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GetX 关于报错 Null check operator used on a null value的解决
import 'package:flutter/material.dart'; import 'package:get/get.dart'; import 'logic.dart'; class GetIndexPage extends StatefulWidget { int count; Get ......
TabError: inconsistent use of tabs and spaces in indentation
001、python程序报错如下: 002、报错原因(看着缩进是一样的,实际上是不一样的) 003、解决方法 将缩进统一调整为tab键, 对齐即可。 参考:https://blog.51cto.com/yunyaniu/4724938 。 ......
ptyhon: remame file using Prefix and suffix
# 创建测试文件 #for i in range(0, 10): #f = open('test/' + str(i) + '.txt', 'a+') #f.close() path = input("请输入路径:") print("该文件夹中的所有文件有:") temp_file_name = [ ......
Why is 127.0.0.1 used for localhost?
Why is 127.0.0.1 used for localhost? Does anyone know why that number was chosen? Although it’s not documented anywhere (at least as far as I know), b ......
python: using pdfplumber Lib read pdf file
from openpyxl import Workbook from openpyxl.styles import PatternFill,Side,Border import pdfplumber l=[] def visitDir(path): if not os.path.isdir(path ......
Python+selenium报错raise NoSuchDriverException(f"Unable to obtain {service.path} using Selenium Manager; {err}")...解决方案
一、问题描述 进行自动化测试执行程序报错如下图: 二、解决方案 在网上找了好久都没找到答案,最后根据以往经验想到是不是selenium版本有问题,本人python版本是3.11.0,所以将selenium版本也降到3.11.0之后问题解决。 selenium降版本: pip3 install sel ......
Traceback (most recent call last) 解决方法:不用 python3 这个命令,新版本用python38这个命令
## 一、报错内容: ubuntu1804编译升级 Python3.8.0 打不开终端、输入不存在的命令不是提示,而是显示下面报错 ```bash Traceback (most recent call last): File "/usr/lib/command-not-found", line 2 ......
删除Docker镜像报错 image is being used by stopped container ae8f224fe0e1
该报错原因是因为镜像被其他容器引用 1.查询所有容器 包括未运行的 docker ps -a 2. 删除容器 docker rm 5573214dd069 3.删除镜像 docker rmi 9c7a54a9a43c ......
How to use handleChange() function in react component?
An onChange event is triggered when values are entered in the input. This fires a function handleChange(), that is used to set a new state for the inp ......
【转】python踩坑(FileNotFoundError: Could not find module '此处省略了一些路径win_amd64.dll' (or one of its dependencies). Try using the full path with constructor syntax.)
1、报错 (FileNotFoundError: Could not find module '此处省略了一些路径\site-packages\scipy\.libs\libbanded5x.GL5FZ7Y77HIKQFNMZKUOMV5GID6YMX2V.gfortran-win_amd64.dl ......
react-native项目启动报错 Error: `fsevents` unavailable (this watcher can only be used on Darwin)
react-native项目启动报错——watchman安装问题(mac pro) Looking for JS files in /Users/你的名称/Documents/project/文件夹名 Loading dependency graph.../Users/你的名称/Documents/ ......
centos7 安装 pylzma 失败:/usr/bin/ld: this linker was not configured to use sysroots
问题背景: centos7 安装 pythond的 pylzma 模块失败。 报错内容: pip install pylzma Collecting pylzma Using cached pylzma-0.5.0.tar.gz (4.2 MB) Building wheels for collec ......
在Vscode使用命令npm报错-The operation was rejected by your operating system. npm ERR! It's possible that the file was already in use (by a text editor or antivirus)
##报错信息: PS D:\disk\xubo\个人博客文章\27-Vue\资料(含课件)\vuedemo\vueproject> npm i pubsub-js npm ERR! code EPERM npm ERR! syscall open npm ERR! path D:\disk\soft ......
java.net.BindException: Address already in use: JVM_Bind <null> 的解决方案
# 问题描述 > 在学习SSM整合中 , 启用Tomcat插件时出现以下错误 ```java java.net.BindException: Address already in use: JVM_Bind ``` 通过查阅资料发现是端口被占用了 # 解决方案 通过命令查看进程 , 这里我的是808 ......
