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cmd = "sudo start service/newservice db=temp"
p = subprocess.Popen(shlex.split(cmd), stderr=subprocess.STDOUT)
Above command works fine and intented process is spawned.
cmd = "sudo stop service/newservice db=temp"
p = subprocess.Popen(shlex.split(cmd), stderr=subprocess.STDOUT)
In the same file when above is called. It gives error.
traceback (most recent call last):
      File "<stdin>", line 1, in <module>
      File "/usr/lib/python2.7/subprocess.py", line 672, in __init__
        errread, errwrite)
      File "/usr/lib/python2.7/subprocess.py", line 1213, in _execute_child
        raise child_exception
    TypeError: must be encoded string without NULL bytes, not str
                maybe you can try stopping the first process from python, instead of launching another process to kill the first. see this link for details: stackoverflow.com/questions/4084322/…
– symbiotech
                Nov 20, 2013 at 9:58
                could be some strange character inserted in there, see this: stackoverflow.com/questions/15203106/…
– symbiotech
                Nov 20, 2013 at 10:32
I got it solved. I only converted cmd to str before passing it to shlex.split, this is good esp when you receive some input this way:
cmd = "sudo stop service/newservice db=" + db
Safer practice is to convert it to string anyway.
                Please use format specifier in that.. for eg.     cmd = "sudo stop service/newservice db=%s"%str(db)
– Nilesh
                Nov 21, 2013 at 10:45
        
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