a.go

package main

import (
	"bufio"
	"encoding/csv"
	"fmt"
	"golang.org/x/text/encoding/japanese"
	"golang.org/x/text/transform"
	"io"
	"os"
	"strings"
)

func main() {

	fp := os.Stdin

	reader := csv.NewReader(transform.NewReader(bufio.NewReader(fp), japanese.ShiftJIS.NewDecoder()))
	reader.Comma = '\t'
	reader.LazyQuotes = true

	for {
		record, err := reader.Read()
		if err == io.EOF {
			break
		} else if err != nil {
			panic(err)
		}

		fmt.Println(strings.Join(record[3:6], ":"))
	}
}

a.py

# -*- coding: utf-8 -*-

import csv
import sys
import io

fp = open(sys.stdin.fileno(), 'r', encoding='sjis')
tsv = csv.reader(fp, delimiter = '\t')

for row in tsv:
    print(":".join(row[3:5]))

gistfile1.txt

$ uname -a
Darwin XXX 15.6.0 Darwin Kernel Version 15.6.0: Wed Nov  2 20:30:56 PDT 2016; root:xnu-3248.60.11.1.2~2/RELEASE_X86_64 x86_64 i386 MacBookPro11,1 Darwin

$ wc -l a.tsv
1000000 a.tsv
$ file --mime a.tsv
a.tsv: text/plain; charset=unknown-8bit


$ go version
go version go1.7 darwin/amd64

# go build
$ time cat a.tsv | ./a > /dev/null

real	0m4.691s
user	0m4.349s
sys	0m0.470s


$ python -V
Python 3.5.2 :: Anaconda custom (x86_64)

$ time cat a.tsv | python a.py > /dev/null

real	0m4.682s
user	0m4.584s
sys	0m0.185s