Evan Adler wrote:
> I would like to submit the following proposal. In the logging module, I
> would like handlers (like file handlers and stream handlers) to have a
> field for exc_info printing. This way, a call to logger.exception() will
> write the stack trace to the handlers with this flag set, and only print
> the message and other info to handlers without the flag set. This allows a
> single logger to write to a less detailed console output, a less detailed
> run log, and a more detailed error log.
If I understand you correctly this would go into the Formatter rather than
the Handler. E. g.:
$ cat log_exception_format.py
import logging
import sys
class MyFormatter(logging.Formatter):
def __init__(self, fmt=None, datefmt=None, style='%', verbose=0):
super().__init__(fmt, datefmt, style)
self.verbose = verbose
def formatException(self, ei):
if self.verbose < 1:
return ""
elif self.verbose < 2:
return "{0[0].__name__}: {0[1]}".format(ei)
else:
return super().formatException(ei)
formatter = MyFormatter(logging.BASIC_FORMAT, verbose=sys.argv.count("-v"))
handler = logging.StreamHandler()
handler.setFormatter(formatter)
g = logging.getLogger()
g.addHandler(handler)
def f(n):
if n > 0:
return f(n-1)
else:
1/0
try:
f(3)
except:
g.exception("foo")
$ python3 log_exception_format.py
ERROR:root:foo
$ python3 log_exception_format.py -v
ERROR:root:foo
ZeroDivisionError: division by zero
$ python3 log_exception_format.py -v -v
ERROR:root:foo
Traceback (most recent call last):
File "log_exception_format.py", line 31, in <module>
f(3)
File "log_exception_format.py", line 27, in f
return f(n-1)
File "log_exception_format.py", line 27, in f
return f(n-1)
File "log_exception_format.py", line 27, in f
return f(n-1)
File "log_exception_format.py", line 29, in f
1/0
ZeroDivisionError: division by zero
$
(Note that this is just a sketch; for the above to work reliably the
format() method has to be changed to avoid caching the result of the
formatException() call)
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