diff --git a/Lib/asynchat.py b/Lib/asynchat.py
index 57459a0..392ee61 100644
--- a/Lib/asynchat.py
+++ b/Lib/asynchat.py
@@ -133,7 +133,7 @@
                 # no terminator, collect it all
                 self.collect_incoming_data (self.ac_in_buffer)
                 self.ac_in_buffer = ''
-            elif isinstance(terminator, int) or isinstance(terminator, long):
+            elif isinstance(terminator, (int, long)):
                 # numeric terminator
                 n = terminator
                 if lb < n:
diff --git a/Lib/compiler/pyassem.py b/Lib/compiler/pyassem.py
index f52f7d0..b82073e 100644
--- a/Lib/compiler/pyassem.py
+++ b/Lib/compiler/pyassem.py
@@ -581,7 +581,7 @@
 
 def twobyte(val):
     """Convert an int argument into high and low bytes"""
-    assert isinstance(val, int)
+    assert isinstance(val, (int, long))
     return divmod(val, 256)
 
 class LineAddrTable:
diff --git a/Lib/compiler/transformer.py b/Lib/compiler/transformer.py
index d4f4613..ba5c03c 100644
--- a/Lib/compiler/transformer.py
+++ b/Lib/compiler/transformer.py
@@ -1526,7 +1526,7 @@
 def debug_tree(tree):
     l = []
     for elt in tree:
-        if isinstance(elt, int):
+        if isinstance(elt, (int, long)):
             l.append(_names.get(elt, elt))
         elif isinstance(elt, str):
             l.append(elt)
diff --git a/Lib/idlelib/PyShell.py b/Lib/idlelib/PyShell.py
index 3ea1a7d..fdd7cb1 100755
--- a/Lib/idlelib/PyShell.py
+++ b/Lib/idlelib/PyShell.py
@@ -1370,7 +1370,7 @@
             raise ValueError("read from closed file")
         if size is None:
             size = -1
-        elif not isinstance(size, int):
+        elif not isinstance(size, (int, long)):
             raise TypeError('must be int, not ' + type(size).__name__)
         result = self._line_buffer
         self._line_buffer = ''
@@ -1393,7 +1393,7 @@
             raise ValueError("read from closed file")
         if size is None:
             size = -1
-        elif not isinstance(size, int):
+        elif not isinstance(size, (int, long)):
             raise TypeError('must be int, not ' + type(size).__name__)
         line = self._line_buffer or self.shell.readline()
         if size < 0:
diff --git a/Lib/imaplib.py b/Lib/imaplib.py
index 826eea2..f813ece 100644
--- a/Lib/imaplib.py
+++ b/Lib/imaplib.py
@@ -1409,7 +1409,7 @@
     be in the correct format.
     """
 
