subprocess

问题 I was using the subprocess module to run the shell command in python 3. Here is my code import subprocess filename = "somename.py" # in practical i'm using a real file, this is just for example subprocess.call("pep8 %s" % filename, shell=True)) The output for different files is just 0 or 1 . I am quite new to python 3. Using this in 2.7 gives me the desired output, but here i am not able to figure it out. This is the output i get in python 2.7 (for a file named - anu.py ) - anu.py:2:1: W191

问题 Honestly, I just don't understand the lingo of "non-zero" status to really interpret what's going on or what that means (it wasn't even defined) on help pages. What are some examples of using python to call other scripts in which these processes of subprocess.call subprocess.check_output subprocess.popen really differ from each other? When would you use either of those, and what are the disambiguated details of these methods? Should I be using os.system instead if I wanted simple OS calls?

问题 Honestly, I just don't understand the lingo of "non-zero" status to really interpret what's going on or what that means (it wasn't even defined) on help pages. What are some examples of using python to call other scripts in which these processes of subprocess.call subprocess.check_output subprocess.popen really differ from each other? When would you use either of those, and what are the disambiguated details of these methods? Should I be using os.system instead if I wanted simple OS calls?

问题 This is a follow up question for write to output stream and returning value from shell script function. In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. But when the script is used as a autosys job. then messages from logic functions ends up in error stream file triggering alerts. Is there any way, messages from logic function can be written to output stream and not

问题 This is a follow up question for write to output stream and returning value from shell script function. In shell script, echo can be used to return values from functions. But, if those functions want to print some messages. Then, this can be done by redirecting it to error stream. But when the script is used as a autosys job. then messages from logic functions ends up in error stream file triggering alerts. Is there any way, messages from logic function can be written to output stream and not

问题 I can run this normally on the command line in Linux: $ tar c my_dir | md5sum But when I try to call it with Python I get an error: >>> subprocess.Popen(['tar','-c','my_dir','|','md5sum'],shell=True) <subprocess.Popen object at 0x26c0550> >>> tar: You must specify one of the `-Acdtrux' or `--test-label' options Try `tar --help' or `tar --usage' for more information. 回答1: You have to use subprocess.PIPE , also, to split the command, you should use shlex.split() to prevent strange behaviours in

问题 I have the following line in a Python script that runs a separate Python script from within the original script: subprocess.Popen("'/MyExternalPythonScript.py' " + theArgumentToPassToPythonScript, shell=True).communicate() Using the above line, any print() statements found in the separate Python file do appear in the console of the main Python script. However, these statements are not reflected in the .txt file log that the script writes to. Does anyone know how to fix this, so that the .txt

问题 I have a problem calling subprocess.Popen from a view: The view that calls subprocess.Popen is not displayed until the subprocess finishes. The server send "200 OK" immediately, but not the content of the page. My question is: Is this a limitation of Django's development server or am I doing it wrong? The server does not completely hangs, as other views can be processed in the meantime. There are already a few questions on that topic and Google gives a few other threads, but I cannot find a

问题 I have used the subprocess module in Python 2.7.6 to establish an SSH. I realise that this is not recommended, but I am unable to install other Python SSH libraries such as paramiko and fabric. I was just wondering if someone wouldn't mind just telling me how I'd now go about sshProcess = subprocess.call(['ssh', '-t', '<REMOTE>', 'ssh', '<REMOTE>']) I want to carry out commands in REMOTE with the subprocess approach. Is there any way to do this? Unfortunately, REMOTE is protected by a

问题 I have used the subprocess module in Python 2.7.6 to establish an SSH. I realise that this is not recommended, but I am unable to install other Python SSH libraries such as paramiko and fabric. I was just wondering if someone wouldn't mind just telling me how I'd now go about sshProcess = subprocess.call(['ssh', '-t', '<REMOTE>', 'ssh', '<REMOTE>']) I want to carry out commands in REMOTE with the subprocess approach. Is there any way to do this? Unfortunately, REMOTE is protected by a