Capturing errors raised by other scripts ?
I'm using the subroutine module to run run python script A.py from B.py (this is on windows fwiw). A.py is not my script and it may raise arbitary errors before exiting. How can I determine what's happened before A.py exited ? To simulate this I've got this script (which is meant to simulate A.py): class customError(Exception): def __init__(self, value): self.value = value def __str__(self): return repr(self.value) try: raise customError(2*2) except customError as e: print 'Custom exception occurred, value:', e.value I then run my A.py like this : fdOut, fOut = tempfile.mkstemp(suffix='.txt', prefix='AOut-') fdErr, fErr = tempfile.mkstemp(suffix='.txt', prefix='AErr-') try: ... pathtojob=python.exe A.py ... p = subprocess.Popen(pathtojob, stderr=fdErr, stdout=fdOut) ... except: ... print bad stuff happened ... When I do this I the exception handler is not fired and the text Custom exception occurred, value: 4 ends up in the stdout file. I'd really like it to end up in stderr because then I could say anything in stderr ? then ignore the output and flag an error. I don't want to have to parse the stdout for error like messages and I can't make changes to A.py. I'm sure there's a better way to do this - can anyone offer some advice ? thanks Richard. -- http://mail.python.org/mailman/listinfo/python-list
Re: Capturing errors raised by other scripts ?
On Feb 20, 4:13 pm, MRAB pyt...@mrabarnett.plus.com wrote: northof40 wrote: I'm using the subroutine module to run run python script A.py from B.py (this is on windows fwiw). A.py is not my script and it may raise arbitary errors before exiting. How can I determine what's happened before A.py exited ? To simulate this I've got this script (which is meant to simulate A.py): class customError(Exception): def __init__(self, value): self.value = value def __str__(self): return repr(self.value) try: raise customError(2*2) except customError as e: print 'Custom exception occurred, value:', e.value I then run my A.py like this : fdOut, fOut = tempfile.mkstemp(suffix='.txt', prefix='AOut-') fdErr, fErr = tempfile.mkstemp(suffix='.txt', prefix='AErr-') try: ... pathtojob=python.exe A.py ... p = subprocess.Popen(pathtojob, stderr=fdErr, stdout=fdOut) ... except: ... print bad stuff happened ... When I do this I the exception handler is not fired and the text Custom exception occurred, value: 4 ends up in the stdout file. I'd really like it to end up in stderr because then I could say anything in stderr ? then ignore the output and flag an error. I don't want to have to parse the stdout for error like messages and I can't make changes to A.py. I'm sure there's a better way to do this - can anyone offer some advice ? thanks A.py is printing the error message. The 'print' statement prints to stdout unless you direct it elsewhere with '', for example: print my_file, 'message' If you don't want error messages to go to stdout, then don't print them to stdout, it's as simple as that! Thanks for your reply. I take your point about print - perhaps I hadn't really thought that through. Unfortunately I don't have control of the real script that's being run so if the programmer of that script has used print there's nothing I can do about it. Perhaps I could modify the question. If A.py terminates due an unhandled exception is there anyway for B.py to know that's happened (without A.py's cooperation ?). thanks Richard. If A.py terminates due to an unhandled exception -- http://mail.python.org/mailman/listinfo/python-list
Re: How to timeout when waiting for raw_input from user ?
On Dec 5, 2:44 pm, Maxim Khitrov mkhit...@gmail.com wrote:
On Fri, Dec 4, 2009 at 6:55 PM, northof40 shearich...@gmail.com wrote:
On Dec 5, 12:52 pm, northof40 shearich...@gmail.com wrote:
Hi - I'm writing a *very* simple program for my kids. It asks the user
to give it the answer to a maths question and says right or wrong
They now want a timed version where they would only get so long to
respond to the question.
I'm thinking of some logic where a raw_input call is executed and then
if more than X seconds elapses before the prompt is replied to the
process writes a message Sorry too slow (or similar).
I can't see the wood for the trees here - what's the best way to do
this given the rather simple environment it's needed within.
Regards
richard.
Sorry I should said that based upon other answers I've seen to similar
questions this needs to run on a windows machine (other answers
suggest this is more difficult than running on *nix)
Simplest solution I could come up with. This is indeed much easier on
*nix (just use select.select on sys.stdin with a timeout).
