Issue #5080: turn the DeprecationWarning from float arguments passed

to integer PyArg_Parse* format codes into a TypeError.  Add a
DeprecationWarning for floats passed with the 'L' format code, which
didn't previously have a warning.

Lib/os.py

@@ -752,7 +752,7 @@ if not _exists("urandom"):
             raise NotImplementedError("/dev/urandom (or equivalent) not found")
         try:
             bs = b""
-            while n - len(bs) >= 1:
+            while n > len(bs):
                 bs += read(_urandomfd, n - len(bs))
         finally:
             close(_urandomfd)

Lib/test/test_getargs2.py

 import unittest
 from test import test_support
 from _testcapi import getargs_keywords
-
 import warnings
-warnings.filterwarnings("ignore",
-                        category=DeprecationWarning,
-                        message=".*integer argument expected, got float",
-                        module=__name__)
-warnings.filterwarnings("ignore",
-                        category=DeprecationWarning,
-                        message=".*integer argument expected, got float",
-                        module="unittest")
 
 """
 > How about the following counterproposal. This also changes some of
@@ -68,7 +59,7 @@ class Unsigned_TestCase(unittest.TestCase):
     def test_b(self):
         from _testcapi import getargs_b
         # b returns 'unsigned char', and does range checking (0 ... UCHAR_MAX)
-        self.assertEqual(3, getargs_b(3.14))
+        self.assertRaises(TypeError, getargs_b, 3.14)
         self.assertEqual(99, getargs_b(Long()))
         self.assertEqual(99, getargs_b(Int()))
 
@@ -84,7 +75,7 @@ class Unsigned_TestCase(unittest.TestCase):
     def test_B(self):
         from _testcapi import getargs_B
         # B returns 'unsigned char', no range checking
-        self.assertEqual(3, getargs_B(3.14))
+        self.assertRaises(TypeError, getargs_B, 3.14)
         self.assertEqual(99, getargs_B(Long()))
         self.assertEqual(99, getargs_B(Int()))
 
@@ -101,7 +92,7 @@ class Unsigned_TestCase(unittest.TestCase):
     def test_H(self):
         from _testcapi import getargs_H
         # H returns 'unsigned short', no range checking
-        self.assertEqual(3, getargs_H(3.14))
+        self.assertRaises(TypeError, getargs_H, 3.14)
         self.assertEqual(99, getargs_H(Long()))
         self.assertEqual(99, getargs_H(Int()))
 
@@ -118,7 +109,7 @@ class Unsigned_TestCase(unittest.TestCase):
     def test_I(self):
         from _testcapi import getargs_I
         # I returns 'unsigned int', no range checking
-        self.assertEqual(3, getargs_I(3.14))
+        self.assertRaises(TypeError, getargs_I, 3.14)
         self.assertEqual(99, getargs_I(Long()))
         self.assertEqual(99, getargs_I(Int()))
 
@@ -154,7 +145,7 @@ class Signed_TestCase(unittest.TestCase):
     def test_h(self):
         from _testcapi import getargs_h
         # h returns 'short', and does range checking (SHRT_MIN ... SHRT_MAX)
-        self.assertEqual(3, getargs_h(3.14))
+        self.assertRaises(TypeError, getargs_h, 3.14)
         self.assertEqual(99, getargs_h(Long()))
         self.assertEqual(99, getargs_h(Int()))
 
@@ -170,7 +161,7 @@ class Signed_TestCase(unittest.TestCase):
     def test_i(self):
         from _testcapi import getargs_i
         # i returns 'int', and does range checking (INT_MIN ... INT_MAX)
-        self.assertEqual(3, getargs_i(3.14))
+        self.assertRaises(TypeError, getargs_i, 3.14)
         self.assertEqual(99, getargs_i(Long()))
         self.assertEqual(99, getargs_i(Int()))
 
@@ -186,7 +177,7 @@ class Signed_TestCase(unittest.TestCase):
     def test_l(self):
         from _testcapi import getargs_l
         # l returns 'long', and does range checking (LONG_MIN ... LONG_MAX)
-        self.assertEqual(3, getargs_l(3.14))
+        self.assertRaises(TypeError, getargs_l, 3.14)
         self.assertEqual(99, getargs_l(Long()))
         self.assertEqual(99, getargs_l(Int()))
 
@@ -203,7 +194,7 @@ class Signed_TestCase(unittest.TestCase):
         from _testcapi import getargs_n
         # n returns 'Py_ssize_t', and does range checking
         # (PY_SSIZE_T_MIN ... PY_SSIZE_T_MAX)
-        self.assertEqual(3, getargs_n(3.14))
+        self.assertRaises(TypeError, getargs_n, 3.14)
         self.assertEqual(99, getargs_n(Long()))
         self.assertEqual(99, getargs_n(Int()))
 
