Automatic Logging

[daftspaniel]

Sorry if this is a FAQ but Google returns a *lot* of results for Python
Logging :-)

I am looking for a tool that will automatically add logging to existing
code e.g. Function Entries and Exits, Return values etc.

Thanks,
Davy Mitchell

Mood News
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[Peter Hansen]

da*********@gma il.com wrote:

Sorry if this is a FAQ but Google returns a *lot* of results for Python
Logging :-)

I am looking for a tool that will automatically add logging to existing
code e.g. Function Entries and Exits, Return values etc.

Perhaps you are looking for nothing more than this standard function:

help(sys.settra ce)

Help on built-in function settrace in module sys:

settrace(...)
settrace(functi on)

Set the global debug tracing function. It will be called on each
function call. See the debugger chapter in the library manual.
Combine that with the standard library "logging" package and it meets
your specs as stated above.

-Peter

[Gregory Petrosyan]

My decorator bike:
import logging
import traceback

logging.basicCo nfig(level=logg ing.DEBUG,
format="%(ascti me)s %(levelname)s:\ n%(message)s\n" ,
filename="/tmp/py.log",
filemode='w')

def log(f):
def new_f(*args, **kwds):
try:
indent = len("(in '%s') %s(" % (f.__module__,
f.func_name))
nice_args = [repr(a) for a in args]
nice_args = (',\n'+' '*indent).join( nice_args)
nice_kwds = [str(a) + ' = ' + repr(b) for a,b in
kwds.items()]
if nice_kwds:
nice_kwds[0] = ' '*indent + nice_kwds[0]
nice_kwds = (',\n'+' '*indent).join( nice_kwds)
nice_args = nice_args + ',\n' + nice_kwds
else:
nice_args = nice_args + ', {}'
logging.info("( in '%s') %s(%s) starts" % \
(f.__module__, f.func_name, nice_args))
result = f(*args, **kwds)
except:

logging.error(' \n'.join(traceb ack.format_exc( ).split('\n')[1:])[:-1])
raise
return result
new_f.func_name = f.func_name
return new_f

[Gregory Petrosyan]

Sorry for broken indentation.

[daftspaniel]

Thanks very much.

I found a good example of using sys.settrace at
http://effbot.org/librarybook/sys.htm

Cheers,
Davy Mitchell

Mood News
- BBC News Headlines Auto-Classified as Good, Bad or Neutral.
http://www.latedecember.com/sites/moodnews/