问题描述
我想在运行 os.system 调用后获取变量中的 stdout.
I want to get the stdout in a variable after running the os.system call.
以这一行为例:
batcmd="dir"
result = os.system(batcmd)
result 将包含错误代码(stderr 0 在 Windows 下或 1 在某些 linux 下用于上述示例).
result will contain the error code (stderr 0 under Windows or 1 under some linux for the above example).
如何在执行命令中不使用重定向的情况下获取上述命令的 stdout?
How can I get the stdout for the above command without using redirection in the executed command?
推荐答案
如果你只需要 stdout 输出，那么看看 subprocess.check_output():
If all you need is the stdout output, then take a look at subprocess.check_output():
import subprocess
batcmd="dir"
result = subprocess.check_output(batcmd, shell=True)
因为您使用的是 os.system()，所以您必须设置 shell=True 以获得相同的行为.您确实希望注意关于将不受信任的参数传递给的安全问题你的外壳.
Because you were using os.system(), you'd have to set shell=True to get the same behaviour. You do want to heed the security concerns about passing untrusted arguments to your shell.
如果您还需要捕获stderr，只需在调用中添加stderr=subprocess.STDOUT:
If you need to capture stderr as well, simply add stderr=subprocess.STDOUT to the call:
result = subprocess.check_output([batcmd], stderr=subprocess.STDOUT)
将错误输出重定向到默认输出流.
to redirect the error output to the default output stream.
如果知道输出是文本，添加text=True，使用平台默认编码解码返回的bytes值；如果该编解码器对于您接收的数据不正确，请改用 encoding="...".
If you know that the output is text, add text=True to decode the returned bytes value with the platform default encoding; use encoding="..." instead if that codec is not correct for the data you receive.
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