VS2022 - 取消global using
### 如何取消global using? 最近下载最新版VS之后,会自动生成GlobalUsings.g.cs, 每次都想删除掉,但是都不好用,查了官网, 需要手动添加如下配置: `disable` 在csproj文件,也就是双击项目名,可以打开 ``` netcoreapp3.1 enable ......
C#中的using用法总结
using一般有两个作用: 1、作为语句,用于定义一个范围,在此范围的末尾将释放对象(IDisposable和IAsyncDisposable接口) 2、作为指令,用于引入命名空间或者类型,或者为引入的命名空间或者类型定义别名 using语句 using语句应该都很熟悉了吧,从最早的ADO.net, ......
mysql: [Warning] Using a password on the command line interface can be insecure.
https://zhuanlan.zhihu.com/p/542166965 ......
java.sql.SQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '}' at line 1
# 问题 报错代码 ``` org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. Cause: java.sql.SQLSyntaxErrorException: You have an err ......
再次认识using
今天看了同事代码,发现using新的语法糖。顿时来了兴趣,赶紧找文档看看,看看更新了那些东西 ![image](https://img2023.cnblogs.com/blog/411991/202306/411991-20230629002002199-896544475.png) ## 基础用法 ......
2: using 命令
using static using static System.Console; internal class Program { static void Main(string[] args) { WriteLine("What is your name?"); using global ......
using 指令
您可以使用 using namespace 指令,这样在使用命名空间时就可以不用在前面加上命名空间的名称。这个指令会告诉编译器,后续的代码将使用指定的命名空间中的名称。 https://www.lekaowang.com/jkgls/fdsg/ ......
Building a Dice Game using JavaScript Javascript构建一个dice game 项目
We will be building a Dice Game Project using HTML, CSS, and JavaScript. The Dice Game is based on a two-player. Both players roll the dice and the pl ......
Design a Drum-kit web app using JavaScript Javascript设计drum-kit项目
We all must have seen a drum kit in some concert or elsewhere, it is a collection of drums, cymbals and other percussion instruments. But have you eve ......
rename files using a regex with bash
1 for old in *.png;do 2 3 new=$(echo $old | sed s/abc/xyz/) 4 5 mv $old $new 6 7 done ......
系统断电后,MySQL重启失败:[ERROR] Binlog has bad magic number; It‘s not a binary log file that can be used by this version of MySQL
系统断电后,MySQL重启失败: [ERROR] Binlog has bad magic number; It‘s not a binary log file that can be used by this version of MySQL [ERROR] Can't init tc log [ ......
python: GUI using tkinter
""" StudentUI.py 读文件类 date 2023-06-24 edit: Geovin Du,geovindu, 涂聚文 ide: PyCharm 2023.1 python 11 """ import datetime import sys import os from tkinte ......
Authentication to host '10.167.32.123' for user 'root' using method 'mysql_native_password' failed with message: Reading from the stream has failed
连接Mysql5.7以上的版本的数据库出现报错: C#连接远程连接mysql时,抛异常:Authentication to host '10.167.32.123' for user 'root' using method 'mysql_native_password' failed with me ......
Faster sorting algorithms discovered using deep reinforcement learning
## 摘要: - `AlphaDev`模型优化排序算法,将排序算法提速70%。通过强化学习,AlphaDev发现了更加有效的算法,直接超越了科学家和工程师们几十年来的精心打磨。现在,新的算法已经成为两个标准C++编码库的一部分,每天都会被全球的程序员使用数万亿次。 ## 介绍 - 优化目标为排序算法 ......
ceph问题记录:1 daemons have recently crashed
#### 问题: ceph 集群运行运行过程中出现警告`1 daemons have recently crashed` #### 排查 1、查询最新 crash 信息 `ceph crash ls-new` ``` [root@node1 ~]# ceph crash ls-new ID ENTI ......