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import asyncio import sys class AsyncContextManager: async def __aenter__(self): return self async def __aexit__(self, exc_type, exc_val, exc_tb): pri 阅读全文
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JavaScript 1. splice let arr = [1, 2, 3, 5, 6, 4, 3, 2, 1, 1, 2, 3, 4, 5] for(let i = 0; i < arr.length - 1; ++i) { for(let j = i + 1; j < arr.length; 阅读全文
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JavaScript let arr = [8, 4, 3, 2, 6, 7, 1, 5, 9] function quickSort(arr) { console.log(arr) if(arr.length <= 1) return arr let midIndex = parseInt(arr 阅读全文
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while initialize test change operation change, test, operation's order will affect the first line number 阅读全文
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What is the GCD? In mathematics, the greatest common divisor (gcd) of two or more integers, when at least one of them is not zero, is the largest posi 阅读全文
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The division (/) operator produces the quotient of its operands where the left operand is the dividend and the right operand is the divisor. The divis 阅读全文
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find out diagonal for(let b = 1; b <= 9; ++b) { let res = '' for(let p = 1; p <= 9; ++p) { if(b > p) res += ' ' else res += '*' } console.log(res) } f 阅读全文
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SQLSTATE - Wikipedia 阅读全文
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overflow: hidden, display: inline-block => BFC padding position float border padding 阅读全文
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Java can't return value Python can only return None JavaScript can return any value 阅读全文
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XMLHttpRequest (javascript.info) <body> <script> // Create a new XMLHTTPRequest object let xhr = new XMLHttpRequest() xhr.timeout = 5000 // timeout in 阅读全文
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MySQL create table new_table select c1,c2 from old_table [where 1=2] lose index, auto_increment create table new_table like old_table table structure 阅读全文
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connection import psycopg2 from psycopg2 import Error, connection, cursor conn: connection | None = None c1: cursor | None = None try: conn = psycopg2 阅读全文
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Pool 使用pool正确方法: 从pool取connection,使用完close(), 底层CMySQLConnection会return到deque, 此时从pool中得到的PooledMySQLConnection底层_cnx变为None 阅读全文
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String workspace = "/opt/jenkins/workspace/${JOB_NAME}" def v = 'v' env.e1 = 'v1' pipeline { agent { node { label 'master' customWorkspace "${workspac 阅读全文
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1. push.default https://www.fleekitsolutions.com/difference-between-push-default-matching-simple/ Set your push.default to upstream to push branches t 阅读全文
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Snippet Generator => steps (place into the steps) 只有脚本script{}可声明变量,String,def声明的变量只有script{}可用 # # Plugins # # Organization and Administration Config 阅读全文
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package main import ( "fmt" "math" "runtime" "strconv" "strings" "time" ) func producer(intChan chan int) { for b := 1000; b <= 1099; b++ { intChan <- 阅读全文
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contra-variance from typing import Callable class Food: ... class Meat(Food): ... class Animal: def eat(self, food: Food): ... class Dog(Animal): def 阅读全文