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- A new type object, 'string', is added. This is a common base type

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for 'str' and 'unicode', and can be used instead of
  types.StringTypes, e.g. to test whether something is "a string":
  isinstance(x, string) is True for Unicode and 8-bit strings.  This
  is an abstract base class and cannot be instantiated directly.
This commit is contained in:
Guido van Rossum 2002-05-24 19:01:59 +00:00
parent 9ee4b94f51
commit cacfc07d08
6 changed files with 69 additions and 2 deletions
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56
Objects/stringobject.c
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@ -2855,6 +2855,60 @@ str_subtype_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
return pnew;
}
static PyObject *
basestring_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyErr_SetString(PyExc_TypeError,
"The string type cannot be instantiated");
return NULL;
}
static char basestring_doc[] =
"Type string cannot be instantiated; it is the base for str and unicode.";
PyTypeObject PyBaseString_Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"string",
0,
0,
0, /* tp_dealloc */
0, /* tp_print */
0, /* tp_getattr */
0, /* tp_setattr */
0, /* tp_compare */
0, /* tp_repr */
0, /* tp_as_number */
0, /* tp_as_sequence */
0, /* tp_as_mapping */
0, /* tp_hash */
0, /* tp_call */
0, /* tp_str */
0, /* tp_getattro */
0, /* tp_setattro */
0, /* tp_as_buffer */
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE, /* tp_flags */
basestring_doc, /* tp_doc */
0, /* tp_traverse */
0, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
0, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
&PyBaseObject_Type, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
0, /* tp_dictoffset */
0, /* tp_init */
0, /* tp_alloc */
basestring_new, /* tp_new */
0, /* tp_free */
};
static char string_doc[] =
"str(object) -> string\n\
\n\
@ -2893,7 +2947,7 @@ PyTypeObject PyString_Type = {
string_methods, /* tp_methods */
0, /* tp_members */
0, /* tp_getset */
0, /* tp_base */
&PyBaseString_Type, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */