I want to run a long process (calculix simulation) via python.
As mentioned here one can read the console string with communicate().
As far as I understand the string is returned after the process is completed? Is there a possibility to get the console output while the process is running?
You have to use subprocess.Popen.poll to check process terminates or not.
while sub_process.poll() is None:
output_line = sub_process.stdout.readline()
This will give you runtime output.
This should work:
sp = subprocess.Popen([your args], stdout=subprocess.PIPE)
while sp.poll() is None: # sp.poll() returns None while subprocess is running
output = sp.stdout # here you have acccess to the stdout while the process is running
# Do stuff with stdout
Notice we don't call communicate() on subprocess here.
calculixsimulation write data on console while running ?