Python，ADB和Shell执行查询 [英] Python, adb and shell execution query

问题描述

我对Python不太熟悉，但对Ruby却很熟悉。因此，我将提供我想要实现的目标的类似物

I don't have a lot of familiarity with Python but I do with Ruby. So I will provide analogues for what I want to achieve

在Ruby中，我会

val = `adb devices`

获取存储的adb设备的原始输出在val中，并且

to get the "raw output" of adb devices stored in val, and

val=system("adb devices")

获取状态代码

我想在Python中执行相同的任务。我看着

I want to perform the same tasks in Python. I looked at

from subprocess import call
call(["adb devices"])

但是失败了，我不想使用os.system，因为我想得到一些适当的错误处理。我如何进行呼叫工作以及如何从Python中的反引号获取原始输出

but that failed, I don't want to use os.system cause I want to get some proper error handling. how do i make call work and how do i obtain raw output from backticks in Python

推荐答案

将命令和参数作为单独的元素传递列表中的内容：

Pass the command and arguments as separate elements of a list:

from subprocess import call
return_code = call(["adb", "devices"])

但是，这会将输出发送到stdout，您无法捕获它。相反，您可以使用 subprocess.check_ouput（） ：

However, this sends the output to stdout and you can't capture it. Instead you can use subprocess.check_ouput():

from subprocess import check_output

adb_ouput = check_output(["adb", "devices"])
# stdout of adb in adb_output.

如果返回码非零，则会引发异常。您应该抓住它以查看返回码是什么。返回代码0不会引发异常：

If the return code is non-zero an exception is raised. You should catch it to see what the return code is. No exception is raised for return code 0:

from subprocess import check_output, CalledProcessError

try:
    adb_ouput = check_output(["adb", "devices"])
except CalledProcessError as e:
    print e.returncode

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