increment

I recently started learning Python, and the concept of for loops is still a little confusing for me. I understand that it generally follows the format for x in y , where y is just some list. The for-each loop for (int n: someArray) becomes for n in someArray , And the for loop for (i = 0; i < 9; i-=2) can be represented by for i in range(0, 9, -2) Suppose instead of a constant increment, I wanted i*=2 , or even i*=i . Is this possible, or would I have to use a while loop instead? As you say, a for loop iterates through the elements of a list. The list can contain anything you like, so you can

I have a number (e.g. 6) that is dynamically generated and I would like to fill an array with the numbers 1 through the dynamically generated number (in this example, 6): array(1, 2, 3, 4, 5, 6); The only way I know to do this at the moment is by using a for loop, but I'm wondering if there's a better way, something similar to array_fill . I looked at array_fill, but it doesn't look like it will take a number and increment it for a set number of times. Use range : $arr = range(1,6); // Returns an array of elements from start to limit, inclusive. This is what you are looking for: range(1, 6) 来源

I have an application that has a guid variable which needs to be unique (of course). I know that statistically any guid should just be assumed to be unique, but due to dev/test environment reasons, the same value may be seen multiple times. So when that happens, I want to "increment" the value of the Guid, rather than just creating a whole new one. There does not seem to be a simple way to do this. I found a hack, which I will post as a possible answer, but want a cleaner solution. You can get the byte components of the guid, so you can just work on that: static class GuidExtensions { private

I am struggling with incrementing a number property value of an item already saved in my table on DynamoDB my code currently is: AWSDynamoDBUpdateItemInput *updateItemInput = [AWSDynamoDBUpdateItemInput new]; updateItemInput.tableName = @"Table"; updateItemInput.key= @{ @"KeyPropertyName":@"KeyValue" }; updateItemInput.updateExpression = @"SET(counter = counter + :val)"; updateItemInput.expressionAttributeValues =@{ @":val":@1 }; AWSDynamoDB *dynamoDB = [AWSDynamoDB defaultDynamoDB]; [[dynamoDB updateItem:updateItemInput] continueWithBlock:^id(AWSTask *task) { if (task.error) { NSLog(@"The

Confusion with ++ and -- operator int a = 10; printf("%d\n", -(--a) ); // valid output: -9 But, problem occurs when following is used: printf("%d\n", --(-a)); // error, invalid Why? The ++ and -- operator works on only lvalue, not value. An lvalue is something that can stand on the left side of an assignment. printf("%d\n", -(--a) ); Here, -- operator works on variable a , so this is valid. But, printf("%d\n", --(-a)); Here, (-a) returns a value. -- is applied to a value, which is not valid. This is because -- modifies a variable, and int value can't be modified (For example you can't do 7 = 5

I'm trying to get a setup going that will increment a class from 1 through 12 and set a background color based on a variable list (also of 12 variables). I am close, but not getting what I'd hoped. This is my first foray into control directives in SASS, so please forgive my ignorance. Currently, I'm getting the class incremented successfully. It's the part of choosing the incremented variable that I am missing out on. @mixin colors { $colors: $orange, $blue, $lightBlue, $teal, $lightTeal, $green, $lightGreen, $darkOrange, $orange, $lightOrange, $yellow, $lightYellow; @each $color in $colors {

i want to increase mongodb document number automatically using loopback. I made function in mongo function getNextSequence(name) { var ret = db.counters.findAndModify( { query: { _id: name }, update: { $inc: { seq: 1 } }, new: true } ); return ret.seq; } db.tweet.insert( { "_id" : getNextSequence("userid"), "content": "test", "date": "1", "ownerUsername": "1", "ownerId": "1" } ) It is working in mongo shell. However when I insert using loopback.js browser ( http://localhost:3000/explorer/ ), It is not working. 400 error(SytaxError) code is showing. I can not use mongo function in loopback rest

I have a table consisting of groups of, for example, five rows each. Each row in each group possesses a date value unique to that group. What I want to do in my query, is go through the table, and increment a user variable (@count) when this date value changes. That's to say, @count should equal the group count, rather than the row count. My current query looks like this, in case you're wondering: SELECT @row := @row +1 AS rownum, date FROM ( SELECT @row := 0 ) r, stats Thanks a lot. What about something like this? SELECT (CASE WHEN @date <> date THEN @row := @row +1 ELSE @row END) AS rownum,