小编Gab*_*lov的帖子

所以我一直在尝试用 pyppeteer 制作一个简单的比特币价格检查器。它的工作就像一个魅力，但每当我尝试将它实现到烧瓶时，我都会收到运行时错误。

本质上，我想构建一个 Web api 调用，每当我单击按钮时，它就会调用 webscraper 文件。

如果有人可以帮助指导我，那将不胜感激！

烧瓶服务器

import webscraper
import asyncio

from flask import Flask, redirect, url_for, render_template, request

app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html', title="Home")

@app.route('/api/scrape', methods=['POST'])
def scrape():
    webscraper.crypto_price('https://coinmarketcap.com/currencies/bitcoin/')
    return redirect(url_for('index'))

if(__name__ == '__main__'):
    app.run()

Pyppeteer 文件

import asyncio
from pyppeteer import browser, launch

def write_to_file(file, text):
    f = open(file, 'w')
    f.write(text)
    f.close

def crypto_price(link):
    async def main():
        browser = await launch()
        page = await browser.newPage()
        await page.setViewport({'width': 1920, 'height': 1080})

        await …

我有一个简单的 C++ 类，它使用通用模板来存储和检索通用变量。存储它们没有问题，但返回通用变量会返回十六进制值。

有人能告诉我为什么这样做吗？

节点.h

#pragma once
#include <iostream>

template <typename T>
class Node {
    private:
        T data;
        Node *next_node;

    public:
        Node(T data) {
            this->data = data;
            std::cout << "Node with data - " << this->data << " - has been created." << std::endl;
        }
        
        T get_data() {
            return this->data;
        }
        
        void set_next_node(Node next) {
            this->next_node = next;
        }

        Node get_next_node() {
            return this->next_node;
        }
};

主程序

#include <iostream>
#include "node.h"

int main() {

    Node node = new Node("Hello World"); …

for some reason I keep getting a "TypeError: GridFsStorage is not a constructor" error. I have no idea why its giving me this error since I'm just following the official documentation.

Storage and upload

conn.once('open', ()=> {
    gfs = Grid(conn.db, mongoose.mongo)
    gfs.collection('uploads')
})

const storage = new GridFsStorage({
    url: DBURI,
    file: (req, file)=> {
        return new Promise((resolve,reject)=> {
            crypto.randomBytes(16, (err, buf)=> {
                if(err) {
                    return reject(err)
                }
                const filename = buf.toString('hex') + path.extname(file.originalname);
                const fileInfor = {
                    filename: filename,
                    bucketName: …