diff -r 2917a3ce988e Doc/library/curses.ascii.rst
--- a/Doc/library/curses.ascii.rst	Sat May 21 21:36:29 2016 +0300
+++ b/Doc/library/curses.ascii.rst	Sat May 21 22:46:51 2016 +0300
@@ -113,12 +113,12 @@ C library:
 
 .. function:: isblank(c)
 
-   Checks for an ASCII whitespace character.
+   Checks for an ASCII whitespace character; space or horizontal tab.
 
 
 .. function:: iscntrl(c)
 
-   Checks for an ASCII control character (in the range 0x00 to 0x1f).
+   Checks for an ASCII control character (in the range 0x00 to 0x1f or 0x7f).
 
 
 .. function:: isdigit(c)
diff -r 2917a3ce988e Lib/curses/ascii.py
--- a/Lib/curses/ascii.py	Sat May 21 21:36:29 2016 +0300
+++ b/Lib/curses/ascii.py	Sat May 21 22:46:51 2016 +0300
@@ -54,13 +54,13 @@ def _ctoi(c):
 def isalnum(c): return isalpha(c) or isdigit(c)
 def isalpha(c): return isupper(c) or islower(c)
 def isascii(c): return _ctoi(c) <= 127          # ?
-def isblank(c): return _ctoi(c) in (8,32)
-def iscntrl(c): return _ctoi(c) <= 31
+def isblank(c): return _ctoi(c) in (9, 32)
+def iscntrl(c): return _ctoi(c) <= 31 or _ctoi(c) == 127
 def isdigit(c): return _ctoi(c) >= 48 and _ctoi(c) <= 57
 def isgraph(c): return _ctoi(c) >= 33 and _ctoi(c) <= 126
 def islower(c): return _ctoi(c) >= 97 and _ctoi(c) <= 122
 def isprint(c): return _ctoi(c) >= 32 and _ctoi(c) <= 126
-def ispunct(c): return _ctoi(c) != 32 and not isalnum(c)
+def ispunct(c): return isgraph(c) and not isalnum(c)
 def isspace(c): return _ctoi(c) in (9, 10, 11, 12, 13, 32)
 def isupper(c): return _ctoi(c) >= 65 and _ctoi(c) <= 90
 def isxdigit(c): return isdigit(c) or \
diff -r 2917a3ce988e Lib/test/test_curses.py
--- a/Lib/test/test_curses.py	Sat May 21 21:36:29 2016 +0300
+++ b/Lib/test/test_curses.py	Sat May 21 22:46:51 2016 +0300
@@ -10,6 +10,7 @@
 #
 
 import os
+import string
 import sys
 import tempfile
 import unittest
@@ -397,6 +398,55 @@ class MiscTests(unittest.TestCase):
 
 class TestAscii(unittest.TestCase):
 
+    def test_controlnames(self):
+        for name in curses.ascii.controlnames:
+            self.assertTrue(hasattr(curses.ascii, name), name)
+
+    def test_ctypes(self):
+        def check(func, expected):
+            with self.subTest(ch=c, func=func):
+                self.assertEqual(func(i), expected)
+                self.assertEqual(func(c), expected)
+
+        for i in range(256):
+            c = chr(i)
+            b = bytes([i])
+            check(curses.ascii.isalnum, b.isalnum())
+            check(curses.ascii.isalpha, b.isalpha())
+            check(curses.ascii.isdigit, b.isdigit())
+            check(curses.ascii.islower, b.islower())
+            check(curses.ascii.isspace, b.isspace())
+            check(curses.ascii.isupper, b.isupper())
+
+            check(curses.ascii.isascii, i < 128)
+            check(curses.ascii.ismeta, i >= 128)
+            check(curses.ascii.isctrl, i < 32)
+            check(curses.ascii.iscntrl, i < 32 or i == 127)
+            check(curses.ascii.isblank, c in ' \t')
+            check(curses.ascii.isgraph, 32 < i <= 126)
+            check(curses.ascii.isprint, 32 <= i <= 126)
+            check(curses.ascii.ispunct, c in string.punctuation)
+            check(curses.ascii.isxdigit, c in string.hexdigits)
+
+    def test_ascii(self):
+        ascii = curses.ascii.ascii
+        self.assertEqual(ascii('\xc1'), 'A')
+        self.assertEqual(ascii('A'), 'A')
+        self.assertEqual(ascii(ord('\xc1')), ord('A'))
+
+    def test_ctrl(self):
+        ctrl = curses.ascii.ctrl
+        self.assertEqual(ctrl('J'), '\n')
+        self.assertEqual(ctrl('\n'), '\n')
+        self.assertEqual(ctrl('@'), '\0')
+        self.assertEqual(ctrl(ord('J')), ord('\n'))
+
+    def test_alt(self):
+        alt = curses.ascii.alt
+        self.assertEqual(alt('\n'), '\x8a')
+        self.assertEqual(alt('A'), '\xc1')
+        self.assertEqual(alt(ord('A')), 0xc1)
+
     def test_unctrl(self):
         unctrl = curses.ascii.unctrl
         self.assertEqual(unctrl('a'), 'a')
@@ -406,9 +456,13 @@ class TestAscii(unittest.TestCase):
         self.assertEqual(unctrl('\x7f'), '^?')
         self.assertEqual(unctrl('\n'), '^J')
         self.assertEqual(unctrl('\0'), '^@')
+        self.assertEqual(unctrl(ord('A')), 'A')
+        self.assertEqual(unctrl(ord('\n')), '^J')
         # Meta-bit characters
         self.assertEqual(unctrl('\x8a'), '!^J')
         self.assertEqual(unctrl('\xc1'), '!A')
+        self.assertEqual(unctrl(ord('\x8a')), '!^J')
+        self.assertEqual(unctrl(ord('\xc1')), '!A')
 
 
 if __name__ == '__main__':