On 11/12/05, Fredrik Lundh <[EMAIL PROTECTED]> wrote:
[EMAIL PROTECTED] wrote:
> Fairly new to python. In a try except how do you display the true
> (raw) error message so it can be displayed back to the user?
assuming that "true" means "the message you would get if you hadn't
used a try/except", the traceback module is what you want:
import traceback
try:
raise SyntaxError("example")
except:
traceback.print_exc()
prints
Traceback (innermost last):
File "module.py", line 4, in ?
SyntaxError: example
more here:
http://effbot.org/librarybook/traceback.htm
you can also inspect the exception status via the sys.exc_info() call.
e.g.
import sys
try:
1/0
except:
print "%s: %s" % sys.exc_info()[:2]
prints
exceptions.ZeroDivisionError: integer division or modulo by zero
Or you can combine both, I find these 3 lines after the except most helpful during developement stages and liberally splatter them around prototype code
>>> import sys, traceback
>>> try:
... 1/0
... except:
... print sys.exc_info()[0]
... print sys.exc_info()[1]
... print "LINE=",traceback.tb_lineno(sys.exc_info()[2])
...
exceptions.ZeroDivisionError
integer division or modulo by zero
LINE= 2
>>>
HTH :)
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