pp_opts)
    575 
    576         # Return *all* object filenames, not just the ones we just built.

/Users/markhoughton/anaconda/lib/python2.7/distutils/unixccompiler.pyc in _compile(self, obj, src, ext, cc_args, extra_postargs, pp_opts)
    120                        extra_postargs)
    121         except DistutilsExecError, msg:
--> 122             raise CompileError, msg
    123 
    124     def create_static_lib(self, objects, output_libname,

CompileError: command 'gcc' failed with exit status 1

In [ ]:

    

code = '''
function fib(i)
    if i > 2 then
        return fib(i-1) + fib(i-2)
    else
        return 1
    end
end
'''

run_lua(code + "return fib(10)")


    

In [ ]:

    

%%timeit bench = code + "return fib(24)"

run_lua(bench)


    

In [ ]:

    

# distutils: include_dirs=/usr/include/luajit-2.0
# distutils: libraries=luajit-5.1


    

In [3]:

    

%%cython -a
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    b[5:] = [6,7,8,9,10]

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        print(i+1)

    return b


    

    
Out[3]:









    
    
    
    


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carrays()


    

    




2
3
4






    
Out[4]:





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In [6]:

    

ctuples()


    

    




42
8.4
(42, 8.4)






    
Out[6]:





(42, 8.4)

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%%cython -a
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from libcpp.vector cimport vector

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x = Integers()
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In [ ]: