GCP: global external HTTPS LB for securely exposing insecure VM services.GCP: VM instances running as the Compute Engine default service account.GCP: Deploying a 2nd gen Python Cloud Function and exposing from an HTTPS LB.GCP: Cloud Function to handle requests to HTTPS LB during maintenance.Kubernetes: kustomize overlay to enrich a base resource.Kubernetes: volumeMount, emptyDir, and env equivalents during local Docker development.Kubernetes: kustomize transformations with patchesJson6902.Kubernetes: kustomize transformations with patchesStrategicMerge.GCP: Enable Anthos Config Management (ACM) on a GKE cluster.Ubuntu: install latest git client from PPA to fix ‘unsafe repository’ errors.GitHub: CLI tool for repository operations.
Pythonspot, subprocess.popen, call, and check_outputĪuthor Fabian Posted on SeptemSeptemCategories Python Tags async, blocking, exec, live, poll, popen, process, python, real, subprocess, time Post navigation However using poll, you get the ouput in real-time.Įndpoint, realtime output from subprocess You then get an example of how municate() does not show the output until the subprocess is complete. runProcessWithLiveOutput.pyĮxecute which commmand : Download this into the same directory as the Bash loopWithSleep.sh as an example program. # Poll process.stdout to show stdout liveįor an example that pulls all this together, see my runProcessWithLiveOutput.py on github. Process = subprocess.Popen(shlex.split(command),shell=False,stdout=process.PIPE) However if you use subprocess.Popen along with Popen.poll() to check for new output, then you see a live view of the stdout. If you start a process using process.call() or process.check_output(), then you cannot get the output until the process is compete. Below is the full script: #!/bin/bashĮvery second it displays a line of output and takes a total of 5 seconds to run. This is a better end-user experience for longer running jobs.Īs an example of a long running command, consider the Bash script loopWithSleep.sh which I’ve uploaded to github. In this article I will show how to invoke a process from Python and show stdout live without waiting for the process to complete. Using subprocess.Popen, subprocess.call, or subprocess.check_output will all invoke a process using Python, but if you want live output coming from stdout you need use subprocess.Popen in tandem with the Popen.poll method.
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