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.
I have 2 c header files that resemble the following:
//constants_a.h
const double constant1 = 2.25;
const double constant2 = -0.173;
const int constant3 = 13;
...
//constants_b.h
const double constant1 = 123.25;
const double constant2 = -0.12373;
const int constant3 = 14;
...
And I have a python class that I want to import these constants into:
#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
...
I have c code which uses the constants as well, and resembles this:
//computations.c
#include <stdio.h>
#include <math.h>
#include "constants_a.h"
// do some calculations, blah blah blah
How can I import the constants from the header file into the Python class?
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.
I recommend using regular expressions (re module) to parse the information you want out of the files.
Building a full C parser would be huge, but if you only use the variables and the file is reasonably simple/predictable/under control, then what you need to write is straightforward.
Just watch out for 'gotcha' artifacts such as commented-out code!