如何在 Go 中讀取文件并跳過第一行/標(biāo)題？在 Python 中我知道我能做到counter = 0with open("my_file_path", "r") as fo: try: next(fo) except: pass for _ in fo: counter = counter + 1這是我的 Go 應(yīng)用程序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)}我將讀取一個(gè)巨大的文件，如果索引為 0，我不想評(píng)估每一行。
3 回答
www說
TA貢獻(xiàn)1775條經(jīng)驗(yàn) 獲得超8個(gè)贊
如何移動(dòng)到循環(huán)之前的下一個(gè)標(biāo)記
scanner := bufio.NewScanner(file)
scanner.Scan() // this moves to the next token
for scanner.Scan() {
fmt.Println(scanner.Text())
}
文件
1
2
3
輸出
2
3
https://play.golang.org/p/I2w50zFdcg0
至尊寶的傳說
TA貢獻(xiàn)1789條經(jīng)驗(yàn) 獲得超10個(gè)贊
例如，
package main
import (
"bufio"
"fmt"
"os"
)
func readFile(filename string) (int, error) {
f, err := os.Open(filename)
if err != nil {
return 0, err
}
defer f.Close()
count := 0
s := bufio.NewScanner(f)
if s.Scan() {
for s.Scan() {
count++
}
}
if err := s.Err(); err != nil {
return 0, err
}
return count, nil
}
func main() {
filename := `test.file`
count, err := readFile(filename)
if err != nil {
fmt.Fprintln(os.Stderr, err)
return
}
fmt.Println(count)
}
輸出：
$ cat test.file
1234567890
abc
$ go run count.go
1
$
jeck貓
TA貢獻(xiàn)1909條經(jīng)驗(yàn) 獲得超7個(gè)贊
你可以嘗試這樣的事情
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
}
編輯：
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
}
- 3 回答
- 0 關(guān)注
- 195 瀏覽
添加回答
舉報(bào)
0/150
提交
取消