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    <p>For a one-file project like yours, another alternative is to use <code>pyximport</code>. You don't need to create a <code>setup.py</code> ... you don't need to even open a command line if you use IPython ... it's all very convenient. In your case, try running these commands in IPython or in a normal Python script:</p> <pre><code>import numpy import pyximport pyximport.install(setup_args={"script_args":["--compiler=mingw32"], "include_dirs":numpy.get_include()}, reload_support=True) import my_pyx_module print my_pyx_module.some_function(...) ... </code></pre> <p>You may need to edit the compiler of course. This makes import and reload work the same for <code>.pyx</code> files as they work for <code>.py</code> files.</p> <p>Source: <a href="http://wiki.cython.org/InstallingOnWindows" rel="noreferrer">http://wiki.cython.org/InstallingOnWindows</a></p>
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    1. POCython: "fatal error: numpy/arrayobject.h: No such file or directory"
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    1. USSteve Byrnes
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    1. COThanks, @SteveB. But can you elaborate a bit on what you mean by "_For a one-file project like yours_..."? The module above is one (albeit important) part of a larger application. How does `pyximport` affect my code's speed? And finally, the section here: ["_Since Cython 0.11, the pyximport module also has experimental compilation support for normal Python modules_..."](http://docs.cython.org/src/userguide/tutorial.html#pyximport-cython-compilation-the-easy-way) implies that it still has some kinks to work out. Can you explain that as well?
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    2. CORe "experimental compilation support for normal Python modules" -- with the code I suggested above, `.py` modules are compiled normally (not with cython) while `.pyx` modules are compiled with cython. If you pass `pyimport = True` into `pyximport.install()`, then it will use cython for everything, even for example `import random` or `import os`. I don't suggest using that feature, simply because there's no compelling reason to use it, and it could create problems. It's probably used mainly by cython developers.
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    3. COIf `pyximport` works at all, it will create the exact same C code as any other method. So try it and see. I was referring to the fact that when the compilation process is sufficiently complicated, e.g. links to external system libraries, you might find that pyximport fails and you need a `setup.py` and `cythonize` to specify exactly how to build it. But the fact that your `.pyx` module has `import`s or `cimport`s does not mean that it can't be compiled with `pyximport`; it may well be totally fine.
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