Hide traceback unless a debug flag is set
Solution 1
The short way is using the sys
module and use this command:
sys.tracebacklimit = 0
Use your flag to determine the behaviour.
Example:
>>> import sys
>>> sys.tracebacklimit=0
>>> int('a')
ValueError: invalid literal for int() with base 10: 'a'
The nicer way is to use and exception hook:
def exception_handler(exception_type, exception, traceback):
# All your trace are belong to us!
# your format
print "%s: %s" % (exception_type.__name__, exception)
sys.excepthook = exception_handler
Edit:
If you still need the option of falling back to the original hook:
def exception_handler(exception_type, exception, traceback, debug_hook=sys.excepthook):
if _your_debug_flag_here:
debug_hook(exception_type, exception, traceback)
else:
print "%s: %s" % (exception_type.__name__, exception)
Now you can pass a debug hook to the handler, but you'll most likely want to always use the one originated in sys.excepthook
(so pass nothing in debug_hook
). Python binds default arguments once in definition time (common pitfall...) which makes this always work with the same original handler, before replaced.
Solution 2
try:
pass # Your code here
except Exception as e:
if debug:
raise # re-raise the exception
# traceback gets printed
else:
print("{}: {}".format(type(e).__name__, e))
matt wilkie
hewer of maps, old time techie, newbie developer personal - www.maphew.com, @maphew in-between - yukongis.ca work - www.env.gov.yk.ca, @mhw-at-yg
Updated on July 08, 2022Comments
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matt wilkie almost 2 years
What is the idiomatic python way to hide traceback errors unless a verbose or debug flag is set?
Example code:
their_md5 = 'c38f03d2b7160f891fc36ec776ca4685' my_md5 = 'c64e53bbb108a1c65e31eb4d1bb8e3b7' if their_md5 != my_md5: raise ValueError('md5 sum does not match!')
Existing output now, but only desired when called with
foo.py --debug
:Traceback (most recent call last): File "b:\code\apt\apt.py", line 1647, in <module> __main__.__dict__[command] (packages) File "b:\code\apt\apt.py", line 399, in md5 raise ValueError('md5 sum does not match!') ValueError: md5 sum does not match!
Desired normal output:
ValueError: md5 sum does not match!
Here's a test script: https://gist.github.com/maphew/e3a75c147cca98019cd8