diff --git a/Include/fileutils.h b/Include/fileutils.h
index b4a683c176c..63ff80e62f3 100644
--- a/Include/fileutils.h
+++ b/Include/fileutils.h
@@ -121,18 +121,6 @@ PyAPI_FUNC(int) _Py_get_blocking(int fd);
 PyAPI_FUNC(int) _Py_set_blocking(int fd, int blocking);
 #endif   /* !MS_WINDOWS */
 
-#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
-/* A routine to check if a file descriptor is valid on Windows.  Returns 0
- * and sets errno to EBADF if it isn't.  This is to avoid Assertions
- * from various functions in the Windows CRT beginning with
- * Visual Studio 2005
- */
-int _PyVerify_fd(int fd);
-
-#else
-#define _PyVerify_fd(A) (1) /* dummy */
-#endif
-
 #endif   /* Py_LIMITED_API */
 
 #ifdef __cplusplus
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
index 12e5156fbb7..54cfb7fa7d6 100644
--- a/Modules/_io/fileio.c
+++ b/Modules/_io/fileio.c
@@ -117,18 +117,13 @@ internal_close(fileio *self)
         int fd = self->fd;
         self->fd = -1;
         /* fd is accessible and someone else may have closed it */
-        if (_PyVerify_fd(fd)) {
-            Py_BEGIN_ALLOW_THREADS
-            _Py_BEGIN_SUPPRESS_IPH
-            err = close(fd);
-            if (err < 0)
-                save_errno = errno;
-            _Py_END_SUPPRESS_IPH
-            Py_END_ALLOW_THREADS
-        } else {
+        Py_BEGIN_ALLOW_THREADS
+        _Py_BEGIN_SUPPRESS_IPH
+        err = close(fd);
+        if (err < 0)
             save_errno = errno;
-            err = -1;
-        }
+        _Py_END_SUPPRESS_IPH
+        Py_END_ALLOW_THREADS
     }
     if (err < 0) {
         errno = save_errno;
@@ -700,8 +695,6 @@ _io_FileIO_readall_impl(fileio *self)
 
     if (self->fd < 0)
         return err_closed();
-    if (!_PyVerify_fd(self->fd))
-        return PyErr_SetFromErrno(PyExc_IOError);
 
     _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
@@ -914,18 +907,15 @@ portable_lseek(int fd, PyObject *posobj, int whence)
             return NULL;
     }
 
-    if (_PyVerify_fd(fd)) {
-        Py_BEGIN_ALLOW_THREADS
-        _Py_BEGIN_SUPPRESS_IPH
+    Py_BEGIN_ALLOW_THREADS
+    _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
-        res = _lseeki64(fd, pos, whence);
+    res = _lseeki64(fd, pos, whence);
 #else
-        res = lseek(fd, pos, whence);
+    res = lseek(fd, pos, whence);
 #endif
-        _Py_END_SUPPRESS_IPH
-        Py_END_ALLOW_THREADS
-    } else
-        res = -1;
+    _Py_END_SUPPRESS_IPH
+    Py_END_ALLOW_THREADS
     if (res < 0)
         return PyErr_SetFromErrno(PyExc_IOError);
 
@@ -1116,10 +1106,7 @@ _io_FileIO_isatty_impl(fileio *self)
         return err_closed();
     Py_BEGIN_ALLOW_THREADS
     _Py_BEGIN_SUPPRESS_IPH
-    if (_PyVerify_fd(self->fd))
-        res = isatty(self->fd);
-    else
-        res = 0;
+    res = isatty(self->fd);
     _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     return PyBool_FromLong(res);
diff --git a/Modules/faulthandler.c b/Modules/faulthandler.c
index c2d30008fc7..1c1e4fb7d17 100644
--- a/Modules/faulthandler.c
+++ b/Modules/faulthandler.c
@@ -159,7 +159,7 @@ faulthandler_get_fileno(PyObject **file_ptr)
         fd = _PyLong_AsInt(file);
         if (fd == -1 && PyErr_Occurred())
             return -1;
-        if (fd < 0 || !_PyVerify_fd(fd)) {
+        if (fd < 0) {
             PyErr_SetString(PyExc_ValueError,
                             "file is not a valid file descripter");
             return -1;
diff --git a/Modules/mmapmodule.c b/Modules/mmapmodule.c
index b0015a5756f..73c37d07121 100644
--- a/Modules/mmapmodule.c
+++ b/Modules/mmapmodule.c
@@ -1326,10 +1326,6 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
      */
     if (fileno != -1 && fileno != 0) {
         /* Ensure that fileno is within the CRT's valid range */
-        if (!_PyVerify_fd(fileno)) {
-            PyErr_SetFromErrno(PyExc_OSError);
-            return NULL;
-        }
         _Py_BEGIN_SUPPRESS_IPH
         fh = (HANDLE)_get_osfhandle(fileno);
         _Py_END_SUPPRESS_IPH
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 4f5ec99e4ad..957a5f2b7db 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -1178,34 +1178,6 @@ PyLong_FromPy_off_t(Py_off_t offset)
 #endif
 }
 
