Modules/operator.c

   1
   2 #include "Python.h"
   3
   4 PyDoc_STRVAR(operator_doc,
   5 "Operator interface.\n\
   6 \n\
   7 This module exports a set of functions implemented in C corresponding\n\
   8 to the intrinsic operators of Python.  For example, operator.add(x, y)\n\
   9 is equivalent to the expression x+y.  The function names are those\n\
  10 used for special class methods; variants without leading and trailing\n\
  11 '__' are also provided for convenience.");
  12
  13 #define spam1(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
  14   return AOP(a1); }
  15
  16 #define spam2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  17   PyObject *a1, *a2; \
  18   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  19   return AOP(a1,a2); }
  20
  21 #define spamoi(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  22   PyObject *a1; int a2; \
  23   if(! PyArg_ParseTuple(a,"Oi:" #OP,&a1,&a2)) return NULL; \
  24   return AOP(a1,a2); }
  25
  26 #define spam2n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  27   PyObject *a1, *a2; \
  28   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  29   if(-1 == AOP(a1,a2)) return NULL; \
  30   Py_INCREF(Py_None); \
  31   return Py_None; }
  32
  33 #define spam3n(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  34   PyObject *a1, *a2, *a3; \
  35   if(! PyArg_UnpackTuple(a,#OP,3,3,&a1,&a2,&a3)) return NULL; \
  36   if(-1 == AOP(a1,a2,a3)) return NULL; \
  37   Py_INCREF(Py_None); \
  38   return Py_None; }
  39
  40 #define spami(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a1) { \
  41   long r; \
  42   if(-1 == (r=AOP(a1))) return NULL; \
  43   return PyBool_FromLong(r); }
  44
  45 #define spami2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  46   PyObject *a1, *a2; long r; \
  47   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  48   if(-1 == (r=AOP(a1,a2))) return NULL; \
  49   return PyInt_FromLong(r); }
  50
  51 #define spamn2(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  52   PyObject *a1, *a2; Py_ssize_t r; \
  53   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  54   if(-1 == (r=AOP(a1,a2))) return NULL; \
  55   return PyInt_FromSsize_t(r); }
  56
  57 #define spami2b(OP,AOP) static PyObject *OP(PyObject *s, PyObject *a) { \
  58   PyObject *a1, *a2; long r; \
  59   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  60   if(-1 == (r=AOP(a1,a2))) return NULL; \
  61   return PyBool_FromLong(r); }
  62
  63 #define spamrc(OP,A) static PyObject *OP(PyObject *s, PyObject *a) { \
  64   PyObject *a1, *a2; \
  65   if(! PyArg_UnpackTuple(a,#OP,2,2,&a1,&a2)) return NULL; \
  66   return PyObject_RichCompare(a1,a2,A); }
  67
  68 spami(isCallable       , PyCallable_Check)
  69 spami(isNumberType     , PyNumber_Check)
  70 spami(truth            , PyObject_IsTrue)
  71 spam2(op_add           , PyNumber_Add)
  72 spam2(op_sub           , PyNumber_Subtract)
  73 spam2(op_mul           , PyNumber_Multiply)
  74 spam2(op_div           , PyNumber_Divide)
  75 spam2(op_floordiv      , PyNumber_FloorDivide)
  76 spam2(op_truediv       , PyNumber_TrueDivide)
  77 spam2(op_mod           , PyNumber_Remainder)
