Mercurial > cpython-lru_cache-weakref
diff Python/compile.c @ 17597:32e7d0898eab legacy-trunk
Iterators phase 1. This comprises:
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???)
| author | Guido van Rossum <guido@python.org> |
|---|---|
| date | Fri, 20 Apr 2001 19:13:02 +0000 |
| parents | f939ce52a734 |
| children | 8ff76cf30a8c |
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--- a/Python/compile.c Fri Apr 20 19:04:55 2001 +0000 +++ b/Python/compile.c Fri Apr 20 19:13:02 2001 +0000 @@ -1232,21 +1232,15 @@ static void com_list_for(struct compiling *c, node *n, node *e, char *t) { - PyObject *v; int anchor = 0; int save_begin = c->c_begin; /* list_iter: for v in expr [list_iter] */ com_node(c, CHILD(n, 3)); /* expr */ - v = PyInt_FromLong(0L); - if (v == NULL) - c->c_errors++; - com_addoparg(c, LOAD_CONST, com_addconst(c, v)); - com_push(c, 1); - Py_XDECREF(v); + com_addbyte(c, GET_ITER); c->c_begin = c->c_nexti; com_addoparg(c, SET_LINENO, n->n_lineno); - com_addfwref(c, FOR_LOOP, &anchor); + com_addfwref(c, FOR_ITER, &anchor); com_push(c, 1); com_assign(c, CHILD(n, 1), OP_ASSIGN, NULL); c->c_loops++; @@ -1255,7 +1249,7 @@ com_addoparg(c, JUMP_ABSOLUTE, c->c_begin); c->c_begin = save_begin; com_backpatch(c, anchor); - com_pop(c, 2); /* FOR_LOOP has popped these */ + com_pop(c, 1); /* FOR_ITER has popped this */ } static void @@ -2873,7 +2867,6 @@ static void com_for_stmt(struct compiling *c, node *n) { - PyObject *v; int break_anchor = 0; int anchor = 0; int save_begin = c->c_begin; @@ -2882,15 +2875,10 @@ com_addfwref(c, SETUP_LOOP, &break_anchor); block_push(c, SETUP_LOOP); com_node(c, CHILD(n, 3)); - v = PyInt_FromLong(0L); - if (v == NULL) - c->c_errors++; - com_addoparg(c, LOAD_CONST, com_addconst(c, v)); - com_push(c, 1); - Py_XDECREF(v); + com_addbyte(c, GET_ITER); c->c_begin = c->c_nexti; com_addoparg(c, SET_LINENO, n->n_lineno); - com_addfwref(c, FOR_LOOP, &anchor); + com_addfwref(c, FOR_ITER, &anchor); com_push(c, 1); com_assign(c, CHILD(n, 1), OP_ASSIGN, NULL); c->c_loops++; @@ -2899,7 +2887,7 @@ com_addoparg(c, JUMP_ABSOLUTE, c->c_begin); c->c_begin = save_begin; com_backpatch(c, anchor); - com_pop(c, 2); /* FOR_LOOP has popped these */ + com_pop(c, 1); /* FOR_ITER has popped this */ com_addbyte(c, POP_BLOCK); block_pop(c, SETUP_LOOP); if (NCH(n) > 8)