小编ooo*_*ooo的帖子

pip3 install PyQt5
Collecting PyQt5
  Using cached https://files.pythonhosted.org/packages/3a/fb/eb51731f2dc7c22d8e1a63ba88fb702727b324c6352183a32f27f73b8116/PyQt5-5.14.1.tar.gz
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/usr/lib/python3.6/tokenize.py", line 452, in open
        buffer = _builtin_open(filename, 'rb')
    FileNotFoundError: [Errno 2] No such file or directory: '/tmp/pip-build-b2zw891b/PyQt5/setup.py'

    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-build-b2zw891b/PyQt5/

然后我从https://www.riverbankcomputing.com/software/pyqt/download5下载了 zip 文件夹并运行：

python3 configure.py --qmake /home/oo/Qt/5.14.0/gcc_64/bin/qmake
make
sudo make install

成功的

>>> import PyQt5
>>> import PyQt5.QtCore
Traceback (most recent …

我正在尝试以下代码：

import requests

headers = {
    'authority': 'www.nseindia.com',
    'upgrade-insecure-requests': '1',
    'user-agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.183 Safari/537.36 OPR/72.0.3815.320',
    'accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9',
    'sec-fetch-site': 'none',
    'sec-fetch-mode': 'navigate',
    'sec-fetch-user': '?1',
    'sec-fetch-dest': 'document',
    'accept-language': 'en-GB,en;q=0.9',
}

nse = requests.Session()
x = nse.get("https://www.nseindia.com/", headers=headers)

print(x.text)

以下代码在我的电脑上运行，但是当我将它放入 aws 时它没有响应。

我还检查了 pinghttps://www.nseindia.com/它是否正常工作。

requests 适用于谷歌等其他网站，但不适用于 aws 上的这个特定网站。

在 EC2 中：

Python 3.8.5 (default, Jul 28 2020, 12:59:40) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import requests …

我正在尝试学习反应钩子。我需要帮助来理解 react 函数是否总是在每次渲染时重置钩子状态。

这是我试图修复标题的滚动小示例

class Header extends Component {


    constructor(props) {
        super(props);
        console.log("Constructor")
        this.state = {fixed: false};
    }


    handleScroll = () => {
        console.log(window.scrollY);
        console.log(this.state.fixed);
        if (window.scrollY >= 25 && !this.state.fixed) {
            this.setState({
                fixed: true
            });
        } else if(window.scrollY < 25 && this.state.fixed){
            this.setState({
                fixed: false
            });
        }
    }

    componentDidUpdate(prevProps, prevState, snapshot) {
        console.log("updated ");
    }

    componentDidMount() {
        console.log("added");
        window.addEventListener('scroll', this.handleScroll);
    }

    componentWillUnmount() {
        console.log("removed");
        window.removeEventListener('scroll', this.handleScroll);
    }

    render() {
        return (
            <div></div>
        );
   }
}

输出：

Header.js:26 Constructor
Header.js:51 …

我试图将绘图烛台和 5 天平均线放在同一个 qtchart 上，但将两个 x 轴绘图代码放入 UI 加载程序

import sys
from PyQt5.QtWidgets import QApplication, QWidget
from PyQt5.QtGui import QIcon
from PyQt5 import uic
import sys
from PyQt5.QtChart import QCandlestickSeries, QChart, QChartView, QCandlestickSet
from PyQt5.QtWidgets import QApplication, QMainWindow
from PyQt5.QtCore import Qt, QPointF
from PyQt5 import QtChart as qc

# load both ui file
uifile_1 = 'UI/main.ui'
form_1, base_1 = uic.loadUiType(uifile_1)

uifile_2 = 'UI/main1.ui'
form_2, base_2 = uic.loadUiType(uifile_2)


class Example(base_1, form_1):
    def __init__(self):
        super(base_1, self).__init__()
        self.setupUi(self)
        self.pushButton_2.clicked.connect(self.change)

    def …