硬件开发不在这个帐号上，在另一个帐号navysummer-hardware 硬件号传送门->硬件开发系列教程
# last_n是数字类型，代表最新的几条数据 db.集合名.aggregate([ { "$sort": {"时间字段": -1, "数据标识字段": 1} }, { "$group": { "_id": "$数据标识字段", "latestData": {"$push": "$$ROOT"} }
1.安装依赖包 npm install sharp canvas 2.实例代码 const {createCanvas} = require('canvas'); // 在虚拟DOM环境中创建Canvas const canvas = createCanvas(300, 200); const co
1.1 创建库项目 cargo new --lib plugin cd plugin 1.2 编写加法功能函数 vim src/lib.rs #[no_mangle] pub extern fn add(left: usize, right: usize) -> usize { left + rig
# 删除几天前的文件 days=5 find /path/to/logs -type f -name "log*" ! -newermt $(date -d "$days day
1.下载并安装etcdETCD_VERSION='3.4.13' wget https://github.com/etcd-io/etcd/releases/download/v${ETCD_VERSION}/etcd-v${ETCD_VERSION}-linux-amd64.tar.gz tar -xvf etcd-v${ETCD_VERSION}-linux-amd64.tar.gz mv
from openpyxl import Workbook from openpyxl.utils import column_index_from_string, get_column_letter # 创
test.py class A: def a(self): pass @staticmethod def b(): pass @classmethod def c(cls): pass @p
1.安装openssl11 yum 安装 openssl 1.1.1k 2.安装依赖 yum install xz-devel zlib-devel bzip2-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc make lib
```bash yum install -y epel-release yum install -y openssl11 openssl11-devel ln -sf /usr/lib64/pkgconfig/openssl11.pc /usr/lib64/pkgconfig/openssl.pc
CMakeLists.txt cmake_minimum_required(VERSION 3.26) project(test) set(CMAKE_CXX_STANDARD 17) set(CMAKE_AUTOMOC ON) set(CMAKE_AUTORCC ON) set(CMAKE_AUT
#include <QCoreApplication> #include <QApplication> #include <QWidget> #include <QVBoxLayout> #include <QVideoWidget> #include <QAudio
1.部署sc ```yaml apiVersion: storage.k8s.io/v1 kind: StorageClass metadata: name: nfs-redis provisioner: kubernetes.io/no-provisioner volumeBindingMode:
```python # tensorflow里引入一个新的数据类型-张量(tensor)，与numpy的ndarray类似，是一个多维数组。和numpy的区别在于：numpy的ndarray只支持CPU计算，而张量支持GPU，可以通过GPU加速，提高速度，同时张量还支持自动微分计算，更适合深度学习
CMakeLists.txt cmake_minimum_required(VERSION 3.25) project(test) set(CMAKE_CXX_STANDARD 17) set(CMAKE_CXX_STANDARD 14) set(FFMPEG_DIR /usr/local/ffmp
配置链接库路径 sudo vim /etc/ld.so.conf.d/ffmpeg.conf /usr/local/ffmpeg/lib/ 编写CMakeLists.txt cmake_minimum_required(VERSION 3.25) project(test) set(CMAKE_CX
# -*- coding: utf-8 -*- import os import threading import time import tkinter from tkinter import TOP, LEFT, RIGHT, messagebox, filedialog, DISABLED,
# -*- coding: utf-8 -*- import os import threading import tkinter from tkinter import LEFT, RIGHT, filedialog, messagebox, DISABLED, NORMAL, TOP impor
# -*- coding: utf-8 -*- import os import time import cv2 import numpy from PIL import Image, ImageDraw, ImageFont ascii_char = list("$@B%8&WM#*oahkbdp
class NoModifyMeta(type): def __setattr__(cls, key, value): raise AttributeError(f"Cannot modify class attribute '{key}'") class ConstDict(metaclass=N
import cv2 import subprocess input_video_path = "/home/navy/Desktop/1.mp4" opencv_video_path = "/home/navy/Desktop/2.mp4" new_video_path = "/home/navy
# -*- coding: utf-8 -*- import os import subprocess import threading import time import tkinter from tkinter import TOP, LEFT, RIGHT, messagebox, file
ffmpeg -i 1.mp4 -i 2.mp4 -map 0:a -map 1:v? -c:v copy -shortest output.mp4
ffmpeg -i a.mp4 -i a.mp3 -c:v copy -c:a aac -strict experimental output.mp4
# 提取视频里的声音 ffmpeg -i 1.mp4 -vn output.mp3 # 提取视频里的画面，过滤掉声音 ffmpeg -i 1.mp4 -an output.mp4 # 同时分离视频流和音频流 ffmpeg -i 1.mp4 -vn -c:v copy audio.mp3 -an -c
1.安装OpenResty的依赖开发库 yum install -y pcre-devel openssl-devel gcc --skip-broken 2.安装OpenResty仓库 yum-config-manager --add-repo https://openresty.org/pack
string formatJson(string json) { string result = ""; int level = 0; for (string::size_type index = 0; index < json.size(); index++) { char c = json[in
import re def to_camel_case(x): """转驼峰法命名""" return re.sub('_([a-zA-Z])', lambda m: (m.group(1).upper()), x) def to_upper_camel_case(x): """转大驼峰法命名"""
1.安装 pip3 install -U lesscode_tool 2.创建项目（目前仅支持创建lesscode-py，其他项目请用subcommand实现） 2.1创建lesscode-py项目 lesscodeTool new -d test 2.2创建django项目 lesscodeToo
1.官网地址，去官网下载ffmpeg源码https://ffmpeg.org2.安装ffmpeg基础依赖sudo apt-get update sudo apt-get install build-essential yasm texi2html libvorbis-dev libmp3lame-dev libopus-dev libx264-dev libx265-dev libvpx-dev
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