Dict 键值和 Number 的故事 | Leetao's Blog

主站展示位

Pymysql error- cryptography is required for sha256_password or caching_sha2_password | Leetao's Blog

前言重新安装了 Docker，然后启动其中的 MySQL 镜像，通过 pymysql 去连接数据库，出现了下面错误: cryptography is required for sha256_password or caching_sha2_password 解决方法1解决方法其实很简答，安装 cryptography 这个库就可以解决问题了。 1pip install cryptography

4 2024-11-22 21:53 查看原文

Ubuntu 找回 Mysql 的 root 密码 | Leetao's Blog

前言年纪大了就容易忘事,一转眼就把自己的服务器上 MySQL 的 root 密码给忘记了,几经周折最后把密码找回来了,准确的说是把密码重新设置了一下。 解决办法Mysql 版本 5.7.23 修改 mysql 的配置文件在命令下输入如下命令: 1sudo nano /etc/mysql/mysql.cnf 然后添加如下配置,网上都说在 [mysqld] 下面添加,我的配置文件什么都没有,我只好手

4 2024-11-22 17:52 查看原文

Number of Boomerangs | Leetao's Blog

Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of points (i, j, k) such that the distance between i and j equals the distance between i and k (the order of the tu

4 2024-11-23 05:43 查看原文

Keyboard Row | Leetao's Blog

Given a List of words, return the words that can be typed using letters of alphabet on only one row’s of American keyboard like the image below. Example 1: 12Input: ["Hello", "Alaska&q

3 2024-12-09 11:52 查看原文

Longest Harmonious Subsequence | Leetao's Blog

We define a harmonious array is an array where the difference between its maximum value and its minimum value is exactly 1. Now, given an integer array, you need to find the length of its longest harm

3 2024-12-05 01:51 查看原文

Wiggle Sort II | Leetao's Blog

Given an unsorted array nums, reorder it such that nums[0] < nums[1] > nums[2] < nums[3].... Example:(1) Given nums = [1, 5, 1, 1, 6, 4], one possible answer is [1, 4, 1, 5, 1, 6].(2) Given nums = [1,

2 2024-12-16 13:37 查看原文

Island Perimeter | Leetao's Blog

You are given a map in form of a two-dimensional integer grid where 1 represents land and 0 represents water. Grid cells are connected horizontally/vertically (not diagonally). The grid is completely

2 2024-11-22 07:37 查看原文

Automated deployment of hexo via github action | Leetao's Blog

前言每年都要折腾一下自己的博客，今年准备把所有的博客再次迁移到静态博客 Hexo 中，配合 Github Action 实现，只需要一个浏览器就可以自动部署博客。

2 2024-12-14 10:42 查看原文

Rust笔记-数据类型（二）-- 复合 | Leetao's Blog

这是自己学习 Rust 的学习笔记，由于 Rust 语言处于初期，变动可能会比较大，文章不一定会及时同步，学习过程中需要仔细甄别 复合类型复合类型（Compound types）可以将多个值组合成一个类型。Rust 有两个原生的复合类型：元组（tuple）和数组（array） 元组元组是一个将多个其他类型的值组合进一个复合类型的主要方式。我们使用包含在圆括号中的逗号分隔的值列表来创建一个元组。元组

4 2024-11-20 10:58 查看原文

Set Matrix Zeroes | Leetao's Blog

给定一个 m x n 的矩阵，如果一个元素为 0，则将其所在行和列的所有元素都设为 0。请使用原地算法。 示例 1: 输入: [ &nbsp;&nbsp;&nbsp;&nbsp;[1,1,1], &nbsp;&nbsp;&nbsp;&nbsp;[1,0,1], &nbsp;&nbsp;&nbsp;&nbsp;[1,1,1]]输出:[ &nbsp;&nbsp;&nbsp;&nbsp;[1,

3 2024-12-24 23:54 查看原文

Jinjia2 自定义 filter | Leetao's Blog

前言用过 flask 的人肯定对 jinjia2 不会陌生,自然对 Jinjia2 自带的 filter 也有印象，但是其自带的 filter 实在有限，有些时候就不得不需要我们自己定义 filter 了,接下来的例子将介绍如何自定义 filter 自定义 filter举个例子自定义 filter 其实很简单，写一个函数实现你需要的功能，然后添加到 jinjia_env 中，这里以一个返回列表长度

2 2024-11-22 16:30 查看原文

python内置常量(built-in constants)-NotImplemented | Leetao's Blog

定义NotImplemented 的在标准库的定义如下: Special value which should be returned by the binary special methods (e.g. eq() , lt(), add(), rsub(), etc.) to indicate that the operation is not implemented with respec

2 2024-12-17 14:28 查看原文

Three Sum | Leetao's Blog

给定一个包含 n 个整数的数组 nums，判断 nums 中是否存在三个元素 a，b，c ，使得 a + b + c = 0 ？找出所有满足条件且不重复的三元组。 注意：答案中不可以包含重复的三元组。 例如, 给定数组 nums = [-1, 0, 1, 2, -1, -4]， 满足要求的三元组集合为：[ [-1, 0, 1], [-1, -1, 2]] Solution 思路很简单先计算

1 2024-11-22 06:28 查看原文

Replace Words | Leetao's Blog

In English, we have a concept called root, which can be followed by some other words to form another longer word - let’s call this word successor. For example, the root an, followed by other, which ca

5 2024-11-23 02:33 查看原文

Minimum Index Sum of Two Lists | Leetao's Blog

Suppose Andy and Doris want to choose a restaurant for dinner, and they both have a list of favorite restaurants represented by strings. You need to help them find out their common interest with the l

4 2024-11-20 12:06 查看原文

Set Mismatch | Leetao's Blog

The set S originally contains numbers from 1 to n. But unfortunately, due to the data error, one of the numbers in the set got duplicated to another number in the set, which results in repetition of o

3 2024-11-22 16:27 查看原文

Runtime.getRuntime().exec -- Cannot run program CreateProcess error=2, The system cannot find the file specified | Leetao's Blog

问题原因最近有个需求用Java调用nginx -V并返回输出,查了一下决定使用Runtime.getRuntime().exec()去执行命令.代码如下: 1process = Runtime.getRuntime().exec(cmd, null, dir); 最初调用函数将正确路径和cmd都传入进去,其中cmd为nginx -V,但是返回下列错误: Cannot run program “

3 2024-11-26 12:27 查看原文

Find the Difference | Leetao's Blog

Given two strings s and t which consist of only lowercase letters. String t is generated by random shuffling string s and then add one more letter at a random position. Find the letter that was added

2 2024-12-13 12:35 查看原文

HTTP 状态码 302,303,307 | Leetao's Blog

最近一直在看《

2 2024-12-12 10:00 查看原文

wtforms 使用的一些问题总结 | Leetao's Blog

Q&A Q1. 用IntegerField来限制form只能用数字 但是发现它只能接受1以上 不能接受0 如何设置 A1:添加代码validators=[InputRequired()] Q2. 让 IntegerField 的输入框只允许输入数字,即选渲染后的输入框类型为 number A2: 添加代码widget=NumberInput(), 引入 from wtforms

2 2024-11-21 18:40 查看原文