python 执行shell命令并将结果保存的实例

def run_cmd(cmd): result_str='' process = subprocess.Popen(cmd, shell=True,    stdout=subprocess.PIPE, stderr=subprocess.PIPE) result_f = process.stdout error_f = process.stderr errors = error_f.read() if errors: pass result_str = result_f.read().strip() if result_f:  result_f.close() if error_f:  error_f.close() return result_str

def run_cmd2file(cmd): fdout = open("file_out.log",'a') fderr = open("file_err.log",'a') p = subprocess.Popen(cmd, stdout=fdout, stderr=fderr, shell=True) if p.poll():  return p.wait() return