read lines write lines like python api in golang

readLines-writeLines.go

package main

import (
   "io"
   "os"
   "bufio"
   "bytes"
   "fmt"
   "strings"
)


func readLines(path string)(lines [] string,err error){
   var (
       file *os.File
       part [] byte
       prefix bool
   )
   
   if file, err = os.Open(path); err != nil {
       return
   }
   
   reader := bufio.NewReader(file)
   buffer := bytes.NewBuffer(make([]byte,1024))
   
   for {
      if part, prefix, err = reader.ReadLine();err != nil {
          break
      }
      buffer.Write(part)
      if !prefix {
         lines = append(lines,buffer.String())
         buffer.Reset()
      }
   }
   if err == io.EOF {
      err = nil
   }
   return
}


func writeLines(lines [] string,path string)(err error){
    var file *os.File
    
    if file,err = os.Create(path); err != nil{
         return
    }
    
    defer file.Close()
    
    for _,elem := range lines {
       _,err := file.WriteString(strings.TrimSpace(elem)+"\n")
       if err != nil {
           fmt.Println(err)
           break
       }
    }
    return
}

func main(){
   lines, err := readLines("5906376")
   if err != nil{
      fmt.Println("Error:%s\n",err)
      return
   }
   for _,line := range lines {
      fmt.Println(line)
   }
   
   err= writeLines(lines,"a.txt")
   fmt.Println(err)
}

in readLines

buffer := bytes.NewBuffer(make([]byte,1024))

should be buffer := bytes.NewBuffer(make([]byte,0))
cause buffer.Write do an append job