diff options
| -rw-r--r-- | Doc/library/operator.rst | 47 | ||||
| -rw-r--r-- | Modules/operator.c | 14 |
2 files changed, 40 insertions, 21 deletions
diff --git a/Doc/library/operator.rst b/Doc/library/operator.rst index 3860880..de7a542 100644 --- a/Doc/library/operator.rst +++ b/Doc/library/operator.rst @@ -241,13 +241,22 @@ lookups. These are useful for making fast field extractors as arguments for expect a function argument. -.. function:: attrgetter(attr[, args...]) +.. function:: attrgetter(attr) + attrgetter(*attrs) - Return a callable object that fetches *attr* from its operand. If more than one - attribute is requested, returns a tuple of attributes. After, - ``f = attrgetter('name')``, the call ``f(b)`` returns ``b.name``. After, - ``f = attrgetter('name', 'date')``, the call ``f(b)`` returns ``(b.name, - b.date)``. Equivalent to:: + Return a callable object that fetches *attr* from its operand. + If more than one attribute is requested, returns a tuple of attributes. + The attribute names can also contain dots. For example: + + * After ``f = attrgetter('name')``, the call ``f(b)`` returns ``b.name``. + + * After ``f = attrgetter('name', 'date')``, the call ``f(b)`` returns + ``(b.name, b.date)``. + + * After ``f = attrgetter('name.first', 'name.last')``, the call ``f(b)`` + returns ``(r.name.first, r.name.last)``. + + Equivalent to:: def attrgetter(*items): if any(not isinstance(item, str) for item in items): @@ -267,14 +276,19 @@ expect a function argument. return obj - The attribute names can also contain dots; after ``f = attrgetter('date.month')``, - the call ``f(b)`` returns ``b.date.month``. - -.. function:: itemgetter(item[, args...]) +.. function:: itemgetter(item) + itemgetter(*items) Return a callable object that fetches *item* from its operand using the operand's :meth:`__getitem__` method. If multiple items are specified, - returns a tuple of lookup values. Equivalent to:: + returns a tuple of lookup values. For example: + + * After ``f = itemgetter(2)``, the call ``f(r)`` returns ``r[2]``. + + * After ``g = itemgetter(2, 5, 3)``, the call ``g(r)`` returns + ``(r[2], r[5], r[3])``. + + Equivalent to:: def itemgetter(*items): if len(items) == 1: @@ -313,9 +327,14 @@ expect a function argument. Return a callable object that calls the method *name* on its operand. If additional arguments and/or keyword arguments are given, they will be given - to the method as well. After ``f = methodcaller('name')``, the call ``f(b)`` - returns ``b.name()``. After ``f = methodcaller('name', 'foo', bar=1)``, the - call ``f(b)`` returns ``b.name('foo', bar=1)``. Equivalent to:: + to the method as well. For example: + + * After ``f = methodcaller('name')``, the call ``f(b)`` returns ``b.name()``. + + * After ``f = methodcaller('name', 'foo', bar=1)``, the call ``f(b)`` + returns ``b.name('foo', bar=1)``. + + Equivalent to:: def methodcaller(name, *args, **kwargs): def caller(obj): diff --git a/Modules/operator.c b/Modules/operator.c index 12fdad5..5156b6b 100644 --- a/Modules/operator.c +++ b/Modules/operator.c @@ -460,8 +460,8 @@ PyDoc_STRVAR(itemgetter_doc, "itemgetter(item, ...) --> itemgetter object\n\ \n\ Return a callable object that fetches the given item(s) from its operand.\n\ -After, f=itemgetter(2), the call f(r) returns r[2].\n\ -After, g=itemgetter(2,5,3), the call g(r) returns (r[2], r[5], r[3])"); +After f = itemgetter(2), the call f(r) returns r[2].\n\ +After g = itemgetter(2, 5, 3), the call g(r) returns (r[2], r[5], r[3])"); static PyTypeObject itemgetter_type = { PyVarObject_HEAD_INIT(NULL, 0) @@ -712,9 +712,9 @@ PyDoc_STRVAR(attrgetter_doc, "attrgetter(attr, ...) --> attrgetter object\n\ \n\ Return a callable object that fetches the given attribute(s) from its operand.\n\ -After, f=attrgetter('name'), the call f(r) returns r.name.\n\ -After, g=attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).\n\ -After, h=attrgetter('name.first', 'name.last'), the call h(r) returns\n\ +After f = attrgetter('name'), the call f(r) returns r.name.\n\ +After g = attrgetter('name', 'date'), the call g(r) returns (r.name, r.date).\n\ +After h = attrgetter('name.first', 'name.last'), the call h(r) returns\n\ (r.name.first, r.name.last)."); static PyTypeObject attrgetter_type = { @@ -844,8 +844,8 @@ PyDoc_STRVAR(methodcaller_doc, "methodcaller(name, ...) --> methodcaller object\n\ \n\ Return a callable object that calls the given method on its operand.\n\ -After, f = methodcaller('name'), the call f(r) returns r.name().\n\ -After, g = methodcaller('name', 'date', foo=1), the call g(r) returns\n\ +After f = methodcaller('name'), the call f(r) returns r.name().\n\ +After g = methodcaller('name', 'date', foo=1), the call g(r) returns\n\ r.name('date', foo=1)."); static PyTypeObject methodcaller_type = { |