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Make isinstance() more permissive in what types of arguments it

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accepts. Clarify exception messages for isinstance() and
issubclass().  Closes bug #124106.
This commit is contained in:
Neil Schemenauer 2000-12-04 15:42:11 +00:00
parent 24342d96c5
commit cc343caf41
1 changed files with 9 additions and 17 deletions
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26
Python/bltinmodule.c
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@ -1995,7 +1995,7 @@ Without arguments, equivalent to locals().\n\
With an argument, equivalent to object.__dict__."; With an argument, equivalent to object.__dict__.";
static int static int
abstract_issubclass(PyObject *derived, PyObject *cls, char *err, int first) abstract_issubclass(PyObject *derived, PyObject *cls, int first)
{ {
static PyObject *__bases__ = NULL; static PyObject *__bases__ = NULL;
PyObject *bases; PyObject *bases;
@ -2012,7 +2012,8 @@ abstract_issubclass(PyObject *derived, PyObject *cls, char *err, int first)
bases = PyObject_GetAttr(cls, __bases__); bases = PyObject_GetAttr(cls, __bases__);
if (bases == NULL || !PyTuple_Check(bases)) { if (bases == NULL || !PyTuple_Check(bases)) {
Py_XDECREF(bases); Py_XDECREF(bases);
PyErr_SetString(PyExc_TypeError, err); PyErr_SetString(PyExc_TypeError,
"arg 2 must be a class or type");
return -1; return -1;
} }
Py_DECREF(bases); Py_DECREF(bases);
@ -2024,14 +2025,14 @@ abstract_issubclass(PyObject *derived, PyObject *cls, char *err, int first)
bases = PyObject_GetAttr(derived, __bases__); bases = PyObject_GetAttr(derived, __bases__);
if (bases == NULL || !PyTuple_Check(bases)) { if (bases == NULL || !PyTuple_Check(bases)) {
Py_XDECREF(bases); Py_XDECREF(bases);
PyErr_SetString(PyExc_TypeError, err); PyErr_SetString(PyExc_TypeError,
"arg 2 must be a class or type");
return -1; return -1;
} }
n = PyTuple_GET_SIZE(bases); n = PyTuple_GET_SIZE(bases);
for (i = 0; i < n; i++) { for (i = 0; i < n; i++) {
r = abstract_issubclass(PyTuple_GET_ITEM(bases, i), r = abstract_issubclass(PyTuple_GET_ITEM(bases, i), cls, 0);
cls, err, 0);
if (r != 0) if (r != 0)
break; break;
} }
@ -2071,25 +2072,17 @@ builtin_isinstance(PyObject *self, PyObject *args)
} }
icls = PyObject_GetAttr(inst, __class__); icls = PyObject_GetAttr(inst, __class__);
if (icls != NULL) { if (icls != NULL) {
retval = abstract_issubclass( retval = abstract_issubclass( icls, cls, 1);
icls, cls,
"isinstance() arg 2 must be a class",
1);
Py_DECREF(icls); Py_DECREF(icls);
if (retval < 0) if (retval < 0)
return NULL; return NULL;
} }
else { else {
PyErr_SetString(PyExc_TypeError, PyErr_SetString(PyExc_TypeError,
"isinstance() arg 2 must be a class"); "arg 2 must be a class or type");
return NULL; return NULL;
} }
} }
else {
PyErr_SetString(PyExc_TypeError,
"isinstance() arg 2 must be a class");
return NULL;
}
return PyInt_FromLong(retval); return PyInt_FromLong(retval);
} }
@ -2111,8 +2104,7 @@ builtin_issubclass(PyObject *self, PyObject *args)
return NULL; return NULL;
if (!PyClass_Check(derived) || !PyClass_Check(cls)) { if (!PyClass_Check(derived) || !PyClass_Check(cls)) {
retval = abstract_issubclass( retval = abstract_issubclass(derived, cls, 1);
derived, cls, "arguments must be classes", 1);
if (retval < 0) if (retval < 0)
return NULL; return NULL;
} }