-    if isinstance(date_time, (int, float)):
+    if isinstance(date_time, (int, long, float)):
         tt = time.localtime(date_time)
     elif isinstance(date_time, (tuple, time.struct_time)):
         tt = date_time
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 64e9924..365f420 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -1174,9 +1174,9 @@
                 elif isinstance(v, (tuple, list)):
                     nv = []
                     for item in v:
-                        if not isinstance(item, (basestring, int)):
+                        if not isinstance(item, (basestring, int, long)):
                             break
-                        elif isinstance(item, int):
+                        elif isinstance(item, (int, long)):
                             nv.append('%d' % item)
                         else:
                             # format it to proper Tcl code if it contains space
diff --git a/Lib/lib-tk/turtle.py b/Lib/lib-tk/turtle.py
index 264318e..52e669b 100644
--- a/Lib/lib-tk/turtle.py
+++ b/Lib/lib-tk/turtle.py
@@ -276,7 +276,7 @@
             return self[0]*other[0]+self[1]*other[1]
         return Vec2D(self[0]*other, self[1]*other)
     def __rmul__(self, other):
-        if isinstance(other, int) or isinstance(other, float):
+        if isinstance(other, (int, long, float)):
             return Vec2D(self[0]*other, self[1]*other)
     def __sub__(self, other):
         return Vec2D(self[0]-other[0], self[1]-other[1])
@@ -2352,7 +2352,7 @@
             self._resizemode = p["resizemode"]
         if "stretchfactor" in p:
             sf = p["stretchfactor"]
-            if isinstance(sf, (int, float)):
+            if isinstance(sf, (int, long, float)):
                 sf = (sf, sf)
             self._stretchfactor = sf
         if "outline" in p:
diff --git a/Lib/lib2to3/pgen2/pgen.py b/Lib/lib2to3/pgen2/pgen.py
index ed16992..be4fcad 100644
--- a/Lib/lib2to3/pgen2/pgen.py
+++ b/Lib/lib2to3/pgen2/pgen.py
@@ -74,7 +74,7 @@
             else:
                 # A named token (NAME, NUMBER, STRING)
                 itoken = getattr(token, label, None)
-                assert isinstance(itoken, int), label
+                assert isinstance(itoken, (int, long)), label
                 assert itoken in token.tok_name, label
                 if itoken in c.tokens:
                     return c.tokens[itoken]
diff --git a/Lib/logging/__init__.py b/Lib/logging/__init__.py
index caf151d..2220582 100644
--- a/Lib/logging/__init__.py
+++ b/Lib/logging/__init__.py
@@ -1222,7 +1222,7 @@
 
         logger.log(level, "We have a %s", "mysterious problem", exc_info=1)
         """
-        if not isinstance(level, int):
+        if not isinstance(level, (int, long)):
             if raiseExceptions:
                 raise TypeError("level must be an integer")
             else:
diff --git a/Lib/multiprocessing/pool.py b/Lib/multiprocessing/pool.py
index 991f87f..ceb93aa 100644
--- a/Lib/multiprocessing/pool.py
+++ b/Lib/multiprocessing/pool.py
@@ -86,7 +86,7 @@
 
 
 def worker(inqueue, outqueue, initializer=None, initargs=(), maxtasks=None):
-    assert maxtasks is None or (type(maxtasks) == int and maxtasks > 0)
+    assert maxtasks is None or (type(maxtasks) in (int, long) and maxtasks > 0)
     put = outqueue.put
     get = inqueue.get
     if hasattr(inqueue, '_writer'):
diff --git a/Lib/multiprocessing/process.py b/Lib/multiprocessing/process.py
index 44c1e44..f6b03b1 100644
--- a/Lib/multiprocessing/process.py
+++ b/Lib/multiprocessing/process.py
@@ -227,7 +227,7 @@
             else:
                 status = 'started'
 
-        if type(status) is int:
+        if type(status) in (int, long):
             if status == 0:
                 status = 'stopped'
             else:
@@ -262,8 +262,8 @@
         except SystemExit, e:
             if not e.args:
                 exitcode = 1
-            elif isinstance(e.args[0], int):
-                exitcode = e.args[0]
+            elif isinstance(e.args[0], (int, long)):
+                exitcode = int(e.args[0])
             else:
                 sys.stderr.write(str(e.args[0]) + '\n')
                 sys.stderr.flush()
diff --git a/Lib/multiprocessing/util.py b/Lib/multiprocessing/util.py
index 092b61c..394cc44 100644
--- a/Lib/multiprocessing/util.py
+++ b/Lib/multiprocessing/util.py
@@ -174,7 +174,7 @@
     Class which supports object finalization using weakrefs
     '''
     def __init__(self, obj, callback, args=(), kwargs=None, exitpriority=None):
-        assert exitpriority is None or type(exitpriority) is int
+        assert exitpriority is None or type(exitpriority) in (int, long)
 
         if obj is not None:
             self._weakref = weakref.ref(obj, self)
diff --git a/Lib/pickletools.py b/Lib/pickletools.py
index 8de53dd..c9366c8 100644
--- a/Lib/pickletools.py
+++ b/Lib/pickletools.py
@@ -185,7 +185,7 @@
         assert isinstance(name, str)
         self.name = name
 
