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???)
diff --git a/Include/opcode.h b/Include/opcode.h
index 546ad08..0cace8e 100644
--- a/Include/opcode.h
+++ b/Include/opcode.h
@@ -53,6 +53,7 @@
#define BINARY_XOR 65
#define BINARY_OR 66
#define INPLACE_POWER 67
+#define GET_ITER 68
#define PRINT_EXPR 70
#define PRINT_ITEM 71
@@ -80,6 +81,7 @@
#define STORE_NAME 90 /* Index in name list */
#define DELETE_NAME 91 /* "" */
#define UNPACK_SEQUENCE 92 /* Number of sequence items */
+#define FOR_ITER 93
#define STORE_ATTR 95 /* Index in name list */
#define DELETE_ATTR 96 /* "" */