Python 的 Keyword-Only Arguments (强制关键字参数)
直接看一个正常的函数及其调用:调用:defdog(name,host,age):print(name,host,age)dog('dobi','xuzhoufeng',2)#dobixuzhoufeng2上例中,函数有三个位置参数,我们在调用中在相应位置传递对应值即可,而keyword-onlyar...
hdu 3307 Description has only two Sentences (欧拉函数+快速幂)
DescriptionhasonlytwoSentencesTimeLimit:3000/1000MS(Java/Others)MemoryLimit:65536/32768K(Java/Others)TotalSubmission(s):852AcceptedSubmission(s):259Pr...
codis扩容报错:[error] READONLY You can't write against a read only slave
现象:最近在做codis在线扩容时,添加多组group,每个group添加一个redis作为master,当进行autobalance或手动迁移slot时,发现要迁移的slot的状态处于error状态,并且一直阻塞后面要迁移的slot,最终导致proxy挂掉,无法对外提供服务。查看dashboard...
"this is incompatible with sql_mode=only_full_group
一、原理层面 这个错误发生在mysql5.7版本及以上版本会出现的问题: mysql5.7版本默认的sql配置是:sql_mode="ONLY_FULL_GROUP_BY",这个配置严格执行了"SQL92标准"。 很多从5.6升级到5.7或更高版本时,为了语法兼容,大部分都会选择调...
django apscheduler在特定时间执行一次任务(run at a specify time only once)
如何使程序在特定时间只执行一次,我查了一下。 celery可以,时间以秒计。task=mytask.apply_async(args=[10,20],countdown=60)不过,我们存在以天、星期、甚至月的倒计时,感觉celery还是不满足需求。最后找到了apscheduler。from...
Android Studio 3.0:Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated
Android Studio 3.0指定apk输出目录的方法报错:Cannot set the value of read-only property 'outputFile' for ApkVariantOutputImpl_Decorated{apkData=Main{type=MAIN, fu...
virtualbox centos7 nat+host-only方式联网踩坑总结
最近公司需要配置服务器,要求centos虚拟机可以yum install、docker拉互联网镜像,因此需要访问互联网。那么本文就介绍一下virtualbox centos7 nat+host-only方式联网踩坑总结,感兴趣的可以了解一下
Swift 4解决错误:UIApplication.registerForRemoteNotifications() must be called from main thread only
Xcode 9 (iOS 11)注册推送消息报错:UIApplication.registerForRemoteNotifications() must be called from main thread only解决方法Swift 4DispatchQueue.main.async(execut...
Cannot uninstall 'PyYAML'. It is a distutils installed project and thus we cannot accurately determine which files belong to it which would lead to only a partial uninstall.
使用pip在Ubuntu上安装tfx(TensorFlowextended):pipinstall-qtfx==0.15.0rc0报错:ERROR:Cannotuninstall'PyYAML'.Itisadistutilsinstalledprojectandthuswecannotaccurat...
Eclipse IDE – Tomcat Version 6.0 Only Supports J2EE 1.2, 1.3, 1.4, And Java EE 5 Web Modules
在Eclipse中发布tomcat项目时,遇到了一个问题,tomcat6.0不能加载,并出现EclipseIDE–TomcatVersion6.0OnlySupportsJ2EE1.2,1.3,1.4,AndJavaEE5WebModules 这样的提示信息,后来google了一下,原来在建立项目的...
Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 Web modules
原文出处:http://jingwang0523.blog.163.com/blog/static/9090710320113294551497/ 最近在用eclipse做项目,新建项目时什么都贪新,用最新的版本,在Dynamicwebmoduleversion栏里选了最新的3.0版本,布署项目的...
解决Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web modules
Tomcatversion7.0onlysupportsJ2EE1.2,1.3,1.4,andJavaEE5and6Webmodules1.在eclipse的workspace里面找到该项目.settings文件夹2.编辑org.eclipse.wst.common.project.facet.co...
报错修改:Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web
在eclipse的workspace里面找到该项目。依次进入:.settings->org.eclipse.wst.common.project.facet.core.xml。打开文件后,将下面的版本改低一点。<installedfacet="jst.web"version="3.1"/...
Eclipse报错:Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web modules
首先再eclipse中找到该项目的work空间eclipse中的项目右键选择properpies,搜索resourse找到路径进入.settings文件夹中找到org.eclipse.wst.common.project.facet.core.xml配置文件将<installedfacet="...
Tomcat version 7.0 only supports J2EE 1.2, 1.3, 1.4, and Java EE 5 and 6 Web modules
在将项目添加到tomcat下时报错,Tomcatversion7.0onlysupportsJ2EE1.2,1.3,1.4,andJavaEE5and6Webmodules 1.在eclipse的workspace里面找到该项目.settings文件夹2.编辑org.eclipse.wst.comm...
Database 'xxx' cannot be upgraded because it is read-only or has read-only file Make the database or files writeable, and rerun recovery.
在分离数据库DatabaseName(暂且用DatabaseName代替该数据库名)后,我将其数据文件以及日志文件移动到新增的磁盘上。然后附加该数据库,结果报如下错误:Database'DatabaseName'cannotbeupgradedbecauseitisread-onlyorhasre...
mysql中Table is read only的解决方法小结
本文章总结了关于在linux与windows中 mysql出现Table is read only解决办法总结,有需要的朋友可参考一下
permissions is only granted to system apps 错误
permissionsisonlygrantedtosystemappsandroidstudio中:File-Setting-Editor-Inspections,Android>Lint>Correctness下的Usingsystemapppermission,然后设置右侧的Sev...
VirtualBox中CentOS通过Host-Only方式实现虚拟机主机互相访问、共享上网
VirtualBox常用的网络配置如下:连接方式主机访问虚拟机虚拟机访问主机虚拟机访问虚拟机虚拟机访问外网说明网络地址转换(NAT)不支持支持不支持支持默认连接方式,虚拟IP,VirtualBox内部进行网络转换桥接网卡支持支持支持支持此方式相当于真实电脑,真实IP,会占用真实的网络IP资源仅主机(...
The MySQL server is running with the --read-only option so it cannot execute this statement
1、错误描述Causedby:java.sql.SQLException:TheMySQLserverisrunningwiththe--read-onlyoptionsoitcannotexecutethisstatementatcom.mysql.jdbc.SQLError.createSQLE...