import ctypes 

malib = ctypes.CDLL("./target/release/libpy.so") 

class Bidule(ctypes.Structure): 
	_fields_ = [ 
		("i", ctypes.c_int) 
	] 

fct_afficher = malib.afficher 
fct_afficher.argtypes = [ 
	ctypes.c_char_p, 
	ctypes.POINTER( Bidule ) 
] 
fct_afficher.restype = ctypes.c_int; 

b = Bidule( i = 42 ) 

r = fct_afficher( 
	"bonjour - éèà".encode( "utf-8" ), 
	b 
) 

print("le retour est :", r) 
print("Bidule.i =", b.i)