We’ll review its different uses and main keyword arguments. Subprocess includes several classes and functions, but in this tutorial we’ll cover one of subprocess’s most useful functions: n. Since any program you can access on your computer can be controlled by subprocess, the examples shown here will be applicable to any external program you might want to invoke from your Python code. For example, you might want to invoke git from within your Python code to retrieve files in your project that are tracked in git version control. You might find subprocess useful if you want to use another program on your computer from within your Python code. Python 3 includes the subprocess module for running external programs and reading their outputs in your Python code.

Indeed, he decided to close the file after the first communicate: Traceback (most recent call last):įile '/usr/lib64/python2.5/subprocess.py', line 667, in communicateįile '/usr/lib64/python2.5/subprocess.The author selected the COVID-19 Relief Fund to receive a donation as part of the Write for DOnations program. The problem here is that the second time, Python isn't happy.

Print municate('select theta,zeta,result from experiment_2099 ') Print municate('select a,b,result from experiment_1412 ') Whenever I open a pipe using the Python subprocess module, I can only communicate with it once, as the documentation specifies: Read data from stdout and stderr, until end-of-file is reached proc = sub.Popen('psql -h darwin -d main_db'.split(),stdin=sub.PIPE,stdout=sub.PIPE) It's not the first time I'm having this problem, and it's really bugging me.

Subprocess python ffmpeg communicate