iterable

I've got a large iterable, in fact, a large iterable given by: itertools.permutations(range(10)) I would like to access to the millionth element. I alredy have problem solved in some different ways. Casting iterable to list and getting 1000000th element: return list(permutations(range(10)))[999999] Manually skiping elements till 999999: p = permutations(range(10)) for i in xrange(999999): p.next() return p.next() Manually skiping elements v2: p = permutations(range(10)) for i, element in enumerate(p): if i == 999999: return element Using islice from itertools: return islice(permutations(range

First I want to clarify, I'm NOT asking what is "iterator". This is how the term "iterable" is defined in Python's doc : iterable An object capable of returning its members one at a time. Examples of iterables include all sequence types (such as list, str, and tuple) and some non-sequence types like dict, file objects, and objects of any classes you define with an __iter__() or __getitem__() method. Iterables can be used in a for loop and in many other places where a sequence is needed (zip(), map(), ...). When an iterable object is passed as an argument to the built-in function iter(), it

I have a file "test.txt": this is 1st line this is 2nd line this is 3rd line the following code lines = open("test.txt", 'r') for line in lines: print "loop 1:"+line for line in lines: print "loop 2:"+line only prints: loop 1:this is 1st line loop 1:this is 2nd line loop 1:this is 3rd line It doesn't print loop2 at all. Two questions: the file object returned by open(), is it an iterable? that's why it can be used in a for loop? why loop2 doesn't get printed at all? It is not only an iterable , it is an iterator , which is why it can only traverse the file once. You may reset the file cursor

This is my class public class csWordSimilarity { public int irColumn1 = 0; public int irColumn2 = 0; public int irColumn3 = 0; public int irColumn4 = 0; public int irColumn5 = 0; } I want to make that class iterable to be used like the way below foreach (int irVal in myVarWordSimilarity) { } myVarWordSimilarity is csWordSimilarity type. So I want to iterate all public int variables. How do I need to modify csWordSimilarity class for making it iterable like the way above. edvaldig You can implement IEnumerable and have the GetEnumerator override return an "iterator" over the variables using the

I am trying to understand Java Iterator and Iterable interfaces I am writing this class class MyClass implements Iterable<String> { public String[] a = null; public MyClass(String[] arr) { a = arr; } public MyClassIterator iterator() { return new MyClassIterator(this); } public class MyClassIterator implements Iterator<String> { private MyClass myclass = null; private int count = 0; public MyClassIterator(MyClass m) { myclass = m; } public boolean hasNext() { return count < myclass.a.length; } public String next() { int t = count; count++; return myclass.a[t]; } public void remove() { throw

Possible Duplicate: LINQ analogues in Scala I am looking for chart which shows equivalents in Scala of LINQ methods for IEnumerable: First is head Select is map SingleOrDefault is ... (I don't know) ... and so on Does anyone know anything of such "translate" table? missingfaktor I am only listing out the equivalents of functions from Enumerable<A> . This is incomplete as of now. I will try to update this later with more. xs.Aggregate(accumFunc) -> xs.reduceLeft(accumFunc) xs.Aggregate(seed, accumFunc) -> xs.foldLeft(seed)(accumFunc) xs.Aggregate(seed, accumFunc, trans) -> trans(xs.foldLeft