-
-#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
-/* Legacy implementation of _PyVerify_fd_dup2 while transitioning to
- * MSVC 14.0. This should eventually be removed. (issue23524)
- */
-#define IOINFO_L2E 5
-#define IOINFO_ARRAYS 64
-#define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
-#define _NHANDLE_           (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
-#define _NO_CONSOLE_FILENO (intptr_t)-2
-
-/* the special case of checking dup2.  The target fd must be in a sensible range */
-static int
-_PyVerify_fd_dup2(int fd1, int fd2)
-{
-    if (!_PyVerify_fd(fd1))
-        return 0;
-    if (fd2 == _NO_CONSOLE_FILENO)
-        return 0;
-    if ((unsigned)fd2 < _NHANDLE_)
-        return 1;
-    else
-        return 0;
-}
-#else
-#define _PyVerify_fd_dup2(fd1, fd2) (_PyVerify_fd(fd1) && (fd2) >= 0)
-#endif
-
 #ifdef MS_WINDOWS
 
 static int
@@ -1409,9 +1381,6 @@ posix_fildes_fd(int fd, int (*func)(int))
     int res;
     int async_err = 0;
 
-    if (!_PyVerify_fd(fd))
-        return posix_error();
-
     do {
         Py_BEGIN_ALLOW_THREADS
         _Py_BEGIN_SUPPRESS_IPH
@@ -7549,8 +7518,6 @@ os_close_impl(PyObject *module, int fd)
 /*[clinic end generated code: output=2fe4e93602822c14 input=2bc42451ca5c3223]*/
 {
     int res;
-    if (!_PyVerify_fd(fd))
-        return posix_error();
     /* We do not want to retry upon EINTR: see http://lwn.net/Articles/576478/
      * and http://linux.derkeiler.com/Mailing-Lists/Kernel/2005-09/3000.html
      * for more details.
@@ -7583,9 +7550,8 @@ os_closerange_impl(PyObject *module, int fd_low, int fd_high)
     int i;
     Py_BEGIN_ALLOW_THREADS
     _Py_BEGIN_SUPPRESS_IPH
-    for (i = fd_low; i < fd_high; i++)
-        if (_PyVerify_fd(i))
-            close(i);
+    for (i = max(fd_low, 0); i < fd_high; i++)
+        close(i);
     _Py_END_SUPPRESS_IPH
     Py_END_ALLOW_THREADS
     Py_RETURN_NONE;
@@ -7629,7 +7595,7 @@ os_dup2_impl(PyObject *module, int fd, int fd2, int inheritable)
     int dup3_works = -1;
 #endif
 
-    if (!_PyVerify_fd_dup2(fd, fd2))
+    if (fd < 0 || fd2 < 0)
         return posix_error();
 
     /* dup2() can fail with EINTR if the target FD is already open, because it
@@ -7753,10 +7719,6 @@ os_lseek_impl(PyObject *module, int fd, Py_off_t position, int how)
 {
     Py_off_t result;
 
-    if (!_PyVerify_fd(fd)) {
-        posix_error();
-        return -1;
-    }
 #ifdef SEEK_SET
     /* Turn 0, 1, 2 into SEEK_{SET,CUR,END} */
     switch (how) {
@@ -7769,10 +7731,6 @@ os_lseek_impl(PyObject *module, int fd, Py_off_t position, int how)
     if (PyErr_Occurred())
         return -1;
 
-    if (!_PyVerify_fd(fd)) {
-        posix_error();
-        return -1;
-    }
     Py_BEGIN_ALLOW_THREADS
     _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
@@ -7980,10 +7938,6 @@ os_pread_impl(PyObject *module, int fd, int length, Py_off_t offset)
     buffer = PyBytes_FromStringAndSize((char *)NULL, length);
     if (buffer == NULL)
         return NULL;
-    if (!_PyVerify_fd(fd)) {
-        Py_DECREF(buffer);
-        return posix_error();
-    }
 
     do {
         Py_BEGIN_ALLOW_THREADS
@@ -8226,8 +8180,6 @@ os_isatty_impl(PyObject *module, int fd)
 /*[clinic end generated code: output=6a48c8b4e644ca00 input=08ce94aa1eaf7b5e]*/
 {
     int return_value;
-    if (!_PyVerify_fd(fd))
-        return 0;
     _Py_BEGIN_SUPPRESS_IPH
     return_value = isatty(fd);
     _Py_END_SUPPRESS_IPH
@@ -8419,11 +8371,6 @@ os_pwrite_impl(PyObject *module, int fd, Py_buffer *buffer, Py_off_t offset)
     Py_ssize_t size;
     int async_err = 0;
 
-    if (!_PyVerify_fd(fd)) {
-        posix_error();
-        return -1;
-    }
-
     do {
         Py_BEGIN_ALLOW_THREADS
         _Py_BEGIN_SUPPRESS_IPH
@@ -8606,9 +8553,6 @@ os_ftruncate_impl(PyObject *module, int fd, Py_off_t length)
     int result;
     int async_err = 0;
 
-    if (!_PyVerify_fd(fd))
-        return posix_error();
-
     do {
         Py_BEGIN_ALLOW_THREADS
         _Py_BEGIN_SUPPRESS_IPH
@@ -10979,11 +10923,6 @@ os_get_inheritable_impl(PyObject *module, int fd)
 /*[clinic end generated code: output=0445e20e149aa5b8 input=89ac008dc9ab6b95]*/
 {
     int return_value;
-    if (!_PyVerify_fd(fd)) {
-        posix_error();
-        return -1;
-    }
-
     _Py_BEGIN_SUPPRESS_IPH
     return_value = _Py_get_inheritable(fd);
     _Py_END_SUPPRESS_IPH
@@ -11005,8 +10944,6 @@ os_set_inheritable_impl(PyObject *module, int fd, int inheritable)
 /*[clinic end generated code: output=f1b1918a2f3c38c2 input=9ceaead87a1e2402]*/
 {
     int result;
-    if (!_PyVerify_fd(fd))
-        return posix_error();
 
     _Py_BEGIN_SUPPRESS_IPH
     result = _Py_set_inheritable(fd, inheritable, NULL);
@@ -11080,9 +11017,6 @@ posix_get_blocking(PyObject *self, PyObject *args)
     if (!PyArg_ParseTuple(args, "i:get_blocking", &fd))
         return NULL;
 
-    if (!_PyVerify_fd(fd))
-        return posix_error();
-
     _Py_BEGIN_SUPPRESS_IPH
     blocking = _Py_get_blocking(fd);
     _Py_END_SUPPRESS_IPH
@@ -11106,9 +11040,6 @@ posix_set_blocking(PyObject *self, PyObject *args)
     if (!PyArg_ParseTuple(args, "ii:set_blocking", &fd, &blocking))
         return NULL;
 
-    if (!_PyVerify_fd(fd))
-        return posix_error();
-
     _Py_BEGIN_SUPPRESS_IPH
     result = _Py_set_blocking(fd, blocking);
     _Py_END_SUPPRESS_IPH
diff --git a/Modules/signalmodule.c b/Modules/signalmodule.c
index e0780917c87..7eef0b5e59b 100644
--- a/Modules/signalmodule.c
+++ b/Modules/signalmodule.c
@@ -579,7 +579,7 @@ signal_set_wakeup_fd(PyObject *self, PyObject *args)
             }
 
             fd = (int)sockfd;
-            if ((SOCKET_T)fd != sockfd || !_PyVerify_fd(fd)) {
+            if ((SOCKET_T)fd != sockfd) {
                 PyErr_SetString(PyExc_ValueError, "invalid fd");
                 return NULL;
             }
@@ -609,11 +609,6 @@ signal_set_wakeup_fd(PyObject *self, PyObject *args)
     if (fd != -1) {
         int blocking;
 
-        if (!_PyVerify_fd(fd)) {
-            PyErr_SetString(PyExc_ValueError, "invalid fd");
-            return NULL;
-        }
-
         if (_Py_fstat(fd, &status) != 0)
             return NULL;
 
diff --git a/PC/msvcrtmodule.c b/PC/msvcrtmodule.c
index 02927416348..c9d1e6cec60 100644
--- a/PC/msvcrtmodule.c
+++ b/PC/msvcrtmodule.c
@@ -189,16 +189,11 @@ msvcrt_get_osfhandle_impl(PyObject *module, int fd)
 {
     intptr_t handle = -1;
 
