Os System Error Handling
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Os.system Return Value
million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Does python's `os.system` ever throw an exception? up vote 7 down vote favorite 1 Might the esteemed os.system of Python fame throw an exception? If so, which ones? python exception command-line exception-handling operating-system share|improve this question asked subprocess python example Mar 9 '11 at 20:30 Claudiu 94.7k92307493 4 os.system() is hardly esteemed anymore... –Ignacio Vazquez-Abrams Mar 9 '11 at 20:34 add a comment| 4 Answers 4 active oldest votes up vote 9 down vote accepted Short answer: yes: >>> import os >>> os.system(None) TypeError ... Long answer: look here http://docs.python.org/library/subprocess.html#subprocess-replacements to see how to avoid using os.system. share|improve this answer answered Mar 9 '11 at 20:36 phooji 6,9602338 I realize that's just one example. I'm not aware of any other possible exception types; 'wrong' string or unicode parameters are all just passed to the shell. Still... it's better to avoid using os.system. –phooji Mar 9 '11 at 20:39 1 +1 agree on avoiding os.system –samplebias Mar 9 '11 at 20:51 add a comment| up vote 4 down vote On POSIX systems it appears to be a straight pass-through to system() (listing from Python 2.7.1's posixmodule.c): static PyObject * posix_system(PyObject *self, PyObject *args) { char *command; long sts; if
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Python Os.system Output
Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Python: os.system() without return or error up vote 0 down vote favorite 2 I need to use http://stackoverflow.com/questions/5251771/does-pythons-os-system-ever-throw-an-exception os.system() a few times in my script, but I don't want errors from the shell to appear in my script's window. Is there a way to do this? I guess it's sort of like silent commands, running to their full extent, but not returning any text. I can't use 'try', because it's not a Python error. python bash error-handling system subprocess share|improve this question edited Dec 21 '11 at 16:34 EOL 39.6k21124181 http://stackoverflow.com/questions/8592762/python-os-system-without-return-or-error asked Dec 21 '11 at 16:05 tkbx 2,987164385 7 os.system() is deprecated. Use the subprocess library instead. –Spencer Rathbun Dec 21 '11 at 16:08 add a comment| 2 Answers 2 active oldest votes up vote 3 down vote accepted You could redirect the command's standard error away from the terminal. For example: # without redirect In [2]: os.system('ls xyz') ls: cannot access xyz: No such file or directory Out[2]: 512 # with redirect In [3]: os.system('ls xyz 2> /dev/null') Out[3]: 512 P.S. As pointed out by @Spencer Rathbun, the subprocess module should be preferred over os.system(). Among other things, it gives you direct control over the subprocess's stdout and stderr. share|improve this answer answered Dec 21 '11 at 16:07 NPE 255k36556746 so just add "2> /dev/null" after the command? –tkbx Dec 21 '11 at 16:10 2 @lucase.62 no- Use subprocess.Popen –tMC Dec 21 '11 at 16:26 add a comment| up vote 2 down vote The recommended way to call a subprocess and manipulate its standard output and standard error is to use the subprocess module. Here is how you can suppress both the standard output and the standard output: import subprocess # New process, connected to the Python interpreter through pipes: prog = subprocess.Popen('ls', stdout=subprocess.PIPE, stderr=subprocess.PIPE) prog.communicate() # Returns (stdoutd
you have probably seen some. There are (at least) two distinguishable kinds of errors: syntax errors and exceptions. https://docs.python.org/3/tutorial/errors.html 8.1. Syntax Errors¶ Syntax errors, also known as parsing errors, are https://www.postgresql.org/message-id/1B6B036445BFC94490C87AF12F102AD3144DC4@tofn-svr-exc-01.yak.ca perhaps the most common kind of complaint you get while you are still learning Python: >>> while True print('Hello world') File "
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