generator

Create a generator that yields values from any number of inner generators

由 核能气质少年 提交于 2019-12-19 18:55:07
问题 I have a generator function generate which yields 5 random numbers one at a time. I need to be able to generate the numbers in two ways: Single generation, which means a single output of generate function Multiple generation, which means multiple execution of generate and yielding all the results together as a single (merged) flow For that I wrote another function get_resource , which calls generate either once or using itertools.chain to run the generators one after another, but

How to convert Node.js async streaming callback into an async generator?

由 余生长醉 提交于 2019-12-19 11:31:30
问题 I have a function that streams data in batches via a callback. Each batch will await the callback function before fetching another batch and the entire function returns a promise that resolves when all batches are finished. (I'm using TypeScript annotations to help with readability) async function callbackStream(fn: (batch: Array<number>) => Promise<void>) {} How do I to turn this function into an async generator that yields one value at a time? async function* generatorStream():

How to convert Node.js async streaming callback into an async generator?

由 浪尽此生 提交于 2019-12-19 11:31:22
问题 I have a function that streams data in batches via a callback. Each batch will await the callback function before fetching another batch and the entire function returns a promise that resolves when all batches are finished. (I'm using TypeScript annotations to help with readability) async function callbackStream(fn: (batch: Array<number>) => Promise<void>) {} How do I to turn this function into an async generator that yields one value at a time? async function* generatorStream():

Generating and saving an .eml file with python 3.3

由 陌路散爱 提交于 2019-12-19 07:26:11
问题 I am trying to generate emails using the standard email library and save them as .eml files. I must not be understanding how email.generator works because I keep getting the error 'AttributeError: 'str' object has no attribute 'write.' from email import generator from email.mime.multipart import MIMEMultipart from email.mime.text import MIMEText active_dir = 'c:\\' class Gen_Emails(object): def __init__(self): self.EmailGen() def EmailGen(self): sender = 'sender' recepiant = 'recipiant'

Liquibase XML generator

由 霸气de小男生 提交于 2019-12-19 06:54:12
问题 Is there opensource/free liquibase (http://www.liquibase.org) xml generator? Alternative to "Power Architect and Liquibase combo". Where can I create database model and then transform it to Liquibase XML format or transform pure sql to Liquibase XML? 回答1: There isn't any available generator since I know. Actually you can do it by your own by using liquibase core classes. An example of use: // .. imports // create a changelog liquibase.changelog.DatabaseChangeLog databaseChangeLog = new

Python's PEP 484 type annotation for Generator Expression

由 ≡放荡痞女 提交于 2019-12-19 03:21:45
问题 What is the correct type annotation for a function that returns a generator expression? e.g.: def foo(): return (x*x for x in range(10)) I can't figure out if this is -> Iterator[int] , -> Iterable[int] , -> Generator[int, None, None] , or something else. If there should be one-- and preferably only one --obvious way to do it , then what is the obvious way here? 回答1: All three forms mentioned by you in question are listed as valid alternatives in documentation, Generator expression simply

Explain Swift Iterators

由 喜欢而已 提交于 2019-12-19 02:58:05
问题 There’s very little up-to-date guidance on how to make generators in Swift (or iterators as they’re apparently called in Swift), especially if you are new to the language. Why are there so many generator types like AnyIterator and UnfoldSequence ? Why doesn’t the following code, which should yield from a sequence of either individual Int s or Arrays of Int s, work? func chain(_ segments: Any...) -> AnyIterator<Int>{ return AnyIterator<Int> { for segment in segments { switch segment { case let

MyBatisGenerator工具生成的类与XML对Oracle数据库模糊查询的支持

由 Deadly 提交于 2019-12-18 18:19:13
【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> MyBatis Generator 工具可以用来生成一些工具类和XML模板，用于为用户使用Java语言访问数据库提供便利。 我使用的数据库版本为Oracle11g，JDK版本为1.8。 建表语句如下： CREATE TABLE PERSON_INFO ( ID NUMBER(12, 0) PRIMARY KEY, NAME VARCHAR(50), COMPANY VARCHAR(200) ); INSERT INTO PERSON_INFO (ID, NAME, COMPANY) VALUES (1, 'Tsybius', 'Dog Head Inc'); INSERT INTO PERSON_INFO (ID, NAME, COMPANY) VALUES (2, 'Galatea', 'Dog Head Inc'); INSERT INTO PERSON_INFO (ID, NAME, COMPANY) VALUES (3, 'Quintus', 'Dog Head Inc'); INSERT INTO PERSON_INFO (ID, NAME, COMPANY) VALUES (4, 'Gaius', 'State Grid Corporation of Mars'); INSERT INTO

C#/.NET Lexer Generators

由 為{幸葍}努か 提交于 2019-12-18 12:31:11
问题 I'm looking for a decent lexical scanner generator for C#/.NET -- something that supports Unicode character categories, and generates somewhat readable & efficient code. Anyone know of one? EDIT: I need support for Unicode categories , not just Unicode characters. There are currently 1421 characters in just the Lu (Letter, Uppercase) category alone, and I need to match many different categories very specifically, and would rather not hand-write the character sets necessary for it. Also,

Keras - How are batches and epochs used in fit_generator()?

由 徘徊边缘 提交于 2019-12-18 12:14:10
问题 I have a video of 8000 frames, and I'd like to train a Keras model on batches of 200 frames each. I have a frame generator that loops through the video frame-by-frame and accumulates the (3 x 480 x 640) frames into a numpy matrix X of shape (200, 3, 480, 640) -- (batch size, rgb, frame height, frame width) -- and yields X and Y every 200th frame: import cv2 ... def _frameGenerator(videoPath, dataPath, batchSize): """ Yield X and Y data when the batch is filled. """ camera = cv2.VideoCapture
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