蟒蛇子进程异常

我使用subprocess.check_output命令为两个不同的命令，并在一种情况下，我得到了一个subprocess.CalledProcessError，在另一种情况下，不是，但程序崩溃。该gpio482文件夹不存在与设定方法返回错误和get方法崩溃是捕获异常蟒蛇子进程异常

Get方法：

try: 
    subprocess.check_output("echo 0 > /sys/class/gpio/gpio482/value", shell=True) 
except subprocess.CalledProcessError: 
    log("set state failed.") 
    return "not-writable"

Get方法是崩溃了：

try: 
    state_string = subprocess.check_output("cat /sys/class/gpio/gpio482/value", shell=True) 
except subprocess.CalledProcessError: 
    log("Get state failed.") 
    return "integer", "0" # unknown

有我做错了什么？

如果我运行shell的commonds我得到了同样的错误消息：

>>> subprocess.check_output("cat /sys/class/gpio/gpio482/value", shell=True) 
cat: can't open '/sys/class/gpio/gpio482/value': No such file or directory 
Traceback (most recent call last): 
File "<stdin>", line 1, in <module> 
File "/usr/lib/python2.7/subprocess.py", line 573, in check_output 
raise CalledProcessError(retcode, cmd, output=output) 
subprocess.CalledProcessError: Command 'cat /sys/class/gpio/gpio482/value' 
returned non-zero exit status 1 
>>> 
>>> 
>>> subprocess.check_output("echo 0 > /sys/class/gpio/gpio482/value", 
shell=True) 
/bin/sh: /sys/class/gpio/gpio482/value: No such file or directory 
Traceback (most recent call last): 
File "<stdin>", line 1, in <module> 
File "/usr/lib/python2.7/subprocess.py", line 573, in check_output 
raise CalledProcessError(retcode, cmd, output=output) 
subprocess.CalledProcessError: Command 'echo 0 > 
/sys/class/gpio/gpio482/value' returned non-zero exit status 1

来源

2017-10-18 fresh

你得到了什么错误信息？ –

如果我在shell上尝试两行，我得到了相同的错误消息。 – fresh

无法重现你的情况，你确定你的程序已经处理了'CalledProcessError' –

两个功能如下所示。 set函数可以正常工作，并且捕获异常，但是在get函数中我崩溃了。

def get_uid_light_state(): 
log("get_uid_light_state") 

try: 
    state_string = subprocess.check_output("cat /sys/class/gpio/gpio482/value", shell=True) 
except subprocess.CalledProcessError: 
    log("Get state failed.") 
    return "integer", "0" 

if state_string == "1\n": 
    return "integer", "2" 
elif state_string == "0\n": 
    return "integer", "1" 

def set_uid_light_state(snmptype, state): 
if snmptype != "integer": 
    return "wrong-type" 

if state == "1": 
    cmd_set_state = "echo 0 > /sys/class/gpio/gpio482/value" 
elif state == "2": 
    cmd_set_state = "echo 1 > /sys/class/gpio/gpio482/value" 
else: 
    log("Invalid value for set uid light state") 
    return "wrong-value" 

try: 
    subprocess.check_output(cmd_set_state, shell=True) 
except subprocess.CalledProcessError: 
    log("Set state failed.") 
    return "not-writable" 

return "DONE"

来源

2017-10-18 11:26:34 fresh

蟒蛇子进程异常

回答

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