Beginning Python - From Novice to Professional

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CHAPTER 17 ■ EXTENDING PYTHON 363 for (i=0; i
364 CHAPTER 17 ■ EXTENDING PYTHON The only one needed is the -python option, to make sure SWIG wraps your C code so you can use it in Python. Another option you may find useful is -c++, which you use if you’re wrapping a C++ library. You run SWIG with the interface file (or, if you prefer, a header file) like this: $ swig -python palindrome.i After this, you should have two new files—one called palindrome_wrap.c and one called palindrome.py. Compiling, Linking, and Using This is, perhaps, the most tricky part (at least I think so). In order to compile things properly, you need to know where you keep the source code of your Python distribution (or, at least, the header files called pyconfig.h and Python.h; you will probably find these in the root directory of your Python installation, and in the Include subdirectory, respectively). You also have to figure out the right switches to compile your code into a shared library with your C compiler of choice. Here is an example for Solaris using the cc compiler, assuming that $PYTHON_HOME points to the root of Python installation: $ cc -c palindrome.c $ cc -I$PYTHON_HOME -I$PYTHON_HOME/Include -c palindrome_wrap.c $ cc -G palindrome.o palindrome_wrap.o -o _palindrome.so Here is the sequence for using the gcc compiler in Linux: gcc -c palindrome.c gcc -I$PYTHON_HOME -I$PYTHON_HOME/Include -c palindrome_wrap.c gcc -shared palindrome.o palindrome_wrap.o -o _palindrome.so It may be that all the necessary include files are found in one place, such as /usr/include/ python2.4 (update the version number as needed). In this case, the following should do the trick: gcc -c palindrome.c gcc -I/usr/include/python2.4 -c palindrome_wrap.c gcc -shared palindrome.o palindrome_wrap.o -o _palindrome.so In Windows (again assuming that you’re using gcc on the command line) you could use the following command as the last one, for creating the shared library: gcc -shared palindrome.o palindrome_wrap.o C:/Python24/libs/libpython24.a -o _palindrome.dll ■Note If you use gcc on Solaris, add the flag -fPIC to the first two command lines (right after the command gcc). Otherwise, the compiler will become mighty confused when you try to link the files in the last command. Also, if you’re using using a package manager (as is common in many Linux platforms), you may have to install a separate package (called something like python-dev) to get the header files needed to compile your extensions.
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Beginning Python From Novice to Pro
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For Ranveig
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■CHAPTER 23 Project 4: In the New
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viii ■CONTENTS Strings . . . . .
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About the Technical Reviewer ■JER
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Introduction A C program is like a
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CHAPTER 9 ■ MAGIC METHODS, PROPER
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256 CHAPTER 11 ■ FILES AND STUFF
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298 CHAPTER 14 ■ NETWORK PROGRAMM
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Index ■Symbols - operator 558 !=
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