_PySys_Init(): It's rarely a good idea to size a buffer to the exact maximum size someone guesses is needed. In this case, if we're really worried about extreme integers, then "cp%d" can actually need 14 bytes (2 for "cp" + 1 for \0 at the end + 11 for -(2**31-1)). So reserve 128 bytes instead -- nothing is actually saved by making a stack-local buffer tiny.