[Python-Dev] ANN: Pyrex - a language for writing Python extension
Thu, 04 Apr 2002 10:08:22 -0700
Greg Ewing wrote:
> Pyrex is more or less Python with C data types
> added. You can write functions which freely
> intermix operations on Python and C data, with
> all Python reference counting and error checking
> completely automated.
> An example Pyrex module is shown below. For more
> information, see:
Greg, this is beautiful. Exactly what I've been wanting.
1- Any chance of having "typecast" spelled as one of:
char*(value) #consistent w/ Python
(char *)value #consistent w/ C
cdef char*(value) #cdef + Python
(cdef char *)value #cdef + C
cdef(char*, value) #umm. Maybe easier for parsing?
I prefer any of the above over the <> syntax, in rough order of preference...
2- I like the use of the explicit extern declarations to "import" external C
items. It is analogous to "from X import NAME", rather than the "from X import
*" behavior suggested by parsing header files. Also, from previous experience
w/ SWIG, et al, I think parsing C (& especially C++!) headers is likely to
bring in more headaches than it is worth. How deeply do you want to get into
macros, typedefs, other extern declarations, etc.?
3- Any thoughts on accessing C++ classes? It need only include the info to
access the subset of members that are needed in Python/Pyrex... Maybe
cdef extern class Grail:
# all members implicity "cdef extern"
# To self or not to self?
# Let declarations be consistent w/ C++?
def __init__( int age, float volume )
def float quaff( float amount )
Wow! Look at those worms wiggle out of that can! ;-) (Next, I'll hit you up
for exceptions and default args, then overloading, then templates & RTTI... )