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I want to run the next command
subprocess.Popen("soffice --accept='socket,host=localhost,port=8100;urp;'", shell=True)
to make soffice listen localhost:8100. It is work in python 2.7.9, but doesn't in python 3.4.3. I control it by
netstat -a | grep 8100

Can you explain what is working in Python 2.7 that is not working in 3.4? Do you have an exception, error message, relevant netstat output, etc. What platform?
I don’t have Open Office on this computer, but I tried the following (Linux) command lines and both did what I expected:
"echo --accept='socket,host=localhost,port=8100;urp;'"
"sleep 3 && echo done"

After executing this code in Python 2.7 I check if OpenOffice is listening the localhost:8100, and get the output:
netstat -a | grep 8100
tcp 0 0 localhost:8100 *:* LISTEN
If I executing the same code in Python 3.4 and check, I get nothing.
Platform: Ubuntu 15.04. In fact, command runs any office installed on the computer (LibreOffice or OpenOffice), and on my computer I have LibreOffice.
There are no messages, the command runs normal, just not working as it should.

With both python 2 and 3, what does "ps -efww | fgrep soffice" produce?

Hello, Eric and Martin!
I don't know what happened, but now it works. I have checked this problem on two computers two days ago, and then the command was not working.
But now, I run exactly that command, and it works as should.
I don't know what has changed. Maybe, because I installed the OS update before I test again.
Thank you for attention and your time.