On Tue, Nov 15, 2011 at 1:08 PM, Maciej Fijalkowski <fij...@gmail.com>wrote:
> On Tue, Nov 15, 2011 at 8:03 PM, Alex Gaynor <alex.gay...@gmail.com> > wrote: > > > > > > On Tue, Nov 15, 2011 at 12:56 PM, Blaine <frik...@gmail.com> wrote: > >> > >> Hi everyone. I have a cellular automata framework in C++ and I use > cython > >> and cpython to run it. I found out that if I port it to pure python and > run > >> it with pypy, it's close to the same performance as the C++ version. > (about > >> 2x as slow, compared to 20x as slow when using pure python + cpython). > When > >> I throw in other overheads with pure python libraries, using the pure > python > >> and pypy is much faster than cpython with the C++ library, all things > equal. > >> What I'd like to do is detect if pypy or cpython is doing the importing > of > >> my module, and switch over to the pure python interface if pypy is > found. As > >> it stands I have to do it manually in my module's __init__.py. > >> Is there any way to detect if my module is being imported by pypy vs > >> cpython? Either via sys, or maybe some latent variable that is present, > or > >> something else. sys.argv[0] only has the script name (obviously), not > the > >> interpreter call. > >> Keep up the outstanding work. Pypy is great! > >> Thanks! > >> Blaine > >> > >> _______________________________________________ > >> pypy-dev mailing list > >> pypy-dev@python.org > >> http://mail.python.org/mailman/listinfo/pypy-dev > >> > > > > The canonical way is probably `import platform; > > platform.python_implementation()` which will return either "PyPy" or > > "CPython". > > Alex > > If you need to support older pythons (which don't have > platform.python_implementation), we use > > import sys > is_pypy = '__pypy__' in sys.builtin_module_names > > or alternatively: > > try: > import __pypy__ > except ImportError: > __pypy__ = None > > > > > -- > > "I disapprove of what you say, but I will defend to the death your right > to > > say it." -- Evelyn Beatrice Hall (summarizing Voltaire) > > "The people's good is the highest law." -- Cicero > > > > > > _______________________________________________ > > pypy-dev mailing list > > pypy-dev@python.org > > http://mail.python.org/mailman/listinfo/pypy-dev > > > > > And don't forget `hasattr(sys, "pypy_translation_info")` just for completeness, platform is the cleanest IMO though :) Alex -- "I disapprove of what you say, but I will defend to the death your right to say it." -- Evelyn Beatrice Hall (summarizing Voltaire) "The people's good is the highest law." -- Cicero
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