packagemainimport"fmt"funcmain(){//这是我们使用range去求一个slice的和。使用数组跟这个很类似。创建数组nums:=[]int{2,3,4}sum:=0for_,num:=rangenums{sum+=num}fmt.Println("sum:",sum)//在数组...

 1、性能都比较高，性能对我们来说应该都不是瓶颈总体来讲，TPS方面redis和memcache差不多，要大于mongodb2、操作的便利性memcache数据结构单一redis丰富一些，数据操作方面，redis更好一些，较少的网络IO次数mongodb支持丰富的数据表达，索引，最类似关系型数据库，支持的查询...

 mongo下载：https://www.mongodb.com/download-center/community?jmp=nav创建目录，将下载的文件放在如下位置xxx@ubuntu:/usr/local$sudomkdirmongoxxx@ubuntu:/usr/local$lsbinetcgamesi...

 bool,string(u)int,(u)int8,(u)int16,(u)int32,(u)int64,uintptr(指针)byte,rune(字符)float32,float64,complex64(复数),complex128(复数) ...

 packagemainimport"fmt"funcvariableinitial(){vara,bint=3,4varsstring="abc"fmt.Println(a,b,s)}funcmain(){variableinitial()}输出34abc 变量后面的类型可以省略。此时，可以把不同...

 s是空字符串，不会打印packagemainimport"fmt"funcvariable(){varaintvarsstringfmt.Println(a,s)}funcmain(){fmt.Println("helloworld!")variable()}输出helloworld!0 如果要打...

 https://studygolang.com/dl一直下一步即可。...

 cookiehistory=request.COOKIES.get('history',None)cookie_str=''ifhistory:cookies=history.split(',')ifkwincookies:cookies.remove(kw)cookies.insert(0,kw)#如果存...

 获取get请求里面参数的两种方法之三种写法一，当get网址是127.0.0.1:8000/info/?id=20&s_id=30这种类型的网址时我们在urls的路由的urlpatterns里面里面这样定义路由url(r'info/$',views.info),那么我们怎么把参数取出来呢因为我们调用的...

 通过shell脚本对MongoDB进行自动化操作运行写好的./show.sh脚本 发现能够建立mongo链接#!/bin/shmongoWordPress--eval"showcollections;db.posts.find().limit(10);"或者把mongo作为shell解析器：#!/...

 sudoapt-getinstallros-indigo-map-server ...

 CMakeWarningat/opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76(find_package):Couldnotfindapackageconfigurationfileprovidedby"camera_info_manager"w...

 CMakeWarningat/opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76(find_package):Couldnotfindapackageconfigurationfileprovidedby"pcl_ros"withanyofthef...

 CMakeWarningat/opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76(find_package):Couldnotfindapackageconfigurationfileprovidedby"pcl_conversions"witha...

 CMakeWarningat/opt/ros/indigo/share/catkin/cmake/catkinConfig.cmake:76(find_package):Couldnotfindapackageconfigurationfileprovidedby"map_msgs"withanyofthe...