NSString *string = @”hello bla bla”; if ([string rangeOfString:@”bla”].location == NSNotFound) { NSLog(@”string does not contain bla”); } else { NSLog(@”string contains bla!”); } The key is noticing that rangeOfString: returns an NSRange struct, and the documentation says that it returns the struct {NSNotFound, 0} if the “haystack” does not contain the “needle”. And if … Read more
Stephan T. Lavavej(stl) from Microsoft did a talk at Going Native about how to use the new C++11 random functions and why not to use rand(). In it, he included a slide that basically solves your question. I’ve copied the code from that slide below. You can see his full talk here: #include <random> #include … Read more
For performance, especially when you’re iterating over a large range, xrange() is usually better. However, there are still a few cases why you might prefer range(): In python 3, range() does what xrange() used to do and xrange() does not exist. If you want to write code that will run on both Python 2 and … Read more
Because it’s more common to call range(0, 10) which returns [0,1,2,3,4,5,6,7,8,9] which contains 10 elements which equals len(range(0, 10)). Remember that programmers prefer 0-based indexing. Also, consider the following common code snippet: for i in range(len(li)): pass Could you see that if range() went up to exactly len(li) that this would be problematic? The programmer … Read more
My opinion is slightly different here. YES it is required. You can’t always control where the user may run the code from. Please consider these few test cases SCENARIO Workbook has 2 worksheets. Sheet1 and Sheet2 TEST 1 (Running from a module) Both Code give same result TEST 2 (Running from a Sheet code area … Read more
Try this: DROP PROCEDURE IF EXISTS filldates; DELIMITER | CREATE PROCEDURE filldates(dateStart DATE, dateEnd DATE) BEGIN WHILE dateStart <= dateEnd DO INSERT INTO tablename (_date) VALUES (dateStart); SET dateStart = date_add(dateStart, INTERVAL 1 DAY); END WHILE; END; | DELIMITER ; CALL filldates(‘2011-01-01′,’2011-12-31′); Here’s the SQL Fiddle to play with it: http://sqlfiddle.com/#!2/65d13/1 EDIT (to check if … Read more
In Python 2.x: range creates a list, so if you do range(1, 10000000) it creates a list in memory with 9999999 elements. xrange is a sequence object that evaluates lazily. In Python 3: range does the equivalent of Python 2’s xrange. To get the list, you have to explicitly use list(range(…)). xrange no longer exists.
EDIT 2: To answer the OP new requirement ranges = [] for key, group in groupby(enumerate(data), lambda (index, item): index – item): group = map(itemgetter(1), group) if len(group) > 1: ranges.append(xrange(group[0], group[-1])) else: ranges.append(group[0]) Output: [xrange(2, 5), xrange(12, 17), 20] You can replace xrange with range or any other custom class. Python docs have a … Read more
How to use a decimal range() step value?
The problem is that Cells is unqualified, which means that the sheet to which those cells refer is different depending on where your code is. Any time you call Range or Cells or Rows or UsedRange or anything that returns a Range object, and you don’t specify which sheet it’s on, the sheet gets assigned … Read more