  78 spam1(op_neg           , PyNumber_Negative)
  79 spam1(op_pos           , PyNumber_Positive)
  80 spam1(op_abs           , PyNumber_Absolute)
  81 spam1(op_inv           , PyNumber_Invert)
  82 spam1(op_invert        , PyNumber_Invert)
  83 spam2(op_lshift        , PyNumber_Lshift)
  84 spam2(op_rshift        , PyNumber_Rshift)
  85 spami(op_not_          , PyObject_Not)
  86 spam2(op_and_          , PyNumber_And)
  87 spam2(op_xor           , PyNumber_Xor)
  88 spam2(op_or_           , PyNumber_Or)
  89 spam2(op_iadd          , PyNumber_InPlaceAdd)
  90 spam2(op_isub          , PyNumber_InPlaceSubtract)
  91 spam2(op_imul          , PyNumber_InPlaceMultiply)
  92 spam2(op_idiv          , PyNumber_InPlaceDivide)
  93 spam2(op_ifloordiv     , PyNumber_InPlaceFloorDivide)
  94 spam2(op_itruediv      , PyNumber_InPlaceTrueDivide)
  95 spam2(op_imod          , PyNumber_InPlaceRemainder)
  96 spam2(op_ilshift       , PyNumber_InPlaceLshift)
  97 spam2(op_irshift       , PyNumber_InPlaceRshift)
  98 spam2(op_iand          , PyNumber_InPlaceAnd)
  99 spam2(op_ixor          , PyNumber_InPlaceXor)
 100 spam2(op_ior           , PyNumber_InPlaceOr)
 101 spami(isSequenceType   , PySequence_Check)
 102 spam2(op_concat        , PySequence_Concat)
 103 spamoi(op_repeat       , PySequence_Repeat)
 104 spam2(op_iconcat       , PySequence_InPlaceConcat)
 105 spamoi(op_irepeat      , PySequence_InPlaceRepeat)
 106 spami2b(op_contains     , PySequence_Contains)
 107 spami2b(sequenceIncludes, PySequence_Contains)
 108 spamn2(indexOf         , PySequence_Index)
 109 spamn2(countOf         , PySequence_Count)
 110 spami(isMappingType    , PyMapping_Check)
 111 spam2(op_getitem       , PyObject_GetItem)
 112 spam2n(op_delitem       , PyObject_DelItem)
 113 spam3n(op_setitem      , PyObject_SetItem)
 114 spamrc(op_lt           , Py_LT)
 115 spamrc(op_le           , Py_LE)
 116 spamrc(op_eq           , Py_EQ)
 117 spamrc(op_ne           , Py_NE)
 118 spamrc(op_gt           , Py_GT)
 119 spamrc(op_ge           , Py_GE)
 120
 121 static PyObject*
 122 op_pow(PyObject *s, PyObject *a)
 123 {
 124         PyObject *a1, *a2;
 125         if (PyArg_UnpackTuple(a,"pow", 2, 2, &a1, &a2))
 126                 return PyNumber_Power(a1, a2, Py_None);
 127         return NULL;
 128 }
 129
 130 static PyObject*
 131 op_ipow(PyObject *s, PyObject *a)
 132 {
 133         PyObject *a1, *a2;
 134         if (PyArg_UnpackTuple(a,"ipow", 2, 2, &a1, &a2))
 135                 return PyNumber_InPlacePower(a1, a2, Py_None);
 136         return NULL;
 137 }
 138
 139 static PyObject *
 140 op_index(PyObject *s, PyObject *a)
 141 {
 142         return PyNumber_Index(a);
 143 }
 144
 145 static PyObject*
 146 is_(PyObject *s, PyObject *a)
 147 {
 148         PyObject *a1, *a2, *result = NULL;
 149         if (PyArg_UnpackTuple(a,"is_", 2, 2, &a1, &a2)) {
 150                 result = (a1 == a2) ? Py_True : Py_False;
 151                 Py_INCREF(result);
 152         }
 153         return result;
 154 }
 155
 156 static PyObject*
 157 is_not(PyObject *s, PyObject *a)
 158 {
 159         PyObject *a1, *a2, *result = NULL;
 160         if (PyArg_UnpackTuple(a,"is_not", 2, 2, &a1, &a2)) {