-        assert isinstance(n, int) and (n >= 0 or
+        assert isinstance(n, (int, long)) and (n >= 0 or
                                        n in (UP_TO_NEWLINE,
                                              TAKEN_FROM_ARGUMENT1,
                                              TAKEN_FROM_ARGUMENT4))
@@ -873,7 +873,7 @@
             assert isinstance(x, StackObject)
         self.stack_after = stack_after
 
-        assert isinstance(proto, int) and 0 <= proto <= 2
+        assert isinstance(proto, (int, long)) and 0 <= proto <= 2
         self.proto = proto
 
         assert isinstance(doc, str)
diff --git a/Lib/subprocess.py b/Lib/subprocess.py
index 2022e97..407141e 100644
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -507,7 +507,7 @@
                     p2cread, _ = _subprocess.CreatePipe(None, 0)
             elif stdin == PIPE:
                 p2cread, p2cwrite = _subprocess.CreatePipe(None, 0)
-            elif isinstance(stdin, int):
+            elif isinstance(stdin, (int, long)):
                 p2cread = msvcrt.get_osfhandle(stdin)
             else:
                 # Assuming file-like object
@@ -524,7 +524,7 @@
                     _, c2pwrite = _subprocess.CreatePipe(None, 0)
             elif stdout == PIPE:
                 c2pread, c2pwrite = _subprocess.CreatePipe(None, 0)
-            elif isinstance(stdout, int):
+            elif isinstance(stdout, (int, long)):
                 c2pwrite = msvcrt.get_osfhandle(stdout)
             else:
                 # Assuming file-like object
@@ -543,7 +543,7 @@
                 errread, errwrite = _subprocess.CreatePipe(None, 0)
             elif stderr == STDOUT:
                 errwrite = c2pwrite
-            elif isinstance(stderr, int):
+            elif isinstance(stderr, (int, long)):
                 errwrite = msvcrt.get_osfhandle(stderr)
             else:
                 # Assuming file-like object
@@ -800,7 +800,7 @@
             elif stdin == PIPE:
                 p2cread, p2cwrite = self.pipe_cloexec()
                 to_close.update((p2cread, p2cwrite))
-            elif isinstance(stdin, int):
+            elif isinstance(stdin, (int, long)):
                 p2cread = stdin
             else:
                 # Assuming file-like object
@@ -811,7 +811,7 @@
             elif stdout == PIPE:
                 c2pread, c2pwrite = self.pipe_cloexec()
                 to_close.update((c2pread, c2pwrite))
-            elif isinstance(stdout, int):
+            elif isinstance(stdout, (int, long)):
                 c2pwrite = stdout
             else:
                 # Assuming file-like object
@@ -827,7 +827,7 @@
                     errwrite = c2pwrite
                 else: # child's stdout is not set, use parent's stdout
                     errwrite = sys.__stdout__.fileno()
-            elif isinstance(stderr, int):
+            elif isinstance(stderr, (int, long)):
                 errwrite = stderr
             else:
                 # Assuming file-like object
diff --git a/Lib/unittest/signals.py b/Lib/unittest/signals.py
index e6a5fc5..9fbcc9f 100644
--- a/Lib/unittest/signals.py
+++ b/Lib/unittest/signals.py
@@ -10,7 +10,7 @@
     def __init__(self, default_handler):
         self.called = False
         self.original_handler = default_handler
-        if isinstance(default_handler, int):
+        if isinstance(default_handler, (int, long)):
             if default_handler == signal.SIG_DFL:
                 # Pretend it's signal.default_int_handler instead.
                 default_handler = signal.default_int_handler
diff --git a/Lib/warnings.py b/Lib/warnings.py
index b0d53aa..41f700b 100644
--- a/Lib/warnings.py
+++ b/Lib/warnings.py
@@ -84,10 +84,10 @@
            "category must be a class"
     assert issubclass(category, Warning), "category must be a Warning subclass"
     assert isinstance(module, basestring), "module must be a string"
-    assert isinstance(lineno, int) and lineno >= 0, \
+    assert isinstance(lineno, (int, long)) and lineno >= 0, \
            "lineno must be an int >= 0"
     item = (action, re.compile(message, re.I), category,
-            re.compile(module), lineno)
+            re.compile(module), int(lineno))
     if append:
         filters.append(item)
     else:
@@ -105,9 +105,9 @@
     """
     assert action in ("error", "ignore", "always", "default", "module",
                       "once"), "invalid action: %r" % (action,)
-    assert isinstance(lineno, int) and lineno >= 0, \
+    assert isinstance(lineno, (int, long)) and lineno >= 0, \
            "lineno must be an int >= 0"
-    item = (action, None, category, None, lineno)
+    item = (action, None, category, None, int(lineno))
     if append:
         filters.append(item)
     else:
diff --git a/Misc/NEWS b/Misc/NEWS
index 97d77a6..da87000 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -15,6 +15,8 @@
 Library
 -------
 
