rahulgar...@gmail.com, 22.01.2013 18:20:
> Or can I just loop through the argument tuple manually by using something
> like PyTuple_GET_ITEM(args,i), then putting manual code to convert the
> objects to appropriate C type?
> The use case is that I am interfacing Python with another interpreter and do
> not know the type and number of arguments till runtime :)
Just in case you're not aware of it, C extensions are quite commonly
written in Cython instead of C these days. I've used it for Lupa, for
example, which embeds the Lua(JIT) runtime in CPython. That should be quite
similar to what you're after. It certainly makes things a lot easier to write
cdef class Wrapper:
"Wraps an external object for usage in Python."
cdef mylib.sometype* _wrapped_object # pointer to external 'thing'
def __call__(self, *args):
mapped_args = malloc(len(args)*...)
# ...
for i, arg in enumerate(args):
map_value_to_external(arg, mapped_args[i])
# ...
result = call_external(self._wrapped_object, mapped_args)
return map_value_from_external(result)
than to do these things in plain C. If nothing else, it saves you from
having to put thoughts into reference counting and other common CPython
C-API pitfalls.
Stefan
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