 161                 result = (a1 != a2) ? Py_True : Py_False;
 162                 Py_INCREF(result);
 163         }
 164         return result;
 165 }
 166
 167 static PyObject*
 168 op_getslice(PyObject *s, PyObject *a)
 169 {
 170         PyObject *a1;
 171         int a2,a3;
 172
 173         if (!PyArg_ParseTuple(a,"Oii:getslice",&a1,&a2,&a3))
 174                 return NULL;
 175         return PySequence_GetSlice(a1,a2,a3);
 176 }
 177
 178 static PyObject*
 179 op_setslice(PyObject *s, PyObject *a)
 180 {
 181         PyObject *a1, *a4;
 182         int a2,a3;
 183
 184         if (!PyArg_ParseTuple(a,"OiiO:setslice",&a1,&a2,&a3,&a4))
 185                 return NULL;
 186
 187         if (-1 == PySequence_SetSlice(a1,a2,a3,a4))
 188                 return NULL;
 189
 190         Py_INCREF(Py_None);
 191         return Py_None;
 192 }
 193
 194 static PyObject*
 195 op_delslice(PyObject *s, PyObject *a)
 196 {
 197         PyObject *a1;
 198         int a2,a3;
 199
 200         if(! PyArg_ParseTuple(a,"Oii:delslice",&a1,&a2,&a3))
 201                 return NULL;
 202
 203         if (-1 == PySequence_DelSlice(a1,a2,a3))
 204                 return NULL;
 205
 206         Py_INCREF(Py_None);
 207         return Py_None;
 208 }
 209
 210 #undef spam1
 211 #undef spam2
 212 #undef spam1o
 213 #undef spam1o
 214 #define spam1(OP,DOC) {#OP, OP, METH_VARARGS, PyDoc_STR(DOC)},
 215 #define spam2(OP,ALTOP,DOC) {#OP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)}, \
 216                            {#ALTOP, op_##OP, METH_VARARGS, PyDoc_STR(DOC)},
 217 #define spam1o(OP,DOC) {#OP, OP, METH_O, PyDoc_STR(DOC)},
 218 #define spam2o(OP,ALTOP,DOC) {#OP, op_##OP, METH_O, PyDoc_STR(DOC)}, \
 219                            {#ALTOP, op_##OP, METH_O, PyDoc_STR(DOC)},
 220
 221 static struct PyMethodDef operator_methods[] = {
 222
 223 spam1o(isCallable,
 224  "isCallable(a) -- Same as callable(a).")
 225 spam1o(isNumberType,
 226  "isNumberType(a) -- Return True if a has a numeric type, False otherwise.")
 227 spam1o(isSequenceType,
 228  "isSequenceType(a) -- Return True if a has a sequence type, False otherwise.")
 229 spam1o(truth,
 230  "truth(a) -- Return True if a is true, False otherwise.")
 231 spam2(contains,__contains__,
 232  "contains(a, b) -- Same as b in a (note reversed operands).")
 233 spam1(sequenceIncludes,
 234  "sequenceIncludes(a, b) -- Same as b in a (note reversed operands; deprecated).")
 235 spam1(indexOf,
 236  "indexOf(a, b) -- Return the first index of b in a.")
 237 spam1(countOf,
 238  "countOf(a, b) -- Return the number of times b occurs in a.")
 239 spam1o(isMappingType,
 240  "isMappingType(a) -- Return True if a has a mapping type, False otherwise.")
 241
 242 spam1(is_, "is_(a, b) -- Same as a is b.")
 243 spam1(is_not, "is_not(a, b) -- Same as a is not b.")
 244 spam2o(index, __index__, "index(a) -- Same as a.__index__()")
 245 spam2(add,__add__, "add(a, b) -- Same as a + b.")
 246 spam2(sub,__sub__, "sub(a, b) -- Same as a - b.")
 247 spam2(mul,__mul__, "mul(a, b) -- Same as a * b.")
 248 spam2(div,__div__, "div(a, b) -- Same as a / b when __future__.division is not in effect.")
