On Sun, 21 Oct 2012 17:40:41 -0700, David wrote: > If I have one "yield" in function, the function will become generator,
Almost correct. The function becomes a *generator function*, that is, a function that returns a generator object. Sometimes people abbreviate that to "generator", but that is ambiguous -- the term "generator" can mean either the function which includes yield in it, or the object that is returned. > and it can only be called in the form like "for item in function()" or > "function.next()", and call the function directly will raise error, is > it right? You can call the function directly, and it will return an generator object. You don't have to iterate over that generator object, although you normally will. Example: py> def test(): ... yield 42 ... py> test <function test at 0xb7425764> py> type(test) <type 'function'> py> x = test() py> x <generator object test at 0xb71d4874> py> type(x) <type 'generator'> -- Steven -- http://mail.python.org/mailman/listinfo/python-list