---
from msvcrt import getch, kbhit, putch
from time import sleep, time
ans = ''
end = time() + 5
print('2 + 2 = ?')
while True:
while time() end:
if kbhit():
break
else:
sleep(0.001)
else:
ans = None
break
char = getch()
if char == '\r':
print('')
break
ans += char
putch(char)
if ans is None:
print('\nSorry too slow')
else:
try:
print('right' if int(ans) == 4 else 'wrong')
except:
print('not a number')
---
- Max
That's really great - thanks. I've never looked at the whole msvcrt
module before - it looks like it could be useful ... at least for
windows programmes.
Thanks again.
R.
--
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Re: How to timeout when waiting for raw_input from user ?
On Dec 5, 6:23 pm, Paul Rubin no.em...@nospam.invalid wrote: northof40 shearich...@gmail.com writes: I'm thinking of some logic where a raw_input call is executed and then if more than X seconds elapses before the prompt is replied to the process writes a message Sorry too slow (or similar). The simplest way to do this is with the alarm function and a signal handler. See the docs for the signal module. Hi Paul - Thanks for your reply. Unfortunately it seems like the bit of the signal module I would need for this is not implemented for windows (AttributeError: 'module' object has no attribute 'SIGALRM'). Still no matter when I asked the question I couldn't even figure out what module might provide this functionality for any platform so it was useful knowledge for the future. Thanks again. regards Richard. -- http://mail.python.org/mailman/listinfo/python-list
How to timeout when waiting for raw_input from user ?
Hi - I'm writing a *very* simple program for my kids. It asks the user to give it the answer to a maths question and says right or wrong They now want a timed version where they would only get so long to respond to the question. I'm thinking of some logic where a raw_input call is executed and then if more than X seconds elapses before the prompt is replied to the process writes a message Sorry too slow (or similar). I can't see the wood for the trees here - what's the best way to do this given the rather simple environment it's needed within. Regards richard. -- http://mail.python.org/mailman/listinfo/python-list
Re: How to timeout when waiting for raw_input from user ?
On Dec 5, 12:52 pm, northof40 shearich...@gmail.com wrote: Hi - I'm writing a *very* simple program for my kids. It asks the user to give it the answer to a maths question and says right or wrong They now want a timed version where they would only get so long to respond to the question. I'm thinking of some logic where a raw_input call is executed and then if more than X seconds elapses before the prompt is replied to the process writes a message Sorry too slow (or similar). I can't see the wood for the trees here - what's the best way to do this given the rather simple environment it's needed within. Regards richard. Sorry I should said that based upon other answers I've seen to similar questions this needs to run on a windows machine (other answers suggest this is more difficult than running on *nix) -- http://mail.python.org/mailman/listinfo/python-list
What file is foo in package bar in ?
Hi - I think this is a pretty basic question but it's never worried me before. To improve my skills I'm reading the source code of a library written by someone else. I've come across a problem doing that. Commonly a function is called like this: thepackage.theclass.foo The problem is that 'theclass' is implemented in a file called nothingliketheclass.py so finding the implemention of foo is a bit boring. Now I can grep for foo and depending on how common the method name is that helps ... or not but I'm sure there must be a better way. Given an arbitary package is there some programmatic way to 'ask' what file the method/function is implemented in ? thanks R. -- http://mail.python.org/mailman/listinfo/python-list
Re: What file is foo in package bar in ?
On Aug 20, 11:06 am, Christian Heimes li...@cheimes.de wrote: northof40 wrote: Given an arbitary package is there some programmatic way to 'ask' what file the method/function is implemented in ? Indeed, the inspect module contains several useful functions for the job, for examplehttp://docs.python.org/library/inspect.html#inspect.getfile Christian That's really great thanks - just what I was after. regards R. -- http://mail.python.org/mailman/listinfo/python-list
Python 2.6 in shared/VPS environment
Hi - I'd really like to have access to Python 2.6 to try something out. It needs to be on Linux/Unix machine. I don't mind paying but whichever way I turn I find Python 2.4 is the standard installation. Anyone know of anyone who offers this out of the box ? Or got any smart way of achieving it ? thanks R. -- http://mail.python.org/mailman/listinfo/python-list
Re: Python 2.6 in shared/VPS environment
Ignore this question. Managed to get Amazon Web Services going and have installed Python 2.6 on there. Thanks for your eyeballs time. On Jul 31, 7:09 pm, northof40 shearich...@gmail.com wrote: Hi - I'd really like to have access to Python 2.6 to try something out. It needs to be on Linux/Unix machine. I don't mind paying but whichever way I turn I find Python 2.4 is the standard installation. Anyone know of anyone who offers this out of the box ? Or got any smart way of achieving it ? thanks R. -- http://mail.python.org/mailman/listinfo/python-list