 249 spam2(floordiv,__floordiv__, "floordiv(a, b) -- Same as a // b.")
 250 spam2(truediv,__truediv__, "truediv(a, b) -- Same as a / b when __future__.division is in effect.")
 251 spam2(mod,__mod__, "mod(a, b) -- Same as a % b.")
 252 spam2o(neg,__neg__, "neg(a) -- Same as -a.")
 253 spam2o(pos,__pos__, "pos(a) -- Same as +a.")
 254 spam2o(abs,__abs__, "abs(a) -- Same as abs(a).")
 255 spam2o(inv,__inv__, "inv(a) -- Same as ~a.")
 256 spam2o(invert,__invert__, "invert(a) -- Same as ~a.")
 257 spam2(lshift,__lshift__, "lshift(a, b) -- Same as a << b.")
 258 spam2(rshift,__rshift__, "rshift(a, b) -- Same as a >> b.")
 259 spam2o(not_,__not__, "not_(a) -- Same as not a.")
 260 spam2(and_,__and__, "and_(a, b) -- Same as a & b.")
 261 spam2(xor,__xor__, "xor(a, b) -- Same as a ^ b.")
 262 spam2(or_,__or__, "or_(a, b) -- Same as a | b.")
 263 spam2(iadd,__iadd__, "iadd(a, b) -- Same as a += b.")
 264 spam2(isub,__isub__, "isub(a, b) -- Same as a -= b.")
 265 spam2(imul,__imul__, "imul(a, b) -- Same as a *= b.")
 266 spam2(idiv,__idiv__, "idiv(a, b) -- Same as a /= b when __future__.division is not in effect.")
 267 spam2(ifloordiv,__ifloordiv__, "ifloordiv(a, b) -- Same as a //= b.")
 268 spam2(itruediv,__itruediv__, "itruediv(a, b) -- Same as a /= b when __future__.division is in effect.")
 269 spam2(imod,__imod__, "imod(a, b) -- Same as a %= b.")
 270 spam2(ilshift,__ilshift__, "ilshift(a, b) -- Same as a <<= b.")
 271 spam2(irshift,__irshift__, "irshift(a, b) -- Same as a >>= b.")
 272 spam2(iand,__iand__, "iand(a, b) -- Same as a &= b.")
 273 spam2(ixor,__ixor__, "ixor(a, b) -- Same as a ^= b.")
 274 spam2(ior,__ior__, "ior(a, b) -- Same as a |= b.")
 275 spam2(concat,__concat__,
 276  "concat(a, b) -- Same as a + b, for a and b sequences.")
 277 spam2(repeat,__repeat__,
 278  "repeat(a, b) -- Return a * b, where a is a sequence, and b is an integer.")
 279 spam2(iconcat,__iconcat__,
 280  "iconcat(a, b) -- Same as a += b, for a and b sequences.")
 281 spam2(irepeat,__irepeat__,
 282  "irepeat(a, b) -- Same as a *= b, where a is a sequence, and b is an integer.")
 283 spam2(getitem,__getitem__,
 284  "getitem(a, b) -- Same as a[b].")
 285 spam2(setitem,__setitem__,
 286  "setitem(a, b, c) -- Same as a[b] = c.")
 287 spam2(delitem,__delitem__,
 288  "delitem(a, b) -- Same as del a[b].")
 289 spam2(pow,__pow__, "pow(a, b) -- Same as a ** b.")
 290 spam2(ipow,__ipow__, "ipow(a, b) -- Same as a **= b.")
 291 spam2(getslice,__getslice__,
 292  "getslice(a, b, c) -- Same as a[b:c].")
 293 spam2(setslice,__setslice__,
 294 "setslice(a, b, c, d) -- Same as a[b:c] = d.")
 295 spam2(delslice,__delslice__,
 296 "delslice(a, b, c) -- Same as del a[b:c].")
 297 spam2(lt,__lt__, "lt(a, b) -- Same as a<b.")
