subprocess

问题 I need to disable sys.stderr messages, which produced by some *.jar file. This *.jar file is calling by subprocess.check_call(cmd) from sklear2pmml method __init__.py of external library ( sklear2pmml library). I know, that I can disable stderr by changing library code to something like this: fnull = open(os.devnull,'w') subprocess.check_call(cmd,stderr=fnull) But this treak leads to changing python library, that I don't want. How can I fix stderr output without this side effect? 回答1: One

问题 I need to run the following information in windows command line. Someone kindly helped me with the syntax for subprocess.run(). I get the error "[WinError 5] Access is denied", which potentially requires admin access rights. How can I use subprocess.run() as administrator? [Not on a corporate pc or anything, I have access to administrator rights] subprocess.run([ r'"C:\Program Files\ANSYS Inc\ANSYS Student\v194\Framework\bin\Win64\runwb2"', '-B', '-F', r'E:\MEngA\Ansys\IFD_PartA_Rev3.wbpj', '

问题 I am a complete beginner so apologies for any mistakes. This is my code in Python 3.5. It executes in Raspbian on a Raspberry Pi 3. import subprocess radio = subprocess.Popen(["mplayer", 'http://edge-bauerabsolute-02-gos1.sharp-stream.com/absolute90s.mp3?'], shell = False , stdout=subprocess.PIPE) print ("Other code - no waiting for the subprocess to finish") The radio plays for about 30 seconds and then stops. I want it to run in the background without the script waiting for the subprocess

问题 I have this simple async code that spawns sleep 3 and then waits for it to complete: from asyncio import SelectorEventLoop, create_subprocess_exec, \ wait_for, get_event_loop, set_event_loop def run_timeout(loop, awaitable, timeout): timed_awaitable = wait_for(awaitable, timeout=timeout, loop=loop) return loop.run_until_complete(timed_awaitable) async def foo(loop): process = await create_subprocess_exec('sleep', '3', loop=loop) await process.wait() print(process.returncode) Notice how it

问题 I know that it is bad practice to use shell=True for subprocesses. However for this line of code, I'm not sure how to execute it with shell=False subprocess.Popen('candump -tA can0 can1 >> %s' %(file_name), shell=True) Where the command I want to run is: candump -tA can0 can1 >> file_name Where file_name is /path/to/file.log 回答1: You can't directly use piping in the command the way you do with shell=True , but it's easy to adapt: with open(file_name, 'ab') as outf: proc = subprocess.Popen([

问题 I know that it is bad practice to use shell=True for subprocesses. However for this line of code, I'm not sure how to execute it with shell=False subprocess.Popen('candump -tA can0 can1 >> %s' %(file_name), shell=True) Where the command I want to run is: candump -tA can0 can1 >> file_name Where file_name is /path/to/file.log 回答1: You can't directly use piping in the command the way you do with shell=True , but it's easy to adapt: with open(file_name, 'ab') as outf: proc = subprocess.Popen([

问题 I'm trying to trying to run another script via the shell, that uses a modified set of environment variables. def cgi_call(script, environ): pSCRIPT = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, env=environ, shell=True) pc = pSCRIPT.communicate() status = "200 OK" headers = [('Content-Type',"text/html")] if pc[1] != '': raise RuntimeError, pc[1] else: rval = str(pc[0]) return status, headers, rval After running the code above, I get the

问题 I'm trying to trying to run another script via the shell, that uses a modified set of environment variables. def cgi_call(script, environ): pSCRIPT = subprocess.Popen(script, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE, env=environ, shell=True) pc = pSCRIPT.communicate() status = "200 OK" headers = [('Content-Type',"text/html")] if pc[1] != '': raise RuntimeError, pc[1] else: rval = str(pc[0]) return status, headers, rval After running the code above, I get the

问题 I'm using the execl function to run a Linux process from C. When I do, for example: int cmd_quem() { int result; result = fork(); if(result < 0) { exit(-1); } if (result == 0) { execl("/usr/bin/who", "who", NULL); sleep(4); //checking if father is being polite exit(1); } else { // father's time wait(); } return 0; } I get on the console the result of doing "who" on the terminal. What I'd like to know is if there is any function to "catch" the output result from a command. What I mean is, if

问题 Ideally it should be like a list of commands that I want to execute and execute all of them using a single subprocess call. I was able to do something similar by storing all the commands as a shell script and calling that script using subprocess, but I want a pure python solution.I will be executing the commands with shell=True and yes I understand the risks. 回答1: Use semicolon to chain them if they're independent. For example, (Python 3) >>> import subprocess >>> result = subprocess.run(