You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.go
    path of file: ./repos/learning/golang/practice/go-crontab/source/prepare/cmd_usage/demo2
    
    the code of the file until where you have to start completion: package main

import (
	"os/exec"
	"fmt"
)

func main
    
func main() {
	var (
		cmd *exec.Cmd
		output []byte
		err error
	)

	// 生成Cmd
	cmd = exec.Command("C:\\cygwin64\\bin\\bash.exe", "-c", "/usr/bin/python xxx.py")

	// 执行了命令, 捕获了子进程的输出( pipe )
	if output, err = cmd.CombinedOutput(); err != nil {
		fmt.Println(err)
		return
	}

	// 打印子进程的输出
	fmt.Println(string(output))
}