 298 spam2(le,__le__, "le(a, b) -- Same as a<=b.")
 299 spam2(eq,__eq__, "eq(a, b) -- Same as a==b.")
 300 spam2(ne,__ne__, "ne(a, b) -- Same as a!=b.")
 301 spam2(gt,__gt__, "gt(a, b) -- Same as a>b.")
 302 spam2(ge,__ge__, "ge(a, b) -- Same as a>=b.")
 303
 304         {NULL,          NULL}           /* sentinel */
 305
 306 };
 307
 308 /* itemgetter object **********************************************************/
 309
 310 typedef struct {
 311         PyObject_HEAD
 312         Py_ssize_t nitems;
 313         PyObject *item;
 314 } itemgetterobject;
 315
 316 static PyTypeObject itemgetter_type;
 317
 318 static PyObject *
 319 itemgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 320 {
 321         itemgetterobject *ig;
 322         PyObject *item;
 323         Py_ssize_t nitems;
 324
 325         if (!_PyArg_NoKeywords("itemgetter()", kwds))
 326                 return NULL;
 327
 328         nitems = PyTuple_GET_SIZE(args);
 329         if (nitems <= 1) {
 330                 if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &item))
 331                         return NULL;
 332         } else
 333                 item = args;
 334
 335         /* create itemgetterobject structure */
 336         ig = PyObject_GC_New(itemgetterobject, &itemgetter_type);
 337         if (ig == NULL)
 338                 return NULL;
 339
 340         Py_INCREF(item);
 341         ig->item = item;
 342         ig->nitems = nitems;
 343
 344         PyObject_GC_Track(ig);
 345         return (PyObject *)ig;
 346 }
 347
 348 static void
 349 itemgetter_dealloc(itemgetterobject *ig)
 350 {
 351         PyObject_GC_UnTrack(ig);
 352         Py_XDECREF(ig->item);
 353         PyObject_GC_Del(ig);
 354 }
 355
 356 static int
 357 itemgetter_traverse(itemgetterobject *ig, visitproc visit, void *arg)
 358 {
 359         Py_VISIT(ig->item);
 360         return 0;
 361 }
 362
 363 static PyObject *
 364 itemgetter_call(itemgetterobject *ig, PyObject *args, PyObject *kw)
 365 {
 366         PyObject *obj, *result;
 367         Py_ssize_t i, nitems=ig->nitems;
 368
 369         if (!PyArg_UnpackTuple(args, "itemgetter", 1, 1, &obj))
 370                 return NULL;
 371         if (nitems == 1)
 372                 return PyObject_GetItem(obj, ig->item);
 373
 374         assert(PyTuple_Check(ig->item));
 375         assert(PyTuple_GET_SIZE(ig->item) == nitems);
 376
 377         result = PyTuple_New(nitems);
 378         if (result == NULL)
 379                 return NULL;
 380
 381         for (i=0 ; i < nitems ; i++) {
 382                 PyObject *item, *val;
 383                 item = PyTuple_GET_ITEM(ig->item, i);
 384                 val = PyObject_GetItem(obj, item);
 385                 if (val == NULL) {
 386                         Py_DECREF(result);
 387                         return NULL;
 388                 }
 389                 PyTuple_SET_ITEM(result, i, val);
 390         }
 391         return result;
 392 }
 393
 394 PyDoc_STRVAR(itemgetter_doc,
 395 "itemgetter(item, ...) --> itemgetter object\n\
 396 \n\
 397 Return a callable object that fetches the given item(s) from its operand.\n\
 398 After, f=itemgetter(2), the call f(r) returns r[2].\n\
 399 After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])");
 400
 401 static PyTypeObject itemgetter_type = {
 402         PyObject_HEAD_INIT(NULL)
 403         0,                              /* ob_size */
 404         "operator.itemgetter",          /* tp_name */
 405         sizeof(itemgetterobject),       /* tp_basicsize */
 406         0,                              /* tp_itemsize */
 407         /* methods */
 408         (destructor)itemgetter_dealloc, /* tp_dealloc */
 409         0,                              /* tp_print */
 410         0,                              /* tp_getattr */
 411         0,                              /* tp_setattr */
 412         0,                              /* tp_compare */
 413         0,                              /* tp_repr */
 414         0,                              /* tp_as_number */
