如何在Go中跳过文件的第一行？

Question

How can I read a file in Go and skip the first line / headers?

In Python I know I could do

counter = 0
with open("my_file_path", "r") as fo:
    try:
        next(fo)
    except:
        pass
    for _ in fo:
         counter = counter + 1

This is my Go application

package main    
import (
    "bufio"
    "flag"
    "os"
)

func readFile(fileLocation string) int {
    fileOpen, _ := os.Open(fileLocation)
    defer fileOpen.Close()
    fileScanner := bufio.NewScanner(fileOpen)

    counter := 0
    for fileScanner.Scan() {
        //fmt.Println(fileScanner.Text())
        counter = counter + 1
    }

    return counter
}

func main() {
    fileLocation := flag.String("file_location", "default value", "file path to count lines")
    flag.Parse()

    counted := readFile(*fileLocation)
    println(counted)
}

I will be reading a huge file and don't want to be evaluating each line if the index is 0.

Answer 1

you can try something like this

func readFile(fileLocation string) int {
            fileOpen, _ := os.Open(fileLocation)
            defer fileOpen.Close()
            fileScanner := bufio.NewScanner(fileOpen)
            counter := 0
            for fileScanner.Scan() {
                // read first line and ignore
                fileScanner.Text()
                break
            }

           for fileScanner.Scan() {
                // read remaining lines and process
                txt := fileScanner.Text()
                counter = counter + 1
               // do something with text
            }


            return counter
        }

Edit:

func readFile(fileLocation string) int {
            fileOpen, _ := os.Open(fileLocation)
            defer fileOpen.Close()
            fileScanner := bufio.NewScanner(fileOpen)
            counter := 0
            if fileScanner.Scan() {
                // read first line and ignore
                fileScanner.Text()
            }

           for fileScanner.Scan() {
                // read remaining lines and process
                txt := fileScanner.Text()
               // do something with text
               counter = counter + 1
            }


            return counter
        }