I'm the Python beginner and I have a task to do. I have to write a function, that opens a program (.bin), execute it so I can see the results. This program requires 2 arguments from command line. I used os.spawnv, but it doesn't work...
#!/usr/bin/python import sys import os def calculate_chi(): if len(sys.argv)>1: pdb_name=sys.argv[1] dat_name=sys.argv[2] crysol='/usr/bin/crysol' os.spawnv(os.P_NOWAIT,crysol,[crysol,pdb_name,dat_name]) def main(): calculate_chi() Can you help me?
You can use python subprocess module:
import subprocess proc = subprocess.Popen(['/usr/bin/crysol', sys.argv[1], sys.argv[2]], shell=True, stdout=subprocess.PIPE, stderr=subprocess.STDOUT) while proc.poll() is None: out = proc.stdout.readline() #read crystol's output from stdout and stderr print out retunValue = proc.wait() #wait for subprocess to return and get the return value Use subprocess. It was intended to replace spawn.
import subprocess subprocess.call([crysol, pdb_name, dat_name]) 
Everyone uses subprocess.Popen these days. An example call to your process would be
process = Popen(["/usr/bin/crysol", pdb_name, dat_name], stdout=subprocess.PIPE, stderr=subprocess.PIPE) 