• 2019-09-09 python调用外部程序


    1.wget--用于下载;ffmpeg--多媒体处理(音频,视频);free

    2.调用外部程序两种方法:

    os.system:(标准库中的非内置库)=Windows下的命令行

    例如:

    import os

    os.system("mspaint")

    print('after call')

    subprocess:

    import subprocess
    res = subprocess.check_output('dir',shell=True)
    print(res.decode('gbk'))

    from subprocess import Popen
    popen = Popen(
    args = 'mspaint e:\33.jpg',
    shell= True
    )
    print("done")

    from subprocess import Popen,PIPE
    popen = Popen(
    args = 'mspaint e:\33.jpg',
    stdout= PIPE,
    stderr= PIPE,
    shell= True,
    encoding= 'gbk'
    )
    output,err = popen.communicate()
    print(output)
    print('------------')
    print(err)

    3.返回值

    Windows:

    .exe程序的退出码是程序的退出

    Linux:

    判断返回码是不是0;如果是1则失败;

    例如:

    import os

    res = os.system('cp /opt/file1 /home/jcy/file1')

    if res ==0:

      print('file copied.')

    else:

      print('copy file failed!!')

    4.

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  • 原文地址:https://www.cnblogs.com/baiyy/p/11490449.html
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