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Iterators phase 1. This comprises:

Browse source 
new slot tp_iter in type object, plus new flag Py_TPFLAGS_HAVE_ITER
new C API PyObject_GetIter(), calls tp_iter
new builtin iter(), with two forms: iter(obj), and iter(function, sentinel)
new internal object types iterobject and calliterobject
new exception StopIteration
new opcodes for "for" loops, GET_ITER and FOR_ITER (also supported by dis.py)
new magic number for .pyc files
new special method for instances: __iter__() returns an iterator
iteration over dictionaries: "for x in dict" iterates over the keys
iteration over files: "for x in file" iterates over lines

TODO:

documentation
test suite
decide whether to use a different way to spell iter(function, sentinal)
decide whether "for key in dict" is a good idea
use iterators in map/filter/reduce, min/max, and elsewhere (in/not in?)
speed tuning (make next() a slot tp_next???)
This commit is contained in:
Guido van Rossum 2001-04-20 19:13:02 +00:00
parent 12e73bb2f0
commit 59d1d2b434
16 changed files with 256 additions and 25 deletions
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17
Objects/abstract.c
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@ -1738,3 +1738,20 @@ PyObject_IsSubclass(PyObject *derived, PyObject *cls)
return retval;
}
PyObject *
PyObject_GetIter(PyObject *o)
{
PyTypeObject *t = o->ob_type;
getiterfunc f = NULL;
if (PyType_HasFeature(t, Py_TPFLAGS_HAVE_ITER))
f = t->tp_iter;
if (f == NULL) {
if (PySequence_Check(o))
return PyIter_New(o);
PyErr_SetString(PyExc_TypeError, "iter() of non-sequence");
return NULL;
}
else
return (*f)(o);
}