Calling matlab from python.. and have python wait for matlab to finish

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Ben Bleiman
Ben Bleiman 2011-5-23
编辑： Juan Ramirez 2018-5-15
I am attempting call matlab from a python script, and want python to wait while matlab loads, runs my script, and exits before continuing the python portion of my code.
From my research this should supposedly work:
import subprocess
from subprocess import Popen, PIPE
p = Popen("C:\\Program Files\\MATLAB\\R2008b\\bin\\matlab.exe -nosplash -r test() ", stdout = PIPE)
p.wait() # <--- blocks till done
print(p.communicate())
But when run the print statement runs well before matlab has even loaded. does anyone have any suggestions?
Thanks
Ben

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回答（2 个）

Wolfgang
Wolfgang 2013-11-4
Set pipe to non-blocking first (from http://danapeerlab.googlecode.com/svn/trunk/freecell/depends/common/python/matlabpipe.py):
import fcntl, os
flags = fcntl.fctnl(p.stdout, fcntl.F_GETFL)
fcntl.fcntl(p.stdout, fcntl.F_SETFL, flags | os.O_NONBLOCK)
Juan Ramirez
Juan Ramirez 2018-5-15
编辑：Juan Ramirez 2018-5-15
Apparently this link doesn't work anymore. But you could sidestep the problem by re-structuring your code so that executing MATLAB is the final step in your python script. Then python doesn't need to wait for its completion.
Another option is to have python execute an infinite while loop that waits for a matlab output file to be written.

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