Process text file. One line at a time. Python is 45% shorter (19 vs 34 line) but go run 25% faster (1.23 vs 1.70 second on 500,000 line file). But I prefer go because easier distribute (build exe file)

readline.go

package main
import (
    "fmt"
    "bufio"
    "os"
    "regexp"
    "strings"
    "time"
)

func main(){
    start := time.Now()
    f, _ := os.Open("d:\\2015\\Standish STR12A\\log\\1000373.LOG")
    defer f.Close()
    sc := bufio.NewScanner(f)
    sc.Split(bufio.ScanLines)
    re, _ := regexp.Compile("BOARD\\d\\dQ\\d=[-\\d]")
    prefix := ""

    for sc.Scan(){
        s := string(sc.Text())
        switch{
            case len(s) > 30 && string(s[0]) == "@":
                prefix = strings.Replace(s[1:], " ", ",", -1)
            case re.MatchString(s):
                s = strings.Replace(s, "=", ",", -1)
                s = strings.Replace(s, "(", ",", -1)
                s = strings.Replace(s, ")", ",", -1)
                s = strings.Replace(s, "M", "", -1)
                fmt.Println(prefix+","+s)
        }
    }
    fmt.Printf("time usage = %.12f", time.Since(start).Seconds())
}

readline.py

import re
import string
import time

start = time.time()

f = open("1000373.LOG", "r")
prefix = ""
for line in f:
    if len(line) > 30 and line.startswith("@"):
        prefix = string.replace(line, " ", ",")[1:].strip()
    elif re.match("BOARD\\d\\dQ\\d=[-\\d]", line):
        line = string.replace(line, "=", ",")
        line = string.replace(line, "(", ",")
        line = string.replace(line, ")", ",")
        line = string.replace(line, "M", "")
        print prefix + "," + line,

print "time usage = ", time.time() - start

Note: Both python and go not check any error.
Python time usage = 1.70300006866 second
Go time usage = 1.234375000000 second
Text file have 489477 line. File size = 16,115,227 byte

Change text file to 3.348 Million line. File size 104 MB. Go run about 30% faster
Go 8.078125 second vs Python 11.5939998627 Second
Run on windows XP SP3
CPU Intel Core2 Quad Q9300 @2.5GHz. 4 GB ram