So im trying to save the output from my subprocess.call but I keep getting the following error: AttributeError: 'int' object has no attribute 'communicate'
Code is as follows:
p2 = subprocess.call(['./test.out', 'new_file.mfj', 'delete1.out'], stdout = PIPE) output = p2.communicate[0] You're looking for subprocess.Popen() instead of call().
You also need to change it to p2.communicate()[0].
Popen unless your use case requires it.That's because subprocess.call returns an int:
subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False) Run the command described by args. Wait for command to complete, then return the returncode attribute. It looks like you want subprocess.Popen().
Here's a typical piece of code I have to do this:
p = Popen(cmd, stdout=PIPE, stderr=PIPE, bufsize=256*1024*1024) output, errors = p.communicate() if p.returncode: raise Exception(errors) else: # Print stdout from cmd call print output You should use subprocess
try: subprocess.check_output(['./test.out', 'new_file.mfj', 'delete1.out'], shell=True, stderr=subprocess.STDOUT) except subprocess.CalledProcessError as exception: print exception.output 
Popenwere basically correct in 2012 when this question was asked, but the modern correct answer is to usesubprocess.run, orsubprocess.check_outputif you need a simple API and/or compatibility back to older Python versions. Thesubprocessdocumentation spells this out, in the very first paragraph of the first section; "The recommended approach to invoking subprocesses is to use therun()function for all use cases it can handle."