Centos7 安装zbar 出现的问题1、 yum install python-devel问题一：MarkdownDownloading packages:Delta RPMs disabled because /usr/bin/applydeltarpm not installed.File "/usr/libexec/urlgrabber-ext-down", line 28except

temp_list = [‘A’,‘B’,‘C’]1, 字典生成式{list[i]: i for i in range(len(temp_list ))}2，enumerate{k: v for v, k in enumerate(temp_list )}3,zipdict(zip(lst,range(len(temp_list ))))4, mapdict(map(reversed, enume

问题描述：使用 pdf2image pdf文件转 image 时异常：\"Unable to get page count. Is poppler installed and in PATH?\"\npdf2image.exceptions.PDFInfoNotInstalledError: Unable to get page count. Is poppler installed and in

在 docker 中运行 apt-get update 报错 returned a non-zero code: 100出现问题：在构建 docker 执行 Dockerfile 中的 RUN apt-get update 时报错 returned a non-zero code: 100。其大致错误内容如下格式：Get:36 http://ftp.uni-stuttgart.de/debian

问题描述：使用 pdf2image pdf文件转 image 时异常：\"Unable to get page count. Is poppler installed and in PATH?\"\npdf2image.exceptions.PDFInfoNotInstalledError: Unable to get page count. Is poppler installed and in

单例模式实现 logging 日志实例化#!/usr/bin/python# -*- coding: UTF-8 -*-import loggingimport logging.handlersimport osclass Logger(object):__flag = Nonedef __new__(cls, *args, **kwargs):if not cls.__flag:cls.__fl

centos服务器重启后启动redis服务一、 未配置 系统 Unit 手动重启1、查看redis配置文件路径2、找到 redis-server 启动文件3、 服务启动./redis-server ../etc/redis.conf4、查看服务状态二、 配置 Unit service 启动服务1、创建服务(redis.conf 配置）vim /lib/systemd/system/redis.se