Georg Brandl wrote: > which formatting code should be used for a Py_ssize_t value in e.g. > PyString_FromFormat? %zd > '%zd' won't work since my value can be negative, and the 'z' modifier > converts the argument to size_t. That's a bug. It should print it signed. If unsigned printing of size_t is desired, %zu should be used. Regards, Martin