At Seattle. Before landing, a warehouse? of Boeing. You know, Boeing is located at Seattle. Airbus A350-941 (reg N505DN) of Delta Airlines (DL). A very cutting-edge model, strongly recommend by ...

权限管理是开发中常见的场景，传统方法可能依赖数组、字典或数据库，尤其是在权限很多的情况下，大量的变量命名以及重复运用会增加代码的复杂度，而且更容易出错。今天分享如何用 位运算 来管理权限，包括 赋予、移除 和 检查 操作。 什么是位运算？ 位运算是直接对整数的二进制位进行操作的方式。Python 提供了多种位运算符，例如： &（按位与）：两个对应位都为 1 时结果为 1。 ...

因为我的博客是GitHub Pages搭建的，纯静态也主打迁移方便。当然今天写文章的时候报错了。 build The current runner (ubuntu-24.04-x64) was detected as self-hosted because the platform does not match a GitHub-hosted runner image (or tha...

用户会给你填写奇奇怪怪的东西，你想好怎么应对了吗？今天在刷leetcode的pandas，2885. Rename Columns，有感而发。 直接看题目吧，其实很简单，但是我现在会想，万一有的测试样例里面，Column Name不是这四个，或者顺序错了怎么办。偷懒可以直接令columns = [,,,,,,]，但是如果顺序不对，缺少或者更多，程序都会报错。 DataFrame s...

Except the inbox, he must check his junk box every day.

杠杆ETF，英文Leveraged ETF，这是一种更为安全的杠杆投资方式。杠杆ETF相当于在原始投资标的的基础上添加了杠杆，其每日涨跌幅是追踪标的的杠杆倍数。 我们投资纳斯达克指数可以通过纳斯达克ETF（QQQ），当我们看多的时候，为了增加收益，可以买入两倍做多纳斯达克ETF（QLD）、三倍做多纳斯达克（TQQQ）。QLD每日涨幅是QQQ的两倍。同样的，看空的时候也可以买入做空是纳斯达克...

People who have once been to both Hong Kong and Singapore must be confused by how to distinguish MTR and MRT. The only difference is in the word order, and it is easy to mix up without long-term st...

Previously, I use blog system provided by third-party companies, that brings a log of restrictions. Platforms like CSDN also seem not friendly if I wish to publish any high-quality content, as blog...

这是一个我用chatgpt生成的代码，并做了一些修改。 import os from PIL import Image from PyPDF2 import PdfMerger def convert_jpg_to_pdf(jpg_path, pdf_path): image = Image.open(jpg_path) image = image.convert('RG...

When it comes to building a strong investment portfolio, selecting assets based on solid financial indicators is crucial. Among the most important metrics are Return on Equity (ROE), Price-to-Earni...