http://bugs.python.org/issue17797 http://connect.microsoft.com/VisualStudio/feedback/details/785119/ Visual Studio 2012 changed return value for fileno function that breaks when python tries to check/setup stdin/out/err GetStdHandle on Windows XP behaves contrary to the documentation... diff -ur python3.org/Python/pythonrun.c python3/Python/pythonrun.c --- python3.org/Python/pythonrun.c 2014-05-24 16:36:20.361672900 +0200 +++ python3/Python/pythonrun.c 2014-05-24 16:37:38.424159100 +0200 @@ -1036,7 +1036,15 @@ int status = 0, fd; PyObject * encoding_attr; char *encoding = NULL, *errors; - +#ifdef MS_WINDOWS + OSVERSIONINFOEX osvi; + BOOL bIsWindowsXP; + + ZeroMemory(&osvi, sizeof(osvi)); + osvi.dwOSVersionInfoSize = sizeof(osvi); + GetVersionEx(&osvi); + bIsWindowsXP = (osvi.dwMajorVersion < 6); +#endif /* Hack to avoid a nasty recursion issue when Python is invoked in verbose mode: pre-import the Latin-1 and UTF-8 codecs */ if ((m = PyImport_ImportModule("encodings.utf_8")) == NULL) { @@ -1084,7 +1092,11 @@ * and fileno() may point to an invalid file descriptor. For example * GUI apps don't have valid standard streams by default. */ +#ifdef MS_WINDOWS + if (!is_valid_fd(fd) || GetStdHandle(STD_INPUT_HANDLE) == NULL || bIsWindowsXP) { +#else if (!is_valid_fd(fd)) { +#endif std = Py_None; Py_INCREF(std); } @@ -1099,7 +1111,11 @@ /* Set sys.stdout */ fd = fileno(stdout); +#ifdef MS_WINDOWS + if (!is_valid_fd(fd) || GetStdHandle(STD_OUTPUT_HANDLE) == NULL || bIsWindowsXP) { +#else if (!is_valid_fd(fd)) { +#endif std = Py_None; Py_INCREF(std); } @@ -1115,7 +1131,11 @@ #if 1 /* Disable this if you have trouble debugging bootstrap stuff */ /* Set sys.stderr, replaces the preliminary stderr */ fd = fileno(stderr); +#ifdef MS_WINDOWS + if (!is_valid_fd(fd) || GetStdHandle(STD_ERROR_HANDLE) == NULL || bIsWindowsXP) { +#else if (!is_valid_fd(fd)) { +#endif std = Py_None; Py_INCREF(std); }