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POImport constants from .h file into python
 

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    <p>I've been looking for a simple answer to this question, but it seems that I can't find one. I would prefer to stay away from any external libraries that aren't already included in Python 2.6/2.7.</p> <p>I have 2 c header files that resemble the following:</p> <pre class="lang-c prettyprint-override"><code>//constants_a.h const double constant1 = 2.25; const double constant2 = -0.173; const int constant3 = 13; </code></pre> <p>...</p> <pre class="lang-c prettyprint-override"><code>//constants_b.h const double constant1 = 123.25; const double constant2 = -0.12373; const int constant3 = 14; </code></pre> <p>...</p> <p>And I have a python class that I want to import these constants into:</p> <pre class="lang-py prettyprint-override"><code>#pythonclass.py class MyObject(object): def __init(self, mode): if mode is "a": # import from constants_a.h, like: # self.constant1 = constant1 # self.constant2 = constant2 elif mode is "b": # import from constants_b.h, like: # self.constant1 = constant1 # self.constant2 = constant2 </code></pre> <p>...</p> <p>I have c code which uses the constants as well, and resembles this: </p> <pre><code>//computations.c #include &lt;stdio.h&gt; #include &lt;math.h&gt; #include "constants_a.h" // do some calculations, blah blah blah </code></pre> <p>How can I import the constants from the header file into the Python class?</p> <p>The reason for the header files constants_a.h and constants_b.h is that I am using python to do most of the calculations using the constants, but at one point I need to use C to do more optimized calculations. At this point I am using ctypes to wrap the c code into Python. I want to keep the constants away from the code just in case I need to update or change them, and make my code much cleaner as well. I don't know if it helps to note I am also using NumPy, but other than that, no other non-standard Python extensions. I am also open to any suggestions regarding the design or architecture of this program.</p>
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    1. COSorry for such late feedback everyone. I had a new, urgent project that I was working on, and had to put this on the backburner. As of the moment, I am stuck between Cong's and Emilio's answers. I will probably lean more towards the Cong's ctypes implementation, but I still really like the parsing method using `re`. Thanks for the great ideas everyone!
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