+- Issue #28998: More APIs now support longs as well as ints.
+
 - Issue 28923: Remove editor artifacts from Tix.py,
   including encoding not recognized by codecs.lookup.
 
diff --git a/Modules/_csv.c b/Modules/_csv.c
index 4589f06..c39c0f1 100644
--- a/Modules/_csv.c
+++ b/Modules/_csv.c
@@ -220,15 +220,19 @@
 static int
 _set_int(const char *name, int *target, PyObject *src, int dflt)
 {
+    int value;
     if (src == NULL)
         *target = dflt;
     else {
-        if (!PyInt_Check(src)) {
+        if (!PyInt_Check(src) && !PyLong_Check(src)) {
             PyErr_Format(PyExc_TypeError,
                          "\"%s\" must be an integer", name);
             return -1;
         }
-        *target = PyInt_AsLong(src);
+        value = PyInt_AsLong(src);
+        if (value == -1 && PyErr_Occurred())
+            return -1;
+        *target = value;
     }
     return 0;
 }
@@ -1443,17 +1447,20 @@
 csv_field_size_limit(PyObject *module, PyObject *args)
 {
     PyObject *new_limit = NULL;
-    long old_limit = field_limit;
+    long old_limit = field_limit, limit;
 
     if (!PyArg_UnpackTuple(args, "field_size_limit", 0, 1, &new_limit))
         return NULL;
     if (new_limit != NULL) {
-        if (!PyInt_Check(new_limit)) {
+        if (!PyInt_Check(new_limit) && !PyLong_Check(new_limit)) {
             PyErr_Format(PyExc_TypeError,
                          "limit must be an integer");
             return NULL;
         }
-        field_limit = PyInt_AsLong(new_limit);
+        limit = PyInt_AsLong(new_limit);
+        if (limit == -1 && PyErr_Occurred())
+            return NULL;
+        field_limit = limit;
     }
     return PyInt_FromLong(old_limit);
 }
diff --git a/Modules/_cursesmodule.c b/Modules/_cursesmodule.c
index e478a57..9eab741 100644
--- a/Modules/_cursesmodule.c
+++ b/Modules/_cursesmodule.c
@@ -194,8 +194,10 @@
 static int
 PyCurses_ConvertToChtype(PyObject *obj, chtype *ch)
 {
-    if (PyInt_Check(obj)) {
+    if (PyInt_Check(obj) || PyLong_Check(obj)) {
         *ch = (chtype) PyInt_AsLong(obj);
+        if (*ch == (chtype) -1 && PyErr_Occurred())
+            return 0;
     } else if(PyString_Check(obj)
               && (PyString_Size(obj) == 1)) {
         *ch = (chtype) *PyString_AsString(obj);
@@ -2576,8 +2578,11 @@
 
     if (!PyArg_ParseTuple(args,"O;ch or int",&temp)) return NULL;
 
