random-access

问题 Is there any way to have a random string in a django template ? I would like to have multiple strings displaying randomly like: {% here generate random number rnd ?%} {% if rnd == 1 %} {% trans "hello my name is john" %} {% endif %} {% if rnd == 2 %} {% trans "hello my name is bill" %} {% endif %} EDIT: Thanks for answer but my case needed something more specific as it was in the base template (wich I forgot to mention sorry ) . So after crawling google and some doc I fall on context

问题 Does node.js support writing random access? I see this package, but it doesn't work (if I write two or more parts, the file is corrupt) 回答1: fs core library should suffice for that. Here is the list of functions to use: fs.open(path, flags, [mode], callback) fs.write(fd, buffer, offset, length, position, callback) fs.writeSync(fd, buffer, offset, length, position) fs.read(fd, buffer, offset, length, position, callback) fs.readSync(fd, buffer, offset, length, position) They are analogous to

问题 Does node.js support writing random access? I see this package, but it doesn't work (if I write two or more parts, the file is corrupt) 回答1: fs core library should suffice for that. Here is the list of functions to use: fs.open(path, flags, [mode], callback) fs.write(fd, buffer, offset, length, position, callback) fs.writeSync(fd, buffer, offset, length, position) fs.read(fd, buffer, offset, length, position, callback) fs.readSync(fd, buffer, offset, length, position) They are analogous to

问题 Does node.js support writing random access? I see this package, but it doesn't work (if I write two or more parts, the file is corrupt) 回答1: fs core library should suffice for that. Here is the list of functions to use: fs.open(path, flags, [mode], callback) fs.write(fd, buffer, offset, length, position, callback) fs.writeSync(fd, buffer, offset, length, position) fs.read(fd, buffer, offset, length, position, callback) fs.readSync(fd, buffer, offset, length, position) They are analogous to

问题 This a topic on Haskell discussed a lot (e.g. mutable-array-implementation), but I am still not sure what is the best practice for the case requiring frequent modification and random-access of an array/vector. Say a vector of length 1,000,000. Operation on it involves accessing a (small, e.g 1000) subset of it based on input, and modifying the values based on the input. Furthermore, such operation are repeated 2,000,000 times. The task itself can be implemented in pure data structure such as

问题 Is it possible to create a stream that reads from a specific position of file in node.js? I know that I could use a more traditional fs.open / seek / read API, but in that case I need to somehow wrap them in a stream for underlying layers of my application. 回答1: fs.createReadStream() has an option you can pass it to specify the start position for the stream. let f = fs.createReadStream("myfile.txt", {start: 1000}); You could also open a normal file descriptor with fs.open() , then fs.read()

问题 As I understand it, the elements of an array are stored contiguously in memory, and accessing a particular one it is done by adding the product of the desired index and the size of each element with the base array address to find the address of the element. Since in a language like C# I can create an array of object[] s and put whatever data type I want in it, how is each element of the array stored (and kept) at a uniform length if I used differently sized types while still allowing for

问题 I have been looking at similar questions regarding how to generate random numbers in python. Example: Similar Question - but i do not have the problem that the randomfunction returns same values every time. My random generator works fine, the problem is that it returns the same value when calling the function at, what I think, the same second which is undesireable. My code looks like this def getRandomID(): token = '' letters = "abcdefghiklmnopqrstuvwwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"

问题 According to this FAQ on zlib.net it is possible to: access data randomly in a compressed stream I know about the module Bio.bgzf of Biopyton 1.60, which: supports reading and writing BGZF files (Blocked GNU Zip Format), a variant of GZIP with efficient random access, most commonly used as part of the BAM file format and in tabix. This uses Python’s zlib library internally, and provides a simple interface like Python’s gzip library. But for my use case I don't want to use that format.

问题 According to this FAQ on zlib.net it is possible to: access data randomly in a compressed stream I know about the module Bio.bgzf of Biopyton 1.60, which: supports reading and writing BGZF files (Blocked GNU Zip Format), a variant of GZIP with efficient random access, most commonly used as part of the BAM file format and in tabix. This uses Python’s zlib library internally, and provides a simple interface like Python’s gzip library. But for my use case I don't want to use that format.