I was wondering if there is a way to run map on something. The way map works is it takes an iterable and applies a function to each item in that iterable producing a list. Is there a way to have map modify the iterable object itself? ...
I want to filter all Relation Objects where (relation= following relation in a virtual community) the date one has initiated the following is in the past, related to the moment now. The following declaration seems to be wrong, as a bool object is not iterable. Is there another way to do that? d = Relations.objects.filter(date_follow < ...
Hi everybody, is this legal in python?. Seems to work ... Thanks # with these lines you not need global variables anymore if __name__ == '__main__': import __main__ as main else: main = __import__(os.path.basename(os.path.splitext(__file__))) var_in_main = 0 # now any var is a global var, you can access any var from every...
I want to write a function printAll(), which accepts only those elements that implement that implement Iterable so that I can iterate over them and print the elements. How do I do that? ...
I saw this thread: http://stackoverflow.com/questions/1243794/what-are-the-biggest-differences-between-scala-2-8-and-scala-2-7 It seems to cover some changes, but the first compile problems I've hit don't seem to be mentioned. Any suggestions? kinds of the type arguments (Iterable[Any] with (A with Int) => Any) do not conform to the...
Is there a good, succinct/built-in way to see if all the values in an iterable are zeros? Right now I am using all() with a little list comprehension, but (to me) it seems like there should be a more expressive method. I'd view this as somewhat equivalent to a memcmp() in C. values = (0, 0, 0, 0, 0) # Test if all items in values tuple...
I want a convenient way to generate an Iterable, given a initial object and a function to produce the next object from the current one, that consumes O(1) memory (i.e., it doesn't cache old results; if you want to iterate a second time, the function has to be applied again). It doesn't seem like there's library support for this. In Scal...
Hi. I need you to review my implementation of a Singly Linked List (SLL) please. The implementation should use generics and be able to use the enhanced for. The problem is that, when I do for (Number n : list) being list a MyLinkedList<Integer> or MyLinkedList<Double>, I get the error: "Type mismatch: cannot convert from element type O...
I would think that Iterator.copy() would be quite a handy function. You could implement iterator filters in a much better way. For example, the only reason in Googles Java Collection for the filter (and similar) functions to use UnmodifiableIterator (which is just an Iterator without remove) is because you cannot implement such a filter...
Hi, I wonder why the Collection.addAll() method only accepts other Collections but not Iterables. Why is that? Any similar method to do that for Iterables? ...
(Using Python 3.1) I know this question has been asked many times for the general question of testing if iterator is empty; obviously, there's no neat solution to that (I guess for a reason - an iterator doesn't really know if it's empty until it's asked to return its next value). I have a specific example, however, and was hoping I ca...
I called a getElements method which returns Iterable<Element>. I did this: List<Element> elements = (List<Element>) getElements(); This generates the error: java.lang.ClassCastException: com.utesy.Element$3 cannot be cast to java.util.List I thought a List was a type of Iterable? ...
In Python, what is the "one [...] obvious way" to add all items of an iterable to an extant set? ...