-    if (PyInt_Check(temp))
+    if (PyInt_Check(temp) || PyLong_Check(temp)) {
         ch = (chtype) PyInt_AsLong(temp);
+        if (ch == (chtype) -1 && PyErr_Occurred())
+            return NULL;
+    }
     else if (PyString_Check(temp))
         ch = (chtype) *PyString_AsString(temp);
     else {
@@ -2598,8 +2603,11 @@
 
     if (!PyArg_ParseTuple(args,"O;ch or int",&temp)) return NULL;
 
-    if (PyInt_Check(temp))
+    if (PyInt_Check(temp) || PyLong_Check(temp)) {
         ch = (int) PyInt_AsLong(temp);
+        if (ch == -1 && PyErr_Occurred())
+            return NULL;
+    }
     else if (PyString_Check(temp))
         ch = (int) *PyString_AsString(temp);
     else {
diff --git a/Modules/dlmodule.c b/Modules/dlmodule.c
index dfecf9d..7a6686e 100644
--- a/Modules/dlmodule.c
+++ b/Modules/dlmodule.c
@@ -107,8 +107,11 @@
     }
     for (i = 1; i < n; i++) {
         PyObject *v = PyTuple_GetItem(args, i);
-        if (PyInt_Check(v))
+        if (PyInt_Check(v) || PyLong_Check(v)) {
             alist[i-1] = PyInt_AsLong(v);
+            if (alist[i-1] == -1 && PyErr_Occurred())
+                return NULL;
+        }
         else if (PyString_Check(v))
             alist[i-1] = (long)PyString_AsString(v);
         else if (v == Py_None)
diff --git a/Modules/svmodule.c b/Modules/svmodule.c
index 1519065..42c49c8 100644
--- a/Modules/svmodule.c
+++ b/Modules/svmodule.c
@@ -686,7 +686,7 @@
             if (!cell)
                 goto finally;
 
-            if (!PyInt_Check(cell)) {
+            if (!PyInt_Check(cell) && !PyLong_Check(cell)) {
                 PyErr_BadArgument();
                 goto finally;
             }
@@ -757,7 +757,7 @@
         if (!v)
             goto finally;
 
-        if (!PyInt_Check(v)) {
+        if (!PyInt_Check(v) && !PyLong_Check(v)) {
             PyErr_BadArgument();
             goto finally;
         }
diff --git a/Modules/termios.c b/Modules/termios.c
index 57f30dc..9d4d780 100644
--- a/Modules/termios.c
+++ b/Modules/termios.c
@@ -185,8 +185,11 @@
 
         if (PyString_Check(v) && PyString_Size(v) == 1)
             mode.c_cc[i] = (cc_t) * PyString_AsString(v);
-        else if (PyInt_Check(v))
+        else if (PyInt_Check(v) || PyLong_Check(v)) {
             mode.c_cc[i] = (cc_t) PyInt_AsLong(v);
+            if (mode.c_cc[i] == (cc_t) -1 && PyErr_Occurred())
+                return NULL;
+        }
         else {
             PyErr_SetString(PyExc_TypeError,
      "tcsetattr: elements of attributes must be characters or integers");
diff --git a/Objects/intobject.c b/Objects/intobject.c
index 0c5ea65..04e4d29 100644
--- a/Objects/intobject.c
+++ b/Objects/intobject.c
@@ -155,6 +155,11 @@
         return -1;
     }
 
+    if (PyLong_CheckExact(op)) {
+        /* avoid creating temporary int object */
+        return PyLong_AsLong(op);
+    }
+
     io = (PyIntObject*) (*nb->nb_int) (op);
     if (io == NULL)
         return -1;
@@ -163,8 +168,6 @@
             /* got a long? => retry int conversion */
             val = PyLong_AsLong((PyObject *)io);
             Py_DECREF(io);
-            if ((val == -1) && PyErr_Occurred())
-                return -1;
             return val;
         }
         else