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在Python的string前面加上‘r’， 是为了告诉编译器这个string是个raw string，不要转意backslash '\' 。 例如，\n 在raw string中，是两个字符，\和n， 而不会转意为换行符。由于正则表达式和 \ 会有冲突，因此，当一个字符串使用了正则表达式后，最好在前面加上'r'。
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版权声明：本文为CSDN博主「orzlzro」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/orzlzro/article/details/6645909

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import datetime
now = datetime.datetime.now()

print(now.strftime('%Y-%m-%d-%H-%M-%S'))
print(now.strptime('09/19/18 13:55:26','%m/%d/%y %H:%M:%S'))

# strftime convert time to string format; strptime convert string to given format.

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<template>
  <div class="about">
    <div class="player">
      <iframe width="100%" height="100%" 
      src="https://www.videoindexer.ai/embed/player/00000000-0000-0000-0000-000000000000/9a296c6ec3" frameborder="0" allowfullscreen></iframe>
    </div>

    <div class="analyzer">
      <iframe width="100%" height="780" 
      src="https://www.videoindexer.ai/embed/insights/00000000-0000-0000-0000-000000000000/9a296c6ec3/?widgets=people,keywords,annotations" frameborder="0" allowfullscreen></iframe>

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function sleep(ms){

    return new Promise(function(resolve){
        setTimeout(function(){
            resolve('sleep for '+ ms + 'ms');
        }, ms);
    });
}

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package com.company;

interface Shape{

    void draw();

}

class Circle implements Shape{

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package com.company;
import java.util.Observable;
import java.util.Observer;

class ObservableObj extends Observable{

    private int watched;

    ObservableObj (int watched){

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const fs = require('fs');
const Promise = require('promise');
const assert = require('assert');

/*
var p1 = new Promise(function(reject, resolve){

  //let result=  fs.readFileSync('./index.html');
  let result=  fs.readFileSync('./main.html');
  

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const async = require('async');

var arr =[5,4,3,2,1];

async.forEachOf(arr, (index,i, callback)=>{

    setTimeout(()=>{console.log(`Wait for ${index} seconds`);   callback(null);}, index*1000);
 //这里的关键在于callback必须是在循环的异步方法里面，否则是无法起作用的。
  
}, function(err){

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 const thumb = require('node-thumbnail').thumb;

 thumb({
 source: './img',  //can be directory
 destination: './pics', // can be directory
 concurrency:4,
 width: 50 
 }, (files, err, stdout, stderr)=> console.log('all done!'));
 
 /**

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import com.amazonaws.services.lambda.runtime.RequestHandler;
import com.amazonaws.services.lambda.runtime.Context;

public class EchoHello implements RequestHandler <Request, Response> {

    public Response handleRequest(Request request, Context context) {

        String greetingString = String.format("Hello %s %s.", request.firstName, request.lastName);
        return new Response(greetingString);
    }