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goのimport宣言

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さり気ないけれどGoで
importを宣言するとき、頭に._や名前をつけることが出来る。
それを使ってパッケージのメソッドにアクセスする。

package main

import (
  "fmt"
  . "fmt" // Println
  _ "fmt" // 利用なし
  f "fmt" // f.Println 
)

func main() {
  fmt.Println("Hello World") // Hello World
  Println("Hello World")     // Hello World
  f.Println("Hello World")   // Hello World
}

ちなみに _は、そのファイルでは使わないけれど、他パッケージで利用したい場合に使う。

参考

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