 415         0,                              /* tp_as_sequence */
 416         0,                              /* tp_as_mapping */
 417         0,                              /* tp_hash */
 418         (ternaryfunc)itemgetter_call,   /* tp_call */
 419         0,                              /* tp_str */
 420         PyObject_GenericGetAttr,        /* tp_getattro */
 421         0,                              /* tp_setattro */
 422         0,                              /* tp_as_buffer */
 423         Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,        /* tp_flags */
 424         itemgetter_doc,                 /* tp_doc */
 425         (traverseproc)itemgetter_traverse,      /* tp_traverse */
 426         0,                              /* tp_clear */
 427         0,                              /* tp_richcompare */
 428         0,                              /* tp_weaklistoffset */
 429         0,                              /* tp_iter */
 430         0,                              /* tp_iternext */
 431         0,                              /* tp_methods */
 432         0,                              /* tp_members */
 433         0,                              /* tp_getset */
 434         0,                              /* tp_base */
 435         0,                              /* tp_dict */
 436         0,                              /* tp_descr_get */
 437         0,                              /* tp_descr_set */
 438         0,                              /* tp_dictoffset */
 439         0,                              /* tp_init */
 440         0,                              /* tp_alloc */
 441         itemgetter_new,                 /* tp_new */
 442         0,                              /* tp_free */
 443 };
 444
 445
 446 /* attrgetter object **********************************************************/
 447
 448 typedef struct {
 449         PyObject_HEAD
 450         Py_ssize_t nattrs;
 451         PyObject *attr;
 452 } attrgetterobject;
 453
 454 static PyTypeObject attrgetter_type;
 455
 456 static PyObject *
 457 attrgetter_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
 458 {
 459         attrgetterobject *ag;
 460         PyObject *attr;
 461         Py_ssize_t nattrs;
 462
 463         if (!_PyArg_NoKeywords("attrgetter()", kwds))
 464                 return NULL;
 465
 466         nattrs = PyTuple_GET_SIZE(args);
 467         if (nattrs <= 1) {
 468                 if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &attr))
 469                         return NULL;
 470         } else
 471                 attr = args;
 472
 473         /* create attrgetterobject structure */
 474         ag = PyObject_GC_New(attrgetterobject, &attrgetter_type);
 475         if (ag == NULL)
 476                 return NULL;
 477
 478         Py_INCREF(attr);
 479         ag->attr = attr;
 480         ag->nattrs = nattrs;
 481
 482         PyObject_GC_Track(ag);
 483         return (PyObject *)ag;
 484 }
 485
 486 static void
 487 attrgetter_dealloc(attrgetterobject *ag)
 488 {
 489         PyObject_GC_UnTrack(ag);
 490         Py_XDECREF(ag->attr);
 491         PyObject_GC_Del(ag);
 492 }
 493
 494 static int
 495 attrgetter_traverse(attrgetterobject *ag, visitproc visit, void *arg)
 496 {
 497         Py_VISIT(ag->attr);
 498         return 0;
 499 }
 500
 501 static PyObject *
 502 attrgetter_call(attrgetterobject *ag, PyObject *args, PyObject *kw)
 503 {
 504         PyObject *obj, *result;
 505         Py_ssize_t i, nattrs=ag->nattrs;
 506
 507         if (!PyArg_UnpackTuple(args, "attrgetter", 1, 1, &obj))
 508                 return NULL;
 509         if (ag->nattrs == 1)
 510                 return PyObject_GetAttr(obj, ag->attr);
 511
 512         assert(PyTuple_Check(ag->attr));
 513         assert(PyTuple_GET_SIZE(ag->attr) == nattrs);
 514
 515         result = PyTuple_New(nattrs);
 516         if (result == NULL)
 517                 return NULL;
 518
 519         for (i=0 ; i < nattrs ; i++) {
 520                 PyObject *attr, *val;
