mirrors/cpython
0
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2024-11-30 13:24:13 +08:00
Code Issues Packages Projects Releases Wiki Activity

Two new built-in functions: issubclass() and isinstance(). Both take

Browse Source 
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.
This commit is contained in:
Barry Warsaw 1997-08-22 21:14:38 +00:00
parent 21c5c8fa5b
commit cde8b1ba0c
1 changed files with 59 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
Python/bltinmodule.c
View File

@ -169,7 +169,7 @@ builtin_filter(self, args)
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 @@ builtin_map(self, args)
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 @@ min_max(args, sign)
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 @@ builtin_reduce(self, args)
}
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 @@ builtin_vars(self, args)
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 @@ static PyMethodDef builtin_methods[] = {
{"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},