Python 3.5，如果語句，在Ubuntu上調用外部命令16.04

我正在寫一個簡單的腳本來檢查聲音輸出，然後切換到另一個輸出（使用os.system）。Python 3.5，如果語句，在Ubuntu上調用外部命令16.04

如何檢查聲音輸出？我想用：

pacmd list cards | grep output\:

這是顯示的內容：

 output:analog-stereo: Analogue Stereo Output (priority 6000, available: unknown) 
    output:analog-stereo+input:analog-stereo: Analogue Stereo Duplex (priority 6060, available: unknown) 
    output:hdmi-stereo: Digital Stereo (HDMI) Output (priority 5400, available: unknown) 
    output:hdmi-stereo+input:analog-stereo: Digital Stereo (HDMI) Output + Analogue Stereo Input (priority 5460, available: unknown) 
    output:hdmi-surround: Digital Surround 5.1 (HDMI) Output (priority 300, available: unknown) 
    output:hdmi-surround+input:analog-stereo: Digital Surround 5.1 (HDMI) Output + Analogue Stereo Input (priority 360, available: unknown) 
    output:hdmi-surround71: Digital Surround 7.1 (HDMI) Output (priority 300, available: unknown) 
    output:hdmi-surround71+input:analog-stereo: Digital Surround 7.1 (HDMI) Output + Analogue Stereo Input (priority 360, available: unknown) 
    output:hdmi-stereo-extra1: Digital Stereo (HDMI 2) Output (priority 5200, available: unknown) 
    output:hdmi-stereo-extra1+input:analog-stereo: Digital Stereo (HDMI 2) Output + Analogue Stereo Input (priority 5260, available: unknown) 
    output:hdmi-surround-extra1: Digital Surround 5.1 (HDMI 2) Output (priority 100, available: unknown) 
    output:hdmi-surround-extra1+input:analog-stereo: Digital Surround 5.1 (HDMI 2) Output + Analogue Stereo Input (priority 160, available: unknown) 
    output:hdmi-surround71-extra1: Digital Surround 7.1 (HDMI 2) Output (priority 100, available: unknown) 
    output:hdmi-surround71-extra1+input:analog-stereo: Digital Surround 7.1 (HDMI 2) Output + Analogue Stereo Input (priority 160, available: unknown) 
    output:hdmi-stereo-extra2: Digital Stereo (HDMI 3) Output (priority 5200, available: unknown) 
    output:hdmi-stereo-extra2+input:analog-stereo: Digital Stereo (HDMI 3) Output + Analogue Stereo Input (priority 5260, available: unknown) 
    output:hdmi-surround-extra2: Digital Surround 5.1 (HDMI 3) Output (priority 100, available: unknown) 
    output:hdmi-surround-extra2+input:analog-stereo: Digital Surround 5.1 (HDMI 3) Output + Analogue Stereo Input (priority 160, available: unknown) 
    output:hdmi-surround71-extra2: Digital Surround 7.1 (HDMI 3) Output (priority 100, available: unknown) 
    output:hdmi-surround71-extra2+input:analog-stereo: Digital Surround 7.1 (HDMI 3) Output + Analogue Stereo Input (priority 160, available: unknown) 
active profile: <output:analog-stereo>

我想一個if語句來檢查這條底線「活動簡介：」類似「如果當前情景模式==模擬立體聲：「

來源

2016-12-20 0_o

您可以使用subprocess模塊調用外部程序。這取決於你做鏈接的調用，然後解析輸出。

來源

2016-12-20 15:32:47

Python 3.5，如果語句，在Ubuntu上調用外部命令16.04

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