How do I convert a Python list into a C array by using ctypes?
This is an explanation of the accepted answer.
ctypes.c_int * len(pyarr) creates an array (sequence) of type c_int of length 4 (python3, python 2). Since c_int is an object whose constructor takes one argument, (ctypes.c_int * len(pyarr)(*pyarr) does a one shot init of each c_int instance from pyarr. An easier to read form is:
pyarr = [1, 2, 3, 4]seq = ctypes.c_int * len(pyarr)arr = seq(*pyarr)Use type function to see the difference between seq and arr.