rootpy.logger
: Logging¶
rootpy
overrides the default logging class, inserting a check that
there exists a default logging handler. If there is not, it adds one.
In additon, this can be used to intercept ROOT’s log messages and redirect them through python’s logging subsystem
Example use:
# Disable colored logging (not needed if writing into a file,
# this is automatic).
# Must be done before :py:mod:`rootpy` logs any messages.
import logging; logging.basicConfig(level=logging.DEBUG)
from rootpy import log; log = log["/myapp"]
log.debug("Hello") # Results in "DEBUG:myapp] Hello"
# Suppress all myapp debug and info messages
log.setLevel(log.WARNING)
log.debug("Hello") # No effect
mymod = log["mymod"]
mymod.warning("Hello") # Results in "WARNING:myapp.mymod] Hello"
# Suppress all rootpy debug and info messages
log["/rootpy"].setLevel(log.WARNING)
# Suppress messages coming from TCanvas like
# INFO:ROOT.TCanvas.Print] png file /path/to/file.png has been created
log["/ROOT.TCanvas.Print"].setLevel(log.WARNING)
# Suppress warning messages coming the ``TClass`` constructor:
log["/ROOT.TClass.TClass"].setLevel(log.ERROR)
# Precisely remove messages containing the text "no dictionary for class"
# (doesn't work when attached to parent logger)
import logging
class NoDictMessagesFilter(logging.Filter):
def filter(self, record):
return "no dictionary for class" not in record.msg
log["/ROOT.TClass.TClass"].addFilter(NoDictMessagesFilter())
# Turn ROOT errors into exceptions
from rootpy.logger.magic import DANGER
DANGER.enable = True
import ROOT
ROOT.Error("test", "Test fatal")
# Result:
# ERROR:ROOT.test] Test fatal
# Traceback (most recent call last):
# File "test.py", line 36, in <module>
# ROOT.Fatal("test", "Test fatal")
# File "test.py", line 36, in <module>
# ROOT.Fatal("test", "Test fatal")
# File "rootpy/logger/roothandler.py", line 40, in python_logging_error_handler
# raise ROOTError(level, location, msg)
# rootpy.ROOTError: level=6000, loc='test', msg='Test fatal'
# Primitive function tracing:
@log.trace()
def salut():
return
@log.trace()
def hello(what):
salut()
return "42"
hello("world")
# Result:
# DEBUG:myapp.trace.hello] > ('world',) {}
# DEBUG:myapp.trace.salut] > () {}
# DEBUG:myapp.trace.salut] < return None [0.00 sec]
# DEBUG:myapp.trace.hello] < return 42 [0.00 sec]
Classes¶
logger.LogFilter (logger, message_regex) |
Functions¶
logger.log_trace (logger[, level, …]) |
log a statement on function entry and exit |