 521                 attr = PyTuple_GET_ITEM(ag->attr, i);
 522                 val = PyObject_GetAttr(obj, attr);
 523                 if (val == NULL) {
 524                         Py_DECREF(result);
 525                         return NULL;
 526                 }
 527                 PyTuple_SET_ITEM(result, i, val);
 528         }
 529         return result;
 530 }
 531
 532 PyDoc_STRVAR(attrgetter_doc,
 533 "attrgetter(attr, ...) --> attrgetter object\n\
 534 \n\
 535 Return a callable object that fetches the given attribute(s) from its operand.\n\
 536 After, f=attrgetter('name'), the call f(r) returns r.name.\n\
 537 After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).");
 538
 539 static PyTypeObject attrgetter_type = {
 540         PyObject_HEAD_INIT(NULL)
 541         0,                              /* ob_size */
 542         "operator.attrgetter",          /* tp_name */
 543         sizeof(attrgetterobject),       /* tp_basicsize */
 544         0,                              /* tp_itemsize */
 545         /* methods */
 546         (destructor)attrgetter_dealloc, /* tp_dealloc */
 547         0,                              /* tp_print */
 548         0,                              /* tp_getattr */
 549         0,                              /* tp_setattr */
 550         0,                              /* tp_compare */
 551         0,                              /* tp_repr */
 552         0,                              /* tp_as_number */
 553         0,                              /* tp_as_sequence */
 554         0,                              /* tp_as_mapping */
 555         0,                              /* tp_hash */
 556         (ternaryfunc)attrgetter_call,   /* tp_call */
 557         0,                              /* tp_str */
 558         PyObject_GenericGetAttr,        /* tp_getattro */
 559         0,                              /* tp_setattro */
 560         0,                              /* tp_as_buffer */
 561         Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,        /* tp_flags */
 562         attrgetter_doc,                 /* tp_doc */
 563         (traverseproc)attrgetter_traverse,      /* tp_traverse */
 564         0,                              /* tp_clear */
 565         0,                              /* tp_richcompare */
 566         0,                              /* tp_weaklistoffset */
 567         0,                              /* tp_iter */
 568         0,                              /* tp_iternext */
 569         0,                              /* tp_methods */
 570         0,                              /* tp_members */
 571         0,                              /* tp_getset */
 572         0,                              /* tp_base */
 573         0,                              /* tp_dict */
 574         0,                              /* tp_descr_get */
 575         0,                              /* tp_descr_set */
 576         0,                              /* tp_dictoffset */
 577         0,                              /* tp_init */
 578         0,                              /* tp_alloc */
 579         attrgetter_new,                 /* tp_new */
 580         0,                              /* tp_free */
 581 };
 582 /* Initialization function for the module (*must* be called initoperator) */
 583
 584 PyMODINIT_FUNC
 585 initoperator(void)
 586 {
 587         PyObject *m;
 588
 589         /* Create the module and add the functions */
 590         m = Py_InitModule4("operator", operator_methods, operator_doc,
 591                        (PyObject*)NULL, PYTHON_API_VERSION);
 592         if (m == NULL)
 593                 return;
 594
 595         if (PyType_Ready(&itemgetter_type) < 0)
 596                 return;
 597         Py_INCREF(&itemgetter_type);
 598         PyModule_AddObject(m, "itemgetter", (PyObject *)&itemgetter_type);
 599
 600         if (PyType_Ready(&attrgetter_type) < 0)
 601                 return;
 602         Py_INCREF(&attrgetter_type);
 603         PyModule_AddObject(m, "attrgetter", (PyObject *)&attrgetter_type);
 604 }