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The difference between underline and dot of golang import package

2022-04-23 19:21:00 【Handsome that handsome】

stay golang When importing packages , We sometimes encounter the need to underline or dot the front of the package , I never understood what it meant , Then a search was carried out ：

The package is underlined _： When importing a package , All the documents under the package init Functions are executed , But sometimes we just need to use init Function. I don't want to import the whole package into （ Do not use other functions in the package ）

Before the bag is a dot .：

import（.“fmt”）
The meaning of this point operation is that after the package is imported, when you call the function of the package , You can omit the prefix package name , That's what you called earlier fmt.Println(“hello world”) It can be written as Println(“hello world”)

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