@@ -220,9 +211,24 @@ class Signed_TestCase(unittest.TestCase):
 class LongLong_TestCase(unittest.TestCase):
     def test_L(self):
         from _testcapi import getargs_L
-        # L returns 'long long', and does range checking (LLONG_MIN ... LLONG_MAX)
+        # L returns 'long long', and does range checking (LLONG_MIN
+        # ... LLONG_MAX)
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                "ignore",
+                category=DeprecationWarning,
+                message=".*integer argument expected, got float",
+                module=__name__)
+            self.assertEqual(3, getargs_L(3.14))
+        with warnings.catch_warnings():
+            warnings.filterwarnings(
+                "error",
+                category=DeprecationWarning,
+                message=".*integer argument expected, got float",
+                module="unittest")
+            self.assertRaises(DeprecationWarning, getargs_L, 3.14)
+
         self.assertRaises(TypeError, getargs_L, "Hello")
-        self.assertEqual(3, getargs_L(3.14))
         self.assertEqual(99, getargs_L(Long()))
         self.assertEqual(99, getargs_L(Int()))
 

Lib/test/test_os.py

@@ -502,11 +502,9 @@ class URandomTests (unittest.TestCase):
             self.assertEqual(len(os.urandom(100)), 100)
             self.assertEqual(len(os.urandom(1000)), 1000)
             # see http://bugs.python.org/issue3708
-            with test_support.check_warnings():
-                # silence deprecation warnings about float arguments
-                self.assertEqual(len(os.urandom(0.9)), 0)
-                self.assertEqual(len(os.urandom(1.1)), 1)
-                self.assertEqual(len(os.urandom(2.0)), 2)
+            self.assertRaises(TypeError, os.urandom, 0.9)
+            self.assertRaises(TypeError, os.urandom, 1.1)
+            self.assertRaises(TypeError, os.urandom, 2.0)
         except NotImplementedError:
             pass
 

Lib/test/test_xrange.py

@@ -81,7 +81,7 @@ class XrangeTest(unittest.TestCase):
         self.assertRaises(TypeError, xrange, 1, 2, 3, 4)
         self.assertRaises(ValueError, xrange, 1, 2, 0)
 
-        self.assertRaises(OverflowError, xrange, 1e100, 1e101, 1e101)
+        self.assertRaises(OverflowError, xrange, 10**100, 10**101, 10**101)
 
         self.assertRaises(TypeError, xrange, 0, "spam")
         self.assertRaises(TypeError, xrange, 0, 42, "spam")

Misc/NEWS

@@ -12,6 +12,14 @@ What's New in Python 2.7 alpha 2?
 Core and Builtins
 -----------------
 
+- Issue #5080: A number of functions and methods previously produced a
+  DeprecationWarning when passed a float argument where an integer was
+  expected.  These functions and methods now raise TypeError instead.
+  The majority of the effects of this change are in the extension
+  modules, but some core functions and methods are affected: notably
+  the 'chr', 'range' and 'xrange' builtins, and many unicode/str
+  methods.
+
 - Issue #7604: Deleting an unset slotted attribute did not raise an
   AttributeError.
 
@@ -88,6 +96,14 @@ Library
 C-API
 -----
 
+- Issue #5080: The argument parsing functions PyArg_ParseTuple,
+  PyArg_ParseTupleAndKeywords, PyArg_VaParse,
+  PyArg_VaParseTupleAndKeywords and PyArg_Parse no longer accept float
+  arguments for integer format codes (other than 'L'): previously an
+  attempt to pass a float resulted in a DeprecationWarning; now it
+  gives a TypeError.  For the 'L' format code (which previously had no
+  warning) there is now a DeprecationWarning.
+
 - Issue #7033: function ``PyErr_NewExceptionWithDoc()`` added.
 
 Build

Python/getargs.c

@@ -526,7 +526,7 @@ converterr(const char *expected, PyObject *arg, char *msgbuf, size_t bufsize)
 /* explicitly check for float arguments when integers are expected.  For now
  * signal a warning.  Returns true if an exception was raised. */
 static int
-float_argument_error(PyObject *arg)
+float_argument_warning(PyObject *arg)
 {
 	if (PyFloat_Check(arg) &&
 	    PyErr_Warn(PyExc_DeprecationWarning,
@@ -536,6 +536,20 @@ float_argument_error(PyObject *arg)
 		return 0;
 }
 
+/* explicitly check for float arguments when integers are expected.  Raises
+   TypeError and returns true for float arguments. */
+static int
+float_argument_error(PyObject *arg)
+{
+	if (PyFloat_Check(arg)) {
+		PyErr_SetString(PyExc_TypeError,
+				"integer argument expected, got float");
+		return 1;
+	}
+	else
+		return 0;
+}
+
 /* Convert a non-tuple argument.  Return NULL if conversion went OK,
    or a string with a message describing the failure.  The message is
    formatted as "must be <desired type>, not <actual type>".
@@ -719,7 +733,10 @@ convertsimple(PyObject *arg, const char **p_format, va_list *p_va, int flags,
 #ifdef HAVE_LONG_LONG
 	case 'L': {/* PY_LONG_LONG */
 		PY_LONG_LONG *p = va_arg( *p_va, PY_LONG_LONG * );
-		PY_LONG_LONG ival = PyLong_AsLongLong( arg );
+		PY_LONG_LONG ival;
+		if (float_argument_warning(arg))
+			return converterr("long<L>", arg, msgbuf, bufsize);
+		ival = PyLong_AsLongLong(arg);
 		if (ival == (PY_LONG_LONG)-1 && PyErr_Occurred() ) {
 			return converterr("long<L>", arg, msgbuf, bufsize);
 		} else {