Mercurial > cpython-lru_cache-weakref

diff Python/bltinmodule.c @ 6145:341fcb7bad90 legacy-trunk

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Two new built-in functions: issubclass() and isinstance(). Both take classes as their second arguments. The former takes a class as the first argument and returns true iff first is second, or is a subclass of second. The latter takes any object as the first argument and returns true iff first is an instance of the second, or any subclass of second. Also, change all occurances of pointer compares against PyExc_IndexError with PyErr_ExceptionMatches() calls.
author Barry Warsaw <barry@python.org>
date Fri, 22 Aug 1997 21:14:38 +0000
parents 8d2194e22e67
children c43ca8dd0081
line wrap: on
line diff
--- a/Python/bltinmodule.c	Fri Aug 22 20:56:07 1997 +0000
+++ b/Python/bltinmodule.c	Fri Aug 22 21:14:38 1997 +0000
@@ -169,7 +169,7 @@
 		if ((item = (*sqf->sq_item)(seq, i)) == NULL) {
 			if (i < len)
 				goto Fail_1;
-			if (PyErr_Occurred() == PyExc_IndexError) {
+			if (PyErr_ExceptionMatches(PyExc_IndexError)) {
 				PyErr_Clear();
 				break;
 			}
@@ -726,8 +726,9 @@
 				if (item == NULL) {
 					if (i < sqp->len)
 						goto Fail_0;
-					if (PyErr_Occurred() ==
-					    PyExc_IndexError) {
+					if (PyErr_ExceptionMatches(
+						PyExc_IndexError))
+					{
 						PyErr_Clear();
 						Py_INCREF(Py_None);
 						item = Py_None;
@@ -1067,7 +1068,7 @@
 	for (i = 0; ; i++) {
 		x = (*sq->sq_item)(v, i); /* Implies INCREF */
 		if (x == NULL) {
-			if (PyErr_Occurred() == PyExc_IndexError) {
+			if (PyErr_ExceptionMatches(PyExc_IndexError)) {
 				PyErr_Clear();
 				break;
 			}
@@ -1415,7 +1416,7 @@
 		}
 
 		if ((op2 = (*sqf->sq_item)(seq, i)) == NULL) {
-			if (PyErr_Occurred() == PyExc_IndexError) {
+			if (PyErr_ExceptionMatches(PyExc_IndexError)) {
 				PyErr_Clear();
 				break;
 			}
@@ -1613,6 +1614,57 @@
 	return d;
 }
 
+static PyObject *
+builtin_isinstance(self, args)
+     PyObject *self;
+     PyObject *args;
+{
+	PyObject *inst;
+	PyObject *cls;
+	int retval;
+
+	if (!PyArg_ParseTuple(args, "OO", &inst, &cls))
+		return NULL;
+	if (!PyClass_Check(cls)) {
+		PyErr_SetString(PyExc_TypeError,
+				"second argument must be a class");
+		return NULL;
+	}
+
+	if (!PyInstance_Check(inst))
+		retval = 0;
+	else {
+		PyObject *inclass =
+			(PyObject*)((PyInstanceObject*)inst)->in_class;
+		retval = PyClass_IsSubclass(inclass, cls);
+	}
+	return PyInt_FromLong(retval);
+}
+
+
+static PyObject *
+builtin_issubclass(self, args)
+     PyObject *self;
+     PyObject *args;
+{
+	PyObject *derived;
+	PyObject *cls;
+	int retval;
+
+	if (!PyArg_ParseTuple(args, "OO", &derived, &cls))
+		return NULL;
+	if (!PyClass_Check(derived) || !PyClass_Check(cls)) {
+		PyErr_SetString(PyExc_TypeError, "arguments must be classes");
+		return NULL;
+	}
+	/* shortcut */
+	if (!(retval = (derived == cls)))
+		retval = PyClass_IsSubclass(derived, cls);
+
+	return PyInt_FromLong(retval);
+}
+
+
 static PyMethodDef builtin_methods[] = {
 	{"__import__",	builtin___import__, 1},
 	{"abs",		builtin_abs, 1},
@@ -1641,6 +1693,8 @@
 	{"input",	builtin_input, 1},
 	{"intern",	builtin_intern, 1},
 	{"int",		builtin_int, 1},
+	{"isinstance",  builtin_isinstance, 1},
+	{"issubclass",  builtin_issubclass, 1},
 	{"len",		builtin_len, 1},
 	{"list",	builtin_list, 1},
 	{"locals",	builtin_locals, 1},