-    if (!_PyVerify_fd(fd)) {
-        PyErr_SetFromErrno(PyExc_IOError);
-    }
-    else {
     _Py_BEGIN_SUPPRESS_IPH
-        handle = _get_osfhandle(fd);
+    handle = _get_osfhandle(fd);
     _Py_END_SUPPRESS_IPH
-        if (handle == -1)
-            PyErr_SetFromErrno(PyExc_IOError);
-    }
+    if (handle == -1)
+        PyErr_SetFromErrno(PyExc_IOError);
 
     return handle;
 }
diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index 28c7b6d7fff..9522c794e87 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -41,10 +41,7 @@ my_fgets(char *buf, int len, FILE *fp)
             (void)(PyOS_InputHook)();
         errno = 0;
         clearerr(fp);
-        if (_PyVerify_fd(fileno(fp)))
-            p = fgets(buf, len, fp);
-        else
-            p = NULL;
+        p = fgets(buf, len, fp);
         if (p != NULL)
             return 0; /* No error */
         err = errno;
diff --git a/Python/fileutils.c b/Python/fileutils.c
index 06531d97260..7ce3b63306c 100644
--- a/Python/fileutils.c
+++ b/Python/fileutils.c
@@ -44,7 +44,7 @@ _Py_device_encoding(int fd)
 #endif
     int valid;
     _Py_BEGIN_SUPPRESS_IPH
-    valid = _PyVerify_fd(fd) && isatty(fd);
+    valid = isatty(fd);
     _Py_END_SUPPRESS_IPH
     if (!valid)
         Py_RETURN_NONE;
@@ -613,13 +613,9 @@ _Py_fstat_noraise(int fd, struct _Py_stat_struct *status)
     HANDLE h;
     int type;
 
-    if (!_PyVerify_fd(fd))
-        h = INVALID_HANDLE_VALUE;
-    else {
-        _Py_BEGIN_SUPPRESS_IPH
-        h = (HANDLE)_get_osfhandle(fd);
-        _Py_END_SUPPRESS_IPH
-    }
+    _Py_BEGIN_SUPPRESS_IPH
+    h = (HANDLE)_get_osfhandle(fd);
+    _Py_END_SUPPRESS_IPH
 
     if (h == INVALID_HANDLE_VALUE) {
         /* errno is already set by _get_osfhandle, but we also set
@@ -742,12 +738,6 @@ get_inheritable(int fd, int raise)
     HANDLE handle;
     DWORD flags;
 
-    if (!_PyVerify_fd(fd)) {
-        if (raise)
-            PyErr_SetFromErrno(PyExc_OSError);
-        return -1;
-    }
-
     _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
     _Py_END_SUPPRESS_IPH
@@ -819,12 +809,6 @@ set_inheritable(int fd, int inheritable, int raise, int *atomic_flag_works)
     }
 
 #ifdef MS_WINDOWS
-    if (!_PyVerify_fd(fd)) {
-        if (raise)
-            PyErr_SetFromErrno(PyExc_OSError);
-        return -1;
-    }
-
     _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
     _Py_END_SUPPRESS_IPH
@@ -1190,14 +1174,6 @@ _Py_read(int fd, void *buf, size_t count)
      * handler raised an exception. */
     assert(!PyErr_Occurred());
 
-    if (!_PyVerify_fd(fd)) {
-        /* save/restore errno because PyErr_SetFromErrno() can modify it */
-        err = errno;
-        PyErr_SetFromErrno(PyExc_OSError);
-        errno = err;
-        return -1;
-    }
-
 #ifdef MS_WINDOWS
     if (count > INT_MAX) {
         /* On Windows, the count parameter of read() is an int */
@@ -1251,16 +1227,6 @@ _Py_write_impl(int fd, const void *buf, size_t count, int gil_held)
     int err;
     int async_err = 0;
 
-    if (!_PyVerify_fd(fd)) {
-        if (gil_held) {
-            /* save/restore errno because PyErr_SetFromErrno() can modify it */
-            err = errno;
-            PyErr_SetFromErrno(PyExc_OSError);
-            errno = err;
-        }
-        return -1;
-    }
-
     _Py_BEGIN_SUPPRESS_IPH
 #ifdef MS_WINDOWS
     if (count > 32767 && isatty(fd)) {
@@ -1497,11 +1463,6 @@ _Py_dup(int fd)
     assert(PyGILState_Check());
 #endif
 
-    if (!_PyVerify_fd(fd)) {
-        PyErr_SetFromErrno(PyExc_OSError);
-        return -1;
-    }
-
 #ifdef MS_WINDOWS
     _Py_BEGIN_SUPPRESS_IPH
     handle = (HANDLE)_get_osfhandle(fd);
@@ -1624,84 +1585,3 @@ error:
     return -1;
 }
 #endif
-
-#if defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900
-/* Legacy implementation of _PyVerify_fd while transitioning to
- * MSVC 14.0. This should eventually be removed. (issue23524)
- */
-
-/* Microsoft CRT in VS2005 and higher will verify that a filehandle is
- * valid and raise an assertion if it isn't.
- * Normally, an invalid fd is likely to be a C program error and therefore
- * an assertion can be useful, but it does contradict the POSIX standard
- * which for write(2) states:
- *    "Otherwise, -1 shall be returned and errno set to indicate the error."
- *    "[EBADF] The fildes argument is not a valid file descriptor open for
- *     writing."
- * Furthermore, python allows the user to enter any old integer
- * as a fd and should merely raise a python exception on error.
- * The Microsoft CRT doesn't provide an official way to check for the
- * validity of a file descriptor, but we can emulate its internal behaviour
- * by using the exported __pinfo data member and knowledge of the
- * internal structures involved.
- * The structures below must be updated for each version of visual studio
- * according to the file internal.h in the CRT source, until MS comes
- * up with a less hacky way to do this.
- * (all of this is to avoid globally modifying the CRT behaviour using
- * _set_invalid_parameter_handler() and _CrtSetReportMode())
- */
-/* The actual size of the structure is determined at runtime.
- * Only the first items must be present.
- */
-typedef struct {
-    intptr_t osfhnd;
-    char osfile;
-} my_ioinfo;
-
-extern __declspec(dllimport) char * __pioinfo[];
-#define IOINFO_L2E 5
-#define IOINFO_ARRAYS 64
-#define IOINFO_ARRAY_ELTS   (1 << IOINFO_L2E)
-#define _NHANDLE_           (IOINFO_ARRAYS * IOINFO_ARRAY_ELTS)
-#define FOPEN 0x01
-#define _NO_CONSOLE_FILENO (intptr_t)-2
-
-/* This function emulates what the windows CRT does to validate file handles */
-int
-_PyVerify_fd(int fd)
-{
-    const int i1 = fd >> IOINFO_L2E;
-    const int i2 = fd & ((1 << IOINFO_L2E) - 1);
-
-    static size_t sizeof_ioinfo = 0;
-
-    /* Determine the actual size of the ioinfo structure,
-     * as used by the CRT loaded in memory
-     */
-    if (sizeof_ioinfo == 0 && __pioinfo[0] != NULL) {
-        sizeof_ioinfo = _msize(__pioinfo[0]) / IOINFO_ARRAY_ELTS;
-    }
-    if (sizeof_ioinfo == 0) {
-        /* This should not happen... */
-        goto fail;
-    }
-
-    /* See that it isn't a special CLEAR fileno */
-    if (fd != _NO_CONSOLE_FILENO) {
-        /* Microsoft CRT would check that 0<=fd<_nhandle but we can't do that.  Instead
-         * we check pointer validity and other info
-         */
-        if (0 <= i1 && i1 < IOINFO_ARRAYS && __pioinfo[i1] != NULL) {
-            /* finally, check that the file is open */
-            my_ioinfo* info = (my_ioinfo*)(__pioinfo[i1] + i2 * sizeof_ioinfo);
-            if (info->osfile & FOPEN) {
-                return 1;
-            }
-        }
-    }
-  fail:
-    errno = EBADF;
-    return 0;
-}
-
-#endif /* defined _MSC_VER && _MSC_VER >= 1400 && _MSC_VER < 1900 */
diff --git a/Python/pylifecycle.c b/Python/pylifecycle.c
index 3f3b614a47a..dab5c3c1ab6 100644
--- a/Python/pylifecycle.c
+++ b/Python/pylifecycle.c
@@ -1026,7 +1026,7 @@ static int
 is_valid_fd(int fd)
 {
     int fd2;
-    if (fd < 0 || !_PyVerify_fd(fd))
+    if (fd < 0)
         return 0;
     _Py_BEGIN_SUPPRESS_IPH
     /* Prefer dup() over fstat(). fstat() can require input/output whereas