Python C extension: Use extension PYD or DLL?

Question

I have a Python extension written in C and I wonder if I should use the file extension DLL or PYD under Windows. (And what would I use in Linux?)

Are there any diffe

Answer 1

In Windows you can use *.pyd to be imported directly from Python import foo but for *.dll you should use this:

from ctypes import cdll
#load dll file , the file in the same .py file location or enter the full path
mylib=cdll.LoadLibrary("foo.dll") 
#call a function from this dll (c-ext) 
ReturnedValue=mylib.FunctionName()

If you want to explore what functions are exported in this Dll use this tool

UPDATE: Here's an example using distutils and SWIG to build the extension. Check this article out, it shows many simple examples under Windows and Linux.