Pass data from Python to C++
I have some c++ binaries that do rather intense number computations. They do it well and rather quickly compared to other languages (not just Python). An example: [EMAIL PROTECTED]:~/$ date ./compute.cpp.o 1_million.txt /dev/null date Thu May 15 13:08:28 EDT 2008 Thu May 15 13:08:31 EDT 2008 [EMAIL PROTECTED]:~/$ date python compute.py 1_million.txt /dev/null date Thu May 15 13:08:38 EDT 2008 Thu May 15 13:14:50 EDT 2008 In this case, c++ does one million things in 3 seconds that Python takes more than 6 minutes to do. The one million is a minimum. At times the computations are in the billions. This is why c++ was chosen. However, other components can be written in a more user friendly, more easily maintained language. We've chosen Python for this. The main question now is how to pass the computationally heavy info to c++ from within Pyhton. os.system is not ideal. Just wondering how other folks do this? I have source to some of the c++ code, but some of it is in binary from only. It can take stdin or arguments. Thanks for any tips, Brad -- http://mail.python.org/mailman/listinfo/python-list
Re: Pass data from Python to C++
brad wrote: I have some c++ binaries that do rather intense number computations. They do it well and rather quickly compared to other languages (not just Python). An example: [EMAIL PROTECTED]:~/$ date ./compute.cpp.o 1_million.txt /dev/null date Thu May 15 13:08:28 EDT 2008 Thu May 15 13:08:31 EDT 2008 [EMAIL PROTECTED]:~/$ date python compute.py 1_million.txt /dev/null date Thu May 15 13:08:38 EDT 2008 Thu May 15 13:14:50 EDT 2008 In this case, c++ does one million things in 3 seconds that Python takes more than 6 minutes to do. The one million is a minimum. At times the computations are in the billions. This is why c++ was chosen. However, other components can be written in a more user friendly, more easily maintained language. We've chosen Python for this. The main question now is how to pass the computationally heavy info to c++ from within Pyhton. os.system is not ideal. Just wondering how other folks do this? I have source to some of the c++ code, but some of it is in binary from only. It can take stdin or arguments. Thanks for any tips, Brad -- http://mail.python.org/mailman/listinfo/python-list There are lots of ways to do this.Lots of the modules you use are written in C and callable from Python. (Including sys, os, socket, PIL, numpy, all graphics and GUI modules, ...) And that's exactly what you want here -- a module that you can import into Python which gives you the ability to make calls into your C++ code. This is often called *wrapping* your C++ library. This is no small task, and it depends heavily on the size/complexity of the API you wish to wrap, and whether it's C (easier) or C++(harder). However, there are *lots* of tools to help. I'd start by looking here: http://wiki.python.org/moin/AdvocacyWritingTasks/GlueLanguage Good luck, Gary Herron -- http://mail.python.org/mailman/listinfo/python-list
Re: Pass data from Python to C++
In article [EMAIL PROTECTED], brad [EMAIL PROTECTED] wrote: I have some c++ binaries that do rather intense number computations. They do it well and rather quickly compared to other languages (not just Python). ... However, other components can be written in a more user friendly, more easily maintained language. We've chosen Python for this. The main question now is how to pass the computationally heavy info to c++ from within Pyhton. os.system is not ideal. Just wondering how other folks do this? I have source to some of the c++ code, but some of it is in binary from only. It can take stdin or arguments. You say you have binary only, but I hope you have the header files as well. If so I would try SWIG first since it is mature and handles C++ quite well. If you don't have headers then I have no idea if it's even possible. (For plain C I would start with ctypes, but that doesn't cover this case. There are many other options including boost and Pyrex, but I've not used those.) -- Russell -- http://mail.python.org/mailman/listinfo/python-list
Re: Pass data from Python to C++
brad schrieb: However, other components can be written in a more user friendly, more easily maintained language. We've chosen Python for this. The main question now is how to pass the computationally heavy info to c++ from within Pyhton. os.system is not ideal. Just wondering how other folks do this? I have source to some of the c++ code, but some of it is in binary from only. It can take stdin or arguments. You can either embed the C++ system as a shared library in Python or you can embed the Python interpreter in your C++ app. Either way you should use Python's buffer interface to access the data of your library. The buffer interfaces allows you to create a read only or read/write view on your data without copying the data. Christian -- http://mail.python.org/mailman/listinfo/python-list
