appium 用执行时提示Fatal Error: EPIPE: broken pipe, write

# !/usr/bin/env python
# -*- coding:utf-8 -*-

import os


class DosCmd(object):

    def execute_cmd_result(self, command):
        result_list = []
        result = os.popen(command).readlines()
        for i in result:
            if i == '\n':
                continue
            else:
                result_list.append(i.strip("\n"))
        return result_list

    def execute_cmd(self, command):
        os.popen(command)  # 这个有错


if __name__ == '__main__':
    dos = DosCmd()
    # print(os.popen("netstat -ano|findstr 8080").readlines())
    print(dos.execute_cmd_result("adb devices"))
    dos.execute_cmd("appium -p 4701 -bp 5700 -U 127.0.0.1:21513 --no-reset --session-override")

后来才发现自己写错了，应该用os.system() 而不是os.popen()