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It would be very practical use have a format, eg. '%y', to accept bytes object in PyBytes_FromFormatV().
Example (extracted from posixmodule.c):
 k = PyBytes_AsString(key2);
 v = PyBytes_AsString(val2);
 len = PyBytes_GET_SIZE(key2) + PyBytes_GET_SIZE(val2) + 2;
 p = PyMem_NEW(char, len);
 if (p == NULL) { PyErr_NoMemory(); ... }
 PyOS_snprintf(p, len, "%s=%s", k, v);
With %y, it can be written:
 p = PyBytes_FromFormat("%y=%y", key2, val2);
 if (p == NULL) { PyErr_NoMemory(); ... }
The '%y' may also accept bytearray and any object with the buffer interface (as the 'y' format of PyArg_Parse*() functions).