range

问题 The title is pretty much self-explanatory: When should one use the double-dots .. and when the triple-dots ... ? Both are used to indicate a range. 回答1: While ranges with double dots don't include the end bound, triple dots were used for inclusive ranges, i.e. (0...2) would contain 2 as well. This is now obsolete; use ..= for this purpose instead. 来源： https://stackoverflow.com/questions/53610214/what-is-the-difference-between-and

问题 I was wondering if it is possible to check if a string value is contained in a column given that the column contains the start and end values. For example: if the table has a column NR with the following rows: 400-500 45-76,23-25 12,14-19,21 I want to find the row which has the value 421 in it. So the answer should be the first row. Is this possible in mysql? 回答1: You should have two tables: one for columns, one for column ranges. With that, a simple query will retrieve what you need. CREATE

问题 I'm using redis-py and want to use -inf and inf with ZRANGEBYSCORE. I tried to do this using string and float of inf but those return an empty set. How can I do this? EDIT I tried doing the following command: redis.StrictRedis.ZRANGEBYSCORE("SORTEDSET", "-inf", "inf") or redis.StrictRedis.ZRANGEBYSCORE("SORTEDSET", float("-inf"), float("inf")) UPDATE My error was that my abstraction for zrangebyscore was using zrange by mistake...inf works as stated below. 回答1: This is my code has been tested

问题 I would like to write a function module that returns a range table. Is that possible and if so, how? 回答1: The structure of a typed range is like this : **Name** **Type** SIGNT VARV_SIGN OPTION TVARV_OPTI LOW your-type HIGH your-type You can create this structure in the dictionary, as well as a table of those, and then use it in the FM signature. Also, a generic structure already exists : RSDSSELOPT (along with a table type RSELOPTION ). 来源： https://stackoverflow.com/questions/3702429

问题 This is my first question here as I'm fairly new to this world! I've spent a few days trying to figure this out for myself, but haven't so far been able to find any useful info. I'm trying to retrieve a byte range from a file stored in S3, using something like: S3Key.get_contents_to_file(tempfile, headers={'Range': 'bytes=0-100000'} The file that I'm trying to restore from is a video file, specifically an MXF. When I request a byte range, I get back more info in the tempfile than requested.

问题 I have seen other posts addressing similar problem. I know how to generate N positive integers. I also know how to restrict the sum of randomly generated integers. The only problem is satisfying the condition that none of the N values fall out of the specified range. e.g. generate_ints(n, total, low, high) should generate n value array such that each value is between low and high and the sum adds up to the total. Any pointers/ help would be greatly appreciated. e.g. generate_ints(4, 40, 4, 15

问题 let me explain the situation first - let's say i have 4 dates: BS, BE, PS, PE (S for start, E for end). I need to know how many days are over lapping when given those dates. for example : BE-05.01 , BS-10.01, PS-03.01, PE-07.01 the result is: 3 (05.01, 06.01 and 07.01 are overlapping) I wrote the following code but it seems to messy and i want to check if maybe there is a simpler way to do this: private static double GetNumOfOverLappingDays(DateTime BS, DateTime BE, DateTime PS, DateTime PE)

问题 According to the Scala documentation for the method Range.end , it returns "the exclusive end of the range." So why does it return the same value for both the to and the until notations? For example: Welcome to Scala version 2.9.2 (Java HotSpot(TM) Server VM, Java 1.7.0). Type in expressions to have them evaluated. Type :help for more information. scala> (1 to 10).end res0: Int = 10 scala> (1 until 10).end res1: Int = 10 Shouldn't res0 == 11 ? 回答1: to and until result in related but different

问题 I am quite new to VBA, Today developing a macro I noticed something funny. Using Range like this is working : Dim rg As Range Set rg = ActiveSheet.Range("A1:B2") Using Range like this does not work and result in error "Object variable not set" : Dim rg As Range rg = ActiveSheet.Range("A1:B2") but using Range like this is working : Dim rg,rg2 As Range rg = ActiveSheet.Range("A1:B2") How is it possible? 回答1: You are discovering Variant and object references. A Range is an object - a Variant can

问题 In Objective-C Cocoa we have the NSIndexSet class which stores a series of unique indexes efficiently by keeping an array of ranges. E.g. the set 1, 2, ... 30, 57 would be stored as the ranges 1-30 and 57 rather than an array of 32 numbers. This facilitates huge selections to be stored in a simple and fast way. For example, if all rows between 1 and a million in a table selected, the index set collapses to just a tiny range and is fast to compare and intersect with. Unfortunately this turns