标签：range 输出 python margin delete japan col var 删除
1.定义一个集合 感觉和python的字典差不多
func main() {
//定义一个集合
var countryCapitalMap map[string]string /*创建集合 */
//创建集合
countryCapitalMap = make(map[string]string)
/* map插入key - value对,各个国家对应的首都 */
countryCapitalMap["France"] = "Pais"
countryCapitalMap["Italy"] = "罗马"
countryCapitalMap["Japan"] = "东京"
countryCapitalMap["India "] = "新德里"
fmt.Println(countryCapitalMap)
}
2.循环输出key value
func main() {
var countryCapitalMap map[string]string /*?????oé????? */
countryCapitalMap = make(map[string]string)
/* map??’?…￥key - value?ˉ1,?????a???????ˉ1?o”???é|–é?? */
countryCapitalMap["France"] = "Paris"
countryCapitalMap["Italy"] = "??—é??"
countryCapitalMap["Japan"] = "????o?"
countryCapitalMap["India "] = "?–°??·é??"
for country := range countryCapitalMap {
fmt.Println(country, countryCapitalMap[country])
}
}
3.判断key是否存在
var countryCapitalMap map[string]string /*创建集合 */
countryCapitalMap = make(map[string]string)
/* map插入key - value对,各个国家对应的首都 */
countryCapitalMap["France"] = "Paris"
countryCapitalMap["Italy"] = "罗马"
countryCapitalMap["Japan"] = "东京"
countryCapitalMap["India "] = "新德里"
//ok为bool值，为true那么captial就是这个key的value
captial, ok := countryCapitalMap["Italy"]
if ok {
fmt.Println(ok, "存在首都是", captial)
} else {
fmt.Println("不存在")
}
4.删除key value
var countryCapitalMap map[string]string /*?????oé????? */ countryCapitalMap = make(map[string]string) /* map??’?…￥key - value?ˉ1,?????a???????ˉ1?o”???é|–é?? */ countryCapitalMap["France"] = "Paris" countryCapitalMap["Italy"] = "??—é??" countryCapitalMap["Japan"] = "????o?" countryCapitalMap["India "] = "?–°??·é??" delete(countryCapitalMap, "France") fmt.Println(countryCapitalMap)
标签：range 输出 python margin delete japan col var 删除
原文地址：https://www.cnblogs.com/Jack-cx/p/10182650.html
