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I am not sure what the return value of subprocess.call() means.
Can I safely assume a zero value will always mean that the command executed successfully?
Is the return value equivalent to the exit staus of a shell command?
For example, will the following piece of code work for virtually any command on Linux?
cmd = "foo.txt > bar.txt" ret = subprocess.call(cmd, shell=True) if ret != 0: if ret < 0: print "Killed by signal", -ret else: print "Command failed with return code", ret else: print "SUCCESS!!" Please enlighten me :-)
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subprocess. check_output() is the one that runs the command and returns the return value. If you want the output write your value to STDOUT and use check_output() to get the value.
communicate() #Another way to get output #output = subprocess. Popen(args,stdout = subprocess. PIPE). stdout ber = raw_input("search complete, display results?") print output #... and on to the selection process ...
Subprocess call():Subprocess has a method call() which can be used to start a program. The parameter is a list of which the first argument must be the program name. The full definition is: subprocess.call(args, *, stdin=None, stdout=None, stderr=None, shell=False) # Run the command described by args.
CalledProcessError Exception raised when a process run by check_call() or check_output() returns a non-zero exit status. returncode Exit status of the child process.
Yes, Subprocess.call returns "actual process return code".
You can check official documentation of Subprocess.call and Subprocess.Popen.returncode
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It is the return code, but keep in mind it's up to the author of the subprocess what the return code means. There is a strong culture of 0 meaning success, but there